Filling an object ArrayList from a text file
Hi all,
I am developing a project (for university) which has a class named "SupplierAgent", which is required to keep database of custom objects of type "InventoryItem". Basically these consist of a String (for the name of the item), an int representing the quantity on hand, and an int representing the unit price (in cents). I wish to have this inventory loaded from a text file rather than a binary file - that way the user can add new items to the file before loading the agent.
I have included the code below, which works provided the file is rigidly structured. The main problem is the user having to type the path to the file: I cannot guarantee the user will have the file in any folder, and so the user is required to type in the absolute path. Is there any way to make this less annoying? Or is there a better way of loading a preset inventory while allowing the user to edit that inventory at will?
I have included the current code below. it's not exactly in accordance with coding standards, because we are using the JADE agent architecture (hence why the method is called "action") rather than something more informative.
I should also mention that it uses a command line interface. The "io" class basically includes a scanner and the System.out.println method. Its "yesOrNo()" method is for convenience: it asks the user a question and allows them to select y or n.
public void action() {
boolean loadFromFile = io.yesOrNo("Would you like to load the inventory from a file?");
if(loadFromFile) {
BufferedReader br = null;
boolean fileFound = false;
while(!fileFound) {
io.output("Please enter the absolute path to the file, including filename extension: ");
inventoryFile = io.input();
try {
FileReader fr = new FileReader(inventoryFile);
br = new BufferedReader(fr);
fileFound = true;
catch (FileNotFoundException e) {
io.output("File not found. ");
String fileLine = null;
int lineNumber = 1;
InventoryItem item = null;
try {
while((fileLine = br.readLine()) != null) {
switch((lineNumber % 4)) {
case 1: item = new InventoryItem();
item.setName(fileLine); break;
case 2: item.setQuantity(Integer.parseInt(fileLine));
case 3: item.setPrice(Integer.parseInt(fileLine));
case 0: inventory.add(item);
io.output("Inventory loaded successfully\n");
catch(Exception e) {
io.output("Error at line " + lineNumber + " of inventory file\n");
io.output("Unable to fill inventory. Please ensure file is structured correctly\n");
io.output("See readme for explanation of file structure requirements\n");
myAgent.doDelete();
}Edited by: Swiftslide on Apr 22, 2010 6:34 PM
You can use JFileChooser to allow the user to navigate to the required file.
Similar Messages
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How to input data into an arraylist from a text file?
I am trying to take data from a text file and put that data into an arraylist. First here is the text file:
[item1, 10, 125.0, item2, 10, 12.0, item3, 20, 158.0]
3
4530.0
[item5, 65, 555.5, item4, 29, 689.0]
2
56088.5
[item7, 84, 34.5, item6, 103, 0.5, item8, 85, 1.36]
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3065.1The text between the [ ] is the output from my arraylists. I have three arraylists. The first [ ] belongs to arraylist A, the second to arraylist B, and the third to arraylist C. The format of the arraylists is this:
<item name>,<# in stock>,<value of one item>
The first number below the arraylists in the text file represents the number of items in the list. The second number below the arraylists represents the total value of the items in the arraylists.
Here is the class file I have (yes, it does everything):
import java.io.*;
import java.util.Scanner;
import java.util.ArrayList;
public class Inventory extends Object
public int toAdd = 0;
private boolean done = false; //Are we done yet?
public String strItemName; //The name of the item type.
public int intNumInStock; //The number in stock of that type.
public double dblValueOfOneItem; //The value of one item.
public String strNumberInStock;
public double dblTotalValueA; //The total value of warehouse A.
public double dblTotalValueB; //The total value of warehouse B.
public double dblTotalValueC; //The total value of warehouse C.
public int intWarehouseAItemCount; //Counter for items in warehouse A.
public int intWarehouseBItemCount; //Counter for items in warehouse B.
public int intWarehouseCItemCount; //Counter for items in warehouse C.
ArrayList warehouseAList = new ArrayList(); //Create the Warehouse A ArrayList.
ArrayList warehouseBList = new ArrayList(); //Create the Warehouse B arrayList.
ArrayList warehouseCList = new ArrayList(); //Create the Warehouse C arrayList.
/** Construct a new Inventory object. */
public Inventory()
super();
/**Add items to the Warehouse A ArrayList.*/
private void createWareHouseA()
System.out.println("!" + toAdd + " item types will be added to warehouse A.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseAList : " +
warehouseAList.size());
//Add items to the array List
warehouseAList.add(this.strItemName);
warehouseAList.add(this.strNumberInStock);
warehouseAList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseAList.size());
/**Add items to the Warehouse B ArrayList.*/
private void createWareHouseB()
System.out.println("!" + toAdd + " item types will be added to warehouse B.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseBList : " +
warehouseBList.size());
//Add items to the array List
warehouseBList.add(this.strItemName);
warehouseBList.add(this.strNumberInStock);
warehouseBList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseBList.size());
/**Add items to the Warehouse C ArrayList.*/
private void createWareHouseC()
System.out.println("!" + toAdd + " item types will be added to warehouse C.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseCList : " +
warehouseCList.size());
//Add items to the array List
warehouseCList.add(this.strItemName);
warehouseCList.add(this.strNumberInStock);
warehouseCList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseCList.size());
/**Interpret the commands entered by the user.*/
public void cmdInterpreter()
this.displayHelp();
Scanner cin = new Scanner(System.in);
while (!this.done)
System.out.print(">");
//"line" equals the next line of input.
String line = cin.nextLine();
this.executeCmd(line);
/**Execute one line entered by the user.
* @param cmdLN; The command entered by the user to execute. */
private void executeCmd(String cmdLN)
Scanner line = new Scanner(cmdLN);
if (line.hasNext())
String cmd = line.next();
//What to do when users enter the various commands below.
if (cmd.equals("help"))
this.displayHelp();
else if (cmd.equals("Q!"))
this.done = true;
else if (cmd.equals("F") && line.hasNext())
this.inputFromFile(line.next());
else if (cmd.equals("K") && line.hasNext())
int numItemsToAdd = Integer.valueOf( line.next() ).intValue();
this.toAdd = numItemsToAdd;
this.inputFromKeyboard(numItemsToAdd);
/**What to do if input comes from a file.
* @param inputFile; The name of the input file to process.*/
private void inputFromFile(String inputFile)
Scanner cin = new Scanner(System.in);
System.out.println("!Using input file " + inputFile + ".");
System.out.print("!Enter the name of the output file: ");
String outputFile = cin.next();
System.out.println("!Using output file " + outputFile + ".");
try
BufferedReader in = new BufferedReader(new FileReader(inputFile));
//Scanner in = new Scanner(new File(inputFile));
//Initialize the String variables.
String line1 = null;
String line2 = null;
String line3 = null;
String line4 = null;
String line5 = null;
String line6 = null;
String line7 = null;
String line8 = null;
String line9 = null;
System.out.println(in.equals(",") + " see?");
//System.out.println((char)(char)in.read() + " experiment");
/**This loop assigns values to the string variables based on the
* values on each line in the input file. */
while(in.readLine() != null)
line1 = in.readLine();
line2 = in.readLine();
line3 = in.readLine();
line4 = in.readLine();
line5 = in.readLine();
line6 = in.readLine();
line7 = in.readLine();
line8 = in.readLine();
line9 = in.readLine();
//Print the contents of each line in the input file.
System.out.println("!value of line 1: " + line1);
System.out.println("!value of line 2: " + line2);
System.out.println("!value of line 3: " + line3);
System.out.println("!value of line 4: " + line4);
System.out.println("!value of line 5: " + line5);
System.out.println("!value of line 6: " + line6);
System.out.println("!value of line 7: " + line7);
System.out.println("!value of line 8: " + line8);
System.out.println("!value of line 9: " + line9);
/**Add items to the warehouses.*/
warehouseAList.add(line1);
warehouseBList.add(line4);
warehouseCList.add(line7);
/**Add the item count and total value for warehouse A.*/
int intLine2 = Integer.valueOf(line2).intValue();
this.intWarehouseAItemCount = intLine2;
double dblLine3 = Double.valueOf(line3).doubleValue();
this.dblTotalValueA = dblLine3;
/**Add the item count and total value for warehouse B.*/
int intLine5 = Integer.valueOf(line5).intValue();
this.intWarehouseBItemCount = intLine5;
double dblLine6 = Double.valueOf(line6).doubleValue();
this.dblTotalValueB = dblLine6;
/**Add the item count and total value for warehouse C.*/
int intLine8 = Integer.valueOf(line8).intValue();
this.intWarehouseCItemCount = intLine8;
double dblLine9 = Double.valueOf(line9).doubleValue();
this.dblTotalValueC = dblLine9;
/**Ask the user how many items to add or delete from inventory.*/
System.out.print("Enter the number to add to inventory for " +
warehouseAList.get(0) + ":");
String toAddOrDel = cin.next();
/**Print the contents of all the warehouses. */
System.out.println(" ");
//Print the contents of warehouse A.
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse A:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse A.
System.out.println(warehouseAList);
//Print the total amount of items in warehouse A.
System.out.println("Total items: " + this.intWarehouseAItemCount);
//Print the total value of the items in warehouse A.
System.out.println("Total value: " + this.dblTotalValueA);
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse B:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse B.
System.out.println("!warehouseB: " + warehouseBList);
//Print the total amount of items in warehouse B.
System.out.println("Total items: " + this.intWarehouseBItemCount);
//Print the total value of the items in warehouse B.
System.out.println("Total value: " + this.dblTotalValueB);
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse C:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse C.
System.out.println("!warehouseC: " + warehouseCList);
//Print the total amount of items in warehouse C.
System.out.println("Total items: " + this.intWarehouseCItemCount);
//Print the total value of the items in warehouse C.
System.out.println("Total value: " + this.dblTotalValueC);
in.close();
catch (FileNotFoundException e)
System.out.println("!Error: Unable to open file for reading.");
catch (EOFException e)
System.out.println("!Error: EOF encountered, file may be corrupted.");
catch (IOException e)
System.out.println("!Error: Cannot read from file.");
/**What to do if input comes from the keyboard.
* @param numItems; The total number of items that will be added to the
* Warehouse(s). */
public void inputFromKeyboard(int numItems)
System.out.println("!You will be adding " + numItems + " items to " +
"inventory from the keyboard. ");
this.toAdd = numItems;
Scanner cin = new Scanner(System.in);
//Prompt user for name of output file.
System.out.print("!Enter the name of the output file: ");
String outputFile = cin.next();
/**This loop asks the user for information about the item(s) and inputs
*them into the appropriate array.*/
int count = 0;
while (numItems > count)
//Item name.
System.out.print("!Item name: ");
String addItemName = cin.next();
//Number in stock.
System.out.print("!Number in stock: ");
String addNumInStock = cin.next();
//Initial warehouse.
System.out.print("!Initial warehouse(A,B,C): ");
String addInitWarehouse = cin.next();
//Value of one item.
System.out.print("!Value of one item: ");
String addValueOfOneItem = cin.next();
//Add or delete from inventory
System.out.print("!Enter amount to add or delete from inventory: ");
String strAddOrDelete = cin.next();
System.out.println("!Amount to add or delete: " + strAddOrDelete);
//Cast
int intAddNumInStock = Integer.valueOf(addNumInStock).intValue();
double doubleAddValueOfOneItem = Double.valueOf(addValueOfOneItem).doubleValue();
int intAddOrDelete = Integer.valueOf(strAddOrDelete).intValue();
/**Add intAddNumInStock with intAddOrDelete to determine the amount
* to add or delete from inventory (If a user wishes to remove items
* from inventory simply add negative values). */
intAddNumInStock = intAddNumInStock + intAddOrDelete;
System.out.println("!Inventory after modifications: " + strAddOrDelete);
this.strItemName = addItemName;
this.intNumInStock = intAddNumInStock;
this.dblValueOfOneItem = doubleAddValueOfOneItem;
//Put items into warehouse A if appropriate.
if (intAddNumInStock < 25)
//Increment the warehouse A item count.
this.intWarehouseAItemCount = this.intWarehouseAItemCount + 1;
//Calculate the total value of warehouse A.
this.dblTotalValueA = this.dblTotalValueA + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse A array list.
this.createWareHouseA();
//Put items into warehouse B if appropriate.
if (intAddNumInStock >= 25)
if (intAddNumInStock < 75)
//Increment the warehouse B item count.
this.intWarehouseBItemCount = this.intWarehouseBItemCount + 1;
//Calculate the total value of warehouse B.
this.dblTotalValueB = this.dblTotalValueB + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse B array list.
this.createWareHouseB();
//Put items into warehouse C if appropriate.
if (intAddNumInStock >= 75)
//Increment the warehouse C item count.
this.intWarehouseCItemCount = this.intWarehouseCItemCount + 1;
//Calculate the total value of warehouse C.
this.dblTotalValueC = this.dblTotalValueC + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse C array list.
this.createWareHouseC();
//display helpful information.
System.out.println("!--------------------------------");
System.out.println("!" + addItemName + " is the item name.");
System.out.println("!" + addNumInStock + " is the number in stock.");
System.out.println("!" + addInitWarehouse + " is the initial warehouse.");
System.out.println("!" + addValueOfOneItem + " is the value of one item.");
System.out.println("!--------------------------------------------------");
//Increment the counters.
count++;
/**Create and write to the output file. */
try
//Use the output file specified by the user.
PrintWriter out = new PrintWriter(outputFile);
/**Write warehouse A details.*/
//Blank the first line.
out.println(" ");
//Write the array list for warehouse A.
out.println(warehouseAList);
//Write the amount of items in warehouse A.
out.println(intWarehouseAItemCount);
//Write the total value for warehouse A.
out.println(dblTotalValueA);
/**Write warehosue B details.*/
//Write the array list for warehouse B.
out.println(warehouseBList);
//Write the amount of items in warehouse B.
out.println(intWarehouseBItemCount);
//Write the total value for warehouse B.
out.println(dblTotalValueB);
/**Write warehouse C details.*/
//Write the array list for warehouse C.
out.println(warehouseCList);
//Write the amount of items in warehouse C.
out.println(intWarehouseCItemCount);
//Write the total value for warehouse C.
out.println(dblTotalValueC);
//Close the output file.
out.close();
catch (FileNotFoundException e)
System.out.println("Error: Unable to open file for reading.");
catch (IOException e)
System.out.println("Error: Cannot read from file.");
/**View the contents and the value of each warehouse.*/
System.out.println("!---------------Inventory Summary------------------");
System.out.println("!--------------------------------------------------");
System.out.println("!--------------------LEGEND:-----------------------");
System.out.println("!<item type>, <amount in stock>,<value of one item>");
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse A:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse A.
System.out.println(warehouseAList);
//Total items in warehouse A.
System.out.println("Total items: " + intWarehouseAItemCount);
//Display total value of warehouse A.
System.out.println("Total value: " + "$" + dblTotalValueA);
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse B:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse B.
System.out.println(warehouseBList);
//Total items in warehouse B.
System.out.println("Total items: " + intWarehouseBItemCount);
//Display total value of warehouse B.
System.out.println("Total value: " + "$" + dblTotalValueB);
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse C:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse C.
System.out.println(warehouseCList);
//Total items in warehouse C.
System.out.println("Total items: " + intWarehouseCItemCount);
//Display total value of warehouse C.
System.out.println("Total value: " + "$" + dblTotalValueC);
/**Display a help message.*/
private void displayHelp()
System.out.println("!--------------------------------");
System.out.println("! General Help:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'help' display this help message.");
System.out.println("!'Q!' quit this program.");
System.out.println("!--------------------------------");
System.out.println("! Input File Specific Commands:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'F' <name> type F followed by the name of the " +
"file to be used for input.");
System.out.println("!---------------------------------------");
System.out.println("! Input From Keyboard Specific Commands:");
System.out.println("!---------------------------------------");
System.out.println("! ");
System.out.println("!'K' <number> type K followed by the number of " +
"items that will be added. ");
System.out.println("! ");
}Program file:
public class InventoryProg
public static void main(String[] args)
//Create a new Inventory object.
Inventory test = new Inventory();
//Execute the command interpreter.
test.cmdInterpreter();
}Right now I am stuck on this and I cannot progress any further until I figure out how to input the data in the text file back into a arraylist.
Thanks in advance.Thanks but I figured it out. Heres a sample of the code i used to solve my problem:
try
//Warehouse A BufferedReader.
BufferedReader inA = new BufferedReader(new FileReader(inputFileWarehouseA));
//Warehouse B BufferedReader.
BufferedReader inB = new BufferedReader(new FileReader(inputFileWarehouseB));
//Warehouse C BufferedReader.
BufferedReader inC = new BufferedReader(new FileReader(inputFileWarehouseC));
//Warehouse details BufferedReader.
BufferedReader inDetails = new BufferedReader(new FileReader(inputFileDetails));
//Will hold values in warehouse arraylists.
String lineA = null;
String lineB = null;
String lineC = null;
//Will hold the details of each warehouse.
String line1 = null;
String line2 = null;
String line3 = null;
String line4 = null;
String line5 = null;
String line6 = null;
//Get the item count and total value for each warehouse.
while(inDetails.readLine() != null)
line1 = inDetails.readLine();
line2 = inDetails.readLine();
line3 = inDetails.readLine();
line4 = inDetails.readLine();
line5 = inDetails.readLine();
line6 = inDetails.readLine();
/**Assign the item count and total value to warehouse A.*/
//Cast.
int intLine1 = Integer.valueOf(line1).intValue();
double dblLine2 = Double.valueOf(line2).doubleValue();
//Assign the values.
this.intWarehouseAItemCount = intLine1;
this.dblTotalValueA = dblLine2;
/**Assign the item count and total value to warehouse B.*/
//Cast.
int intLine3 = Integer.valueOf(line3).intValue();
double dblLine4 = Double.valueOf(line4).doubleValue();
//Assign the values.
this.intWarehouseBItemCount = intLine3;
this.dblTotalValueB = dblLine4;
/**Assign the item count and total value to warehouse C.*/
//Cast.
int intLine5 = Integer.valueOf(line5).intValue();
double dblLine6 = Double.valueOf(line6).doubleValue();
//Assign the values.
this.intWarehouseCItemCount = intLine5;
this.dblTotalValueC = dblLine6;
/**Put the items back into the warehouses arraylists. */
//Add items to warehouse A.
while((lineA = inA.readLine()) != null)
warehouseAList.add(lineA);
//Add items to warehouse B.
while((lineB = inB.readLine()) != null)
warehouseBList.add(lineB);
//Add items to warehouse C.
while((lineC = inC.readLine()) != null)
warehouseCList.add(lineC);
}(this isn't the whole try statement its pretty long) -
Reading a Random Line from a Text File
Hello,
I have a program that reads from a text file words. I currently have a text file around 800KB of words. The problem is, if I try to load this into an arraylist so I can use it in my application, it takes wayy long to load. I was wondering if there was a way to just read a random line from the text file.
Here is my code, and the text file that the program reads from is called 'wordFile'
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class WordColor extends JFrame{
public WordColor(){
super("WordColor");
setSize(1000,500);
setVisible(true);
add(new WordPanel());
public static void main(String[]r){
JFrame f = new WordColor();
class WordPanel extends JPanel implements KeyListener{
private Graphics2D pane;
private Image img;
private char[]characterList;
private CharacterPosition[]positions;
private int charcounter = 0;
private String initialWord;
private File wordFile = new File("C:\\Documents and Settings\\My Documents\\Java\\projects\\WordColorWords.txt");
private FontMetrics fm;
private javax.swing.Timer timer;
public final static int START = 20;
public final static int delay = 10;
public final static int BOTTOMLINE = 375;
public final static int buffer = 15;
public final static int distance = 4;
public final static Color[] colors = new Color[]{Color.red,Color.blue,Color.green,Color.yellow,Color.cyan,
Color.magenta,Color.orange,Color.pink};
public static String[] words;
public static int descent;
public static int YAXIS = 75;
public static int SIZE = 72;
public WordPanel(){
words = readWords();
setLayout(new BorderLayout());
initialWord = getWord();
characterList = new char[initialWord.length()];
for (int i=0; i<initialWord.length();i++){
characterList[i] = initialWord.charAt(i);
setFocusable(true);
addKeyListener(this);
timer = new javax.swing.Timer(delay,new ActionListener(){
public void actionPerformed(ActionEvent evt){
YAXIS += 1;
drawWords();
if (YAXIS + descent - buffer >= BOTTOMLINE) lose();
if (allColorsOn()) win();
public void paintComponent(Graphics g){
super.paintComponent(g);
if (img == null){
img = createImage(getWidth(),getHeight());
pane = (Graphics2D)img.getGraphics();
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
pane.setFont(new Font("Arial",Font.BOLD,SIZE));
pane.setColor(Color.black);
drawThickLine(pane,getWidth(),5);
fm = g.getFontMetrics(new Font("Arial",Font.BOLD,SIZE));
descent = fm.getDescent();
distributePositions();
drawWords();
timer.start();
g.drawImage(img,0,0,this);
private void distributePositions(){
int xaxis = START;
positions = new CharacterPosition[characterList.length];
int counter = 0;
for (char c: characterList){
CharacterPosition cp = new CharacterPosition(c,xaxis, Color.black);
positions[counter] = cp;
counter++;
xaxis += fm.charWidth(c)+distance;
private void drawThickLine(Graphics2D pane, int width, int thickness){
pane.setColor(Color.black);
for (int j = BOTTOMLINE;j<BOTTOMLINE+1+thickness;j++){
pane.drawLine(0,j,width,j);
private void drawWords(){
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
drawThickLine(pane,getWidth(),5);
for (CharacterPosition cp: positions){
int x = cp.getX();
char print = cp.getChar();
pane.setColor(cp.getColor());
pane.drawString(""+print,x,YAXIS);
repaint();
private boolean allColorsOn(){
for (CharacterPosition cp: positions){
if (cp.getColor() == Color.black) return false;
return true;
private Color randomColor(){
int rand = (int)(Math.random()*colors.length);
return colors[rand];
private void restart(){
charcounter = 0;
for (CharacterPosition cp: positions){
cp.setColor(Color.black);
private void win(){
timer.stop();
newWord();
private void newWord(){
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
repaint();
drawThickLine(pane,getWidth(),5);
YAXIS = 75;
initialWord = getWord();
characterList = new char[initialWord.length()];
for (int i=0; i<initialWord.length();i++){
characterList[i] = initialWord.charAt(i);
distributePositions();
charcounter = 0;
drawWords();
timer.start();
private void lose(){
timer.stop();
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
pane.setColor(Color.red);
pane.drawString("Sorry, You Lose!",50,150);
repaint();
removeKeyListener(this);
final JPanel p1 = new JPanel();
JButton again = new JButton("Play Again?");
p1.add(again);
add(p1,"South");
p1.setBackground(Color.white);
validate();
again.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
remove(p1);
addKeyListener(WordPanel.this);
newWord();
private String getWord(){
int rand = (int)(Math.random()*words.length);
return words[rand];
private String[] readWords(){
ArrayList<String> arr = new ArrayList<String>();
try{
BufferedReader buff = new BufferedReader(new FileReader(wordFile));
try{
String line = null;
while (( line = buff.readLine()) != null){
line = line.toUpperCase();
arr.add(line);
finally{
buff.close();
catch(Exception e){e.printStackTrace();}
Object[] objects = arr.toArray();
String[] words = new String[objects.length];
int count = 0;
for (Object o: objects){
words[count] = (String)o;
count++;
return words;
public void keyPressed(KeyEvent evt){
char tempchar = evt.getKeyChar();
String character = ""+tempchar;
if (character.equalsIgnoreCase(""+positions[charcounter].getChar())){
positions[charcounter].setColor(randomColor());
charcounter++;
else if (evt.isShiftDown()){
evt.consume();
else{
restart();
drawWords();
public void keyTyped(KeyEvent evt){}
public void keyReleased(KeyEvent evt){}
class CharacterPosition{
private int xaxis;
private char character;
private Color color;
public CharacterPosition(char c, int x, Color col){
xaxis = x;
character = c;
color = col;
public int getX(){
return xaxis;
public char getChar(){
return character;
public Color getColor(){
return color;
public void setColor(Color c){
color = c;
}I thought that maybe serializing the ArrayList might be faster than creating the ArrayList by iterating over each line in the text file. But alas, I was wrong. Here's my code anyway:
class WordList extends ArrayList<String>{
long updated;
WordList readWordList(File file) throws Exception{
WordList list = new WordList();
BufferedReader in = new BufferedReader(new FileReader(file));
String line = null;
while ((line = in.readLine()) != null){
list.add(line);
in.close();
list.updated = file.lastModified();
return list;
WordList wordList;
File datFile = new File("words.dat");
File txtFile = new File("input.txt");
if (datFile.exists()){
ObjectInputStream input = new ObjectInputStream(new FileInputStream(datFile));
wordList = (WordList)input.readObject();
if (wordList.updated < txtFile.lastModified()){
//if the text file has been updated, re-read it
wordList = readWordList(txtFile);
ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(datFile));
output.writeObject(wordList);
output.close();
} else {
//serialized list does not exist--create it
wordList = readWordList(txtFile);
ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(datFile));
output.writeObject(wordList);
output.close();
}The text file contained one random sequence of letters per line. For example:
hwnuu
nhpgaucah
zfbylzt
hwnc
gicgwkhStats:
Text file size: 892K
Serialized file size: 1.1MB
Time to read from text file: 795ms
Time to read from serialized file: 1216ms -
At end of tether! Reading in variables from a text file
Hi all
My stress factor has gone through the roof because I am trying to read in from a text file (you may have seen some earlir questions about ArrayLists) it's just not working!
The code is below. The result is that it's reading in all of the car data, none of the motorbike and only the first line for the services. It's odd and it's driving me insane!
Here's an example of the data it's reading. There are about 7-10 sets of data per type
<car><reg>AB04CDE</reg><make>Ford</make><model>Fiesta</model><colour>blue</colour><passenger_no>4</passenger_no></car>
<service><service_no>13570</service_no><reg>J605PLE</reg><date>15:07:2006</date><miles>20000</miles><part_replaced>brake_pads</part_replaced><part_replaced>front_tyres</part_replaced></service>
<motorbike><reg>TT05EKJ</reg><make>Triumph</make><model>Speedmaster</model><colour>black</colour><load>20.50</load></motorbike>
Here's the code
while (moreToRead) {
String line;
try {
line = fileReader.getNextStructure();
// collect the data from the file
if (line.indexOf("<car>")> -1){
// Select/Extract the registration element
int nStart = line.indexOf("<reg>");
int nEnd = line.indexOf("</reg>");
String reg = line.substring(nStart+5,nEnd);
// Select/Extract the make element
nStart = line.indexOf("<make>");
nEnd = line.indexOf("</make>");
String make = line.substring(nStart+6,nEnd);
// Select/Extract the model element
nStart = line.indexOf("<model>");
nEnd = line.indexOf("</model>");
String model = line.substring(nStart+7,nEnd);
// Select/Extract the colour element
nStart = line.indexOf("<colour>");
nEnd = line.indexOf("</colour>");
String colour = line.substring(nStart+8,nEnd);
// Select/Extract the passenger_no element
nStart = line.indexOf("<passenger_no>");
nEnd = line.indexOf("</passenger_no>");
String passenger_no = line.substring(nStart+14,nEnd);
//convert string to int
int passengerInt = Integer.parseInt(passenger_no);
// declare new object car and assign the variables then add it to the array.
Car c = new Car (reg, make, model, colour, passengerInt);
carList.add(c);
} else if (line.indexOf("<bike>")> -1) {
// Select/Extract the registration element
int nStart = line.indexOf("<reg>");
int nEnd = line.indexOf("</reg>");
String reg = line.substring(nStart+5,nEnd);
// Select/Extract the make element
nStart = line.indexOf("<make>");
nEnd = line.indexOf("</make>");
String make = line.substring(nStart+6,nEnd);
// Select/Extract the model element
nStart = line.indexOf("<model>");
nEnd = line.indexOf("</model>");
String model = line.substring(nStart+7,nEnd);
// Select/Extract the colour element
nStart = line.indexOf("<colour>");
nEnd = line.indexOf("</colour>");
String colour = line.substring(nStart+8,nEnd);
// Select/Extract the load element
nStart = line.indexOf("<load>");
nEnd = line.indexOf("</load>");
String load = line.substring(nStart+6,nEnd);
//convert load string to double
double bikeLoad = Double.parseDouble(load);
// declare new object motorbike and assign the variables then add it to the array.
Motorbike m = new Motorbike (reg, make, model, colour, bikeLoad);
bikeList.add(m);
} else {
// Select/Extract the service_number element
int nStart = line.indexOf("<service_no>");
int nEnd = line.indexOf("</service_no>");
String service_no = line.substring(nStart+12,nEnd);
console.println("service = " + service_no);
nStart = line.indexOf("<reg>");
nEnd = line.indexOf("</reg>");
String reg = line.substring(nStart+5,nEnd);
console.println("service = " + reg);
nStart = line.indexOf("<date>");
nEnd = line.indexOf("</date>");
String date = line.substring(nStart+6,nEnd);
console.println("service = " + date);
nStart = line.indexOf("<miles>");
nEnd = line.indexOf("</miles>");
String miles = line.substring(nStart+7,nEnd);
console.println("service = " + miles);
nStart = line.indexOf("<part_replaced>");
nEnd = line.indexOf("</part_replaced>");
String part_replaced = line.substring(nStart+15,nEnd);
console.println("service = " + part_replaced);
//convert string to int
int dateOfService = Integer.parseInt(date);
//convert string to double
double milesAtService = Double.parseDouble(miles);
//convert service no to unique int
int serviceNo = Integer.parseInt(service_no);
// declare new object service and assign the variables then add it to the array.
Service s = new Service (reg, part_replaced, serviceNo, dateOfService, milesAtService);
serviceList.add(s);
catch (Exception e) {
// Run out of data
moreToRead = false;
} If anyone can spy anything that could be causing this I love your advice. I simply can't see it.
Johi jos,
we have been asked not to use a parser for this assignment. evil
tutor i think! lolYour example seems to imply that all the <tag> ... </tag> pairs have
to occur on a single line; if that is so, you can do some cheap
programming like this:String getText(String line, String tag) {
int start= line.indexOf("<"+tag+">");
int end= line.indexOf("</"+tag+">", start);
if (start < 0 || end < 0) return null; // no <tag> ... </tag> pair found
// return the text in between the <tag> ... </tag> tags
return line.substring(start+tag.length()+2, end);
}kind regards,
Jos -
Reading characters from a text file into a multidimensional array?
I have an array, maze[][] that is to be filled with characters from a text file. I've got most of the program worked out (i think) but can't test it because I am reading my file incorrectly. However, I'm running into major headaches with this part of the program.
The text file looks like this: (It is meant to be a maze, 19 is the size of the maze(assumed to be square). is free space, # is block, s is start, x is finish)
This didn't paste evenly, but thats not a big deal. Just giving an idea.
19
5..................
And my constructor looks like follows, I've tried zillions of things with the input.hasNext() and hasNextLine() to no avail.
Code:
//Scanner to read file
Scanner input = null;
try{
input = new Scanner(fileName);
}catch(RuntimeException e) {
System.err.println("Couldn't find the file");
System.exit(0);
//Set the size of the maze
while(input.hasNextInt())
size = input.nextInt();
//Set Limits on coordinates
Coordinates.setLimits(size);
//Set the maze[][] array equal to this size
maze = new char[size][size];
//Fill the Array with maze values
for(int i = 0; i < maze.length; i++)
for(int x = 0; x < maze.length; x++)
if(input.hasNextLine())
String insert = input.nextLine();
maze[i][x] = insert.charAt(x);
Any advice would be loved =DCode-tags sometimes cause wonders, I replaced # with *, as the code tags interprets # as comment, which looks odd:
******...*.........To your code: Did you test it step by step, to find out about what is read? You could either use a debugger (e.g., if you have an IDE) or system outs to get a clue. First thing to check would be, if the maze size is read correctly. Further, the following loops look odd:for(int i = 0; i < maze.length; i++) {
for(int x = 0; x < maze.length; x++) {
if (input.hasNextLine()) {
String insert = input.nextLine();
maze[x] = insert.charAt(x);
}Shouldn't the nextLine test and assignment be in the outer loop? And assignment be to each maze's inner array? Like so:for(int i = 0; i < maze.length; i++) {
if (input.hasNextLine()) {
String insert = input.nextLine();
for(int x = 0; x < insert.size(); x++) {
maze[i][x] = insert.charAt(x);
}Otherwise, only one character per line is read and storing a character actually should fail. -
Reading in integers from a text file
Hi, I am going to go for the 'reading in from a text file' action as I haven't done this before. So I have been looking at all the examples and am trying the one out below :) My question is that though the structure seems pretty straightforward, what is the action of the 'token' and why doesn't java recognise it as it is used in many different examples that I have seen?
public static int[] getIntegersFromFile(String fileName) throws IOException {
StringWriter writer = new StringWriter();
BufferedReader reader = new BufferedReader(new FileReader(fileName));
List<Integer> list = new ArrayList<Integer>();
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
writer.write(line + " ");
StringTokenizer tokens = new StringTokenizer(writertoString());
while (tokens.hasMoreTokens()) {
String str = tokens.nextToken();
try {
list.add(new Integer(str));
} catch (NumberFormatException e) {
System.out.println("Error '" + str + "' is not an integer.");
int[] array = new int[list.size()];
for( int i = 0; i < array.length; i++){
array[i] = list.get(i);
return array;
}Hey, first of all, a piece of advice, try formatting your codes you make easier
to understand for the people who help you. You can check out the
formatting tips
Now, A think that could help you a lot, is the next link, seek out the
documentation for the StringTokenizer class
http://java.sun.com/j2se/1.5.0/docs/api/
Here your code formated and later my interpretation of your question.
public static int[] getIntegersFromFile(String fileName) throws IOException {
StringWriter writer = new StringWriter();
BufferedReader reader = new BufferedReader(new FileReader(fileName));
List<Integer> list = new ArrayList<Integer>();
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
writer.write(line + " ");
StringTokenizer tokens = new StringTokenizer(writertoString());
while (tokens.hasMoreTokens()) {
String str = tokens.nextToken();
try {
list.add(new Integer(str));
} catch (NumberFormatException e) {
System.out.println("Error '" + str + "' is not an integer.");
int[] array = new int[list.size()];
for( int i = 0; i < array.length; i++){
array = list.get(i);
return array;
}StringTokenizer separates the string contained by the space character, and
each piece of the separated string is stored into the token.
Further on, could you extend your question about "why doesn't Java
recognize what?" please, because I don't know if you have a problem
iterating or is just that it doesn't compile or what.
Expecting your answer, to complete mine, cya around.
-Best Regards. -
How can i delete a UserName from a text file using Strings or io.
hi i m trainee
i have been assigned to make java program which deletes a UserName and
his Passwor from a Text File
i m unable to do it using the code below
plz help
do reply
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java .applet.*;
import java.io.*;
class Del extends JFrame implements ActionListener
String s2;
JTextField CWDMUserDText = new JTextField();
JButton CWDMSecDelButton = new JButton("DELETE");
JLabel CWDMUserLabel = new JLabel("USER NAME");
JPasswordField CWDMPassDText = new JPasswordField();
JLabel CWDMPassLabel = new JLabel("PASSWORD");
//String user,pass;
/* CONSTRUCTOR*/
Del()
Container contentPane=getContentPane();
contentPane.setLayout(null);
setLocation(400,200);
contentPane.add(CWDMUserDText);
contentPane.add(CWDMSecDelButton);
contentPane.add(CWDMUserLabel);
contentPane.add(CWDMPassDText);
contentPane.add(CWDMPassLabel);
CWDMUserLabel.setBounds(20,70,100,25);
CWDMPassLabel.setBounds(20,100,100,25);
CWDMUserDText.setBounds(150,70,100,25);
CWDMPassDText.setBounds(150,100,100,25);
CWDMSecDelButton.setBounds(80,135,100,25);
CWDMUserDText.addActionListener(this);
CWDMPassDText.addActionListener(this);
CWDMSecDelButton.addActionListener(this);
contentPane.setBackground(Color.CYAN);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
public void actionPerformed(ActionEvent ae)
if(ae.getSource()==CWDMSecDelButton)
// user = CWDMUserDText.getText();
// pass = CWDMPassDText.getText();
// showarr();
s2 = CWDMUserDText.getText();
CWDMUserDText.setText("");
CWDMPassDText.setText("");
DelUser(s2);
public static void main(String args[])
Del myframe1= new Del();
myframe1.setSize(300,200);
myframe1.setVisible(true);
public void DelUser(String s)
//int a;
try
FileReader fr = new FileReader("file.txt");
BufferedReader br = new BufferedReader(fr);
String s1;
int a;
int len = s.length();
System.out.println(len);
//s2 = CWDMUserDText.getText();
while ((s1=br.readLine()) !=null)
if((a=s1.indexOf(s))>0 && (a=s1.indexOf(s))!=0)
System.out.println(a);
fr.close();
catch(FileNotFoundException e)
System.out.println("exception occured");
catch(IOException e)
System.out.println("io");
}Some tips:
1) If you are adding or deleting stuff from a text file you need to write a new, modified file and then, optionally, do something like:
rename the old file to whatever.bak or the like.
rename the new file to the old.
2) Don't depend on System.out so much on a GUI application. For example if you get an exception use javax.swing.JOptionPane to display an alert (and show the message from the exception). You can write the stack trace to System.out if you want.
3) Don't muck about with calculating bounds for screen objects, let a layout manager sort it out. I like BoxLayoutManager for most things like this.
4) For bonus points do your IO in a separate Thread. Generally you don't want anything happening in an actionPerformed method which significantly delays it's return. The method should launch a new Thread to do the job, and disable the button until the Thread finishes. -
How can I use Automator to extract specific Data from a text file?
I have several hundred text files that contain a bunch of information. I only need six values from each file and ideally I need them as columns in an excel file.
How can I use Automator to extract specific Data from the text files and either create a new text file or excel file with the info? I have looked all over but can't find a solution. If anyone could please help I would be eternally grateful!!! If there is another, better solution than automator, please let me know!
Example of File Contents:
Link Time =
DD/MMM/YYYY
Random
Text
161 179
bytes of CODE memory (+ 68 range fill )
16 789
bytes of DATA memory (+ 59 absolute )
1 875
bytes of XDATA memory (+ 1 855 absolute )
90 783
bytes of FARCODE memory
What I would like to have as a final file:
EXCEL COLUMN1
Column 2
Column3
Column4
Column5
Column6
MM/DD/YYYY
filename1
161179
16789
1875
90783
MM/DD/YYYY
filename2
xxxxxx
xxxxx
xxxx
xxxxx
MM/DD/YYYY
filename3
xxxxxx
xxxxx
xxxx
xxxxx
Is this possible? I can't imagine having to go through each and every file one by one. Please help!!!Hello
You may try the following AppleScript script. It will ask you to choose a root folder where to start searching for *.map files and then create a CSV file named "out.csv" on desktop which you may import to Excel.
set f to (choose folder with prompt "Choose the root folder to start searching")'s POSIX path
if f ends with "/" then set f to f's text 1 thru -2
do shell script "/usr/bin/perl -CSDA -w <<'EOF' - " & f's quoted form & " > ~/Desktop/out.csv
use strict;
use open IN => ':crlf';
chdir $ARGV[0] or die qq($!);
local $/ = qq(\\0);
my @ff = map {chomp; $_} qx(find . -type f -iname '*.map' -print0);
local $/ = qq(\\n);
# CSV spec
# - record separator is CRLF
# - field separator is comma
# - every field is quoted
# - text encoding is UTF-8
local $\\ = qq(\\015\\012); # CRLF
local $, = qq(,); # COMMA
# print column header row
my @dd = ('column 1', 'column 2', 'column 3', 'column 4', 'column 5', 'column 6');
print map { s/\"/\"\"/og; qq(\").$_.qq(\"); } @dd;
# print data row per each file
while (@ff) {
my $f = shift @ff; # file path
if ( ! open(IN, '<', $f) ) {
warn qq(Failed to open $f: $!);
next;
$f =~ s%^.*/%%og; # file name
@dd = ('', $f, '', '', '', '');
while (<IN>) {
chomp;
$dd[0] = \"$2/$1/$3\" if m%Link Time\\s+=\\s+([0-9]{2})/([0-9]{2})/([0-9]{4})%o;
($dd[2] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of CODE\\s/o;
($dd[3] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of DATA\\s/o;
($dd[4] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of XDATA\\s/o;
($dd[5] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of FARCODE\\s/o;
last unless grep { /^$/ } @dd;
close IN;
print map { s/\"/\"\"/og; qq(\").$_.qq(\"); } @dd;
EOF
Hope this may help,
H -
How to read some lines from a text file using java.
hi,
i m new to java and i want to read some lines from a text file based on some string occurrence in the file. This file to be read in steps.
we only want to read the file upto the first Occurrence of "TEXT" string.
How to do it ,,,
Kinldy give the code
Regards,
Sagar
this is the text file
dfgjdjj
sfjhjkd
ghjkdg
hjkdgh TEXT
ikeyt
ujt
jk
tyk TEXT
rukl
rHendawy wrote:
Since the word "TEXT" is formed of 4 letters, you would read the text file 4 bytes by four bytes. Wrong on two counts. First, the file may not be encoded 1 byte per character. It could be utf-16 in which case it would be two byte per character. Second, even if it were 1 byte per character, the string "Text" may not start on a 4 byte boundary.
Consider a FileInputStream object "fis" that points to your text file. use fis.read(byte[] array, int offset, int len) to read every four bytes. Convert the "TEXT" String into a byte array "TEXT".getBytes(), and yous the Arrays class to compare the equality of the read bytes with your "TEXT".getBytes()Wrong since it relies on my second point and will fail when fis.read(byte[] array, int offset, int len) does not read 4 bytes (as is no guaranteed to). Check the Javadoc. Also, the file may not be encoded with the default character encoding.
The problem is easily solved by reading a line at a time using a BufferedReader wrapping an InputStreamReader wrapping a FileInputStream and specifying the correct character encoding.
Edited by: sabre150 on Apr 29, 2009 2:13 PM -
Error while loading data from a text file to a datastore
Hi all,
i am a starter in ODI. I am trying to load data from a text file into a datastore. I have put the file on a unix server whose location is defined in the topology manager. when i am trying to "view data" it is giving me error file does not exist at <location where i have put the file>. Please help meHi,
1. If your files are on a remote File System, you will need to copy one of your files to the machine ODI Designer is running on to allow ODI to retrieve the metadata information of the file.
2. In Topology create a Physical Schema, the directory you enter for Data and Work Schema should point at this local file.
3. Then define the File Datastore in ODI Designer. Enter a name, browse and select the file and fill in each filed of the Files tab.
* If its a Fixed file, click on the grid icon on the Columns tab to enter the columns and have Automatic Adjustment checked.
* If its a Delimited file, use the Reverse button on the Columns tab to reverse the columns.
* Right click on the File Datastore select View Data, if you can view data, that means the File Datastore has been defined correctly.
* If not, check each tab of the File Datastore to make sure everything is defined correctly and retry.
4. Once View Data is successful, you now change the directories (Data and Work Schema in Topology) to point at the remote File System. These directories must be accessible to the ODI Agent that will be used to run the transformations. The directory can be an absolute path (m:/public/data/files) or relative to the ODI Agent startup directory (../demo/files). It is strongly advised to use a UNC (independent from the execution location) for the path. When running the transformations with "no agent", the directory is relative to the directory where Oracle Data Integrator has been installed.
You need to have a agent process running at the system where your source file resides .
Then while running the odi interface choose that agent .
Thanks,
Sutirtha -
Getting repeated values when reading from a text file.
I need to read from a text file. When the token encounters a particular word (command) I need to read the next line and perform some actions. However, this part is working but it is repeating the values again and again until it encounters the next particular word (command). Hope that someone will help me out, as always when I posted a problem in these forums.
SetOperations class - contains the set methods
// Imported packages.========================================================
import java.util.Vector;
import java.util.Iterator;
// Public class SetOperations.===============================================
public class SetOperations
// Instance variables.===================================================
private Vector v = null; // Creates new instance of vector.
protected int memberCount;
// Constructor.==========================================================
public SetOperations()
v = new Vector();
} // end constructor.
// Method isMember.======================================================
* Checks whether the element is already a member of the set.
* @return True if Vector v contains Object member.
public boolean isMember(Object member)
if (member != null) // only if Object member is not null.
return v.contains(member); // returns true if vector already contains member.
else
return false; // returns false if vector does not contain member.
} // end public boolean isMember(Object member).
// Method addMember.=====================================================
* Adds a member to the set.
* @return Adds Object member to Vector v.
public void addMember(Object member)
//if (! v.contains(member)) // only if element is not already a member.
if (isMember(member) == false) // only if element is not already a member.
v.add(member); // adds a member.
} // end public void addMember(Object member).
// Method countMember.===================================================
* Returns the number of members present in the vector.
* @return Number of elements present in the vector.
public int countMember()
return v.size();
} // end public int countMember().
// Method isSetEmpty.====================================================
* Returns true if set is empty.
* @return True if no elements are present in Vector v.
public boolean isSetEmpty()
return v.size() == 0; // returns 0 if no elements are present in the vector.
} // end of public boolean isSetEmpty().
// Method printMember.===================================================
* Displays member/s of the set.
* @return Prints element/s present in the vector.
public void printMember()
for (int i = 0; i < v.size(); i++) // iterates through present members.
System.out.println("[" + i + "] " + v.get(i)); // displays member/s present in the vector.
} // end of public void printMember().
} // end public class SetOperations.
SetTextLauncher class - reads from a text file and implements the set operations
// Imported packages.========================================================
import java.util.*;
import java.io.*;
// Public class SetTestLauncher.=============================================
public class SetTestLauncher
// Main method public static void main(String args[]).===================
public static void main(String args[])
displayFile("test.txt"); // outputs result from text file.
// method to display a file on screen
public static void displayFile (String textFile)
// Instance variables.===============================================
// Creates new instances of SetOperations.
SetOperations setA = new SetOperations();
SetOperations setB = new SetOperations();
SetOperations setC = new SetOperations();
SetOperations setD = new SetOperations();
SetOperations setE = new SetOperations();
// Initialisation.
String line = "", nextLine = "";
FileReader fr = null;
try
// Opens the file with the FileReader data sink stream.
fr = new FileReader(textFile);
// Converts the FileReader input stream with the BufferedReader processing stream.
BufferedReader br = new BufferedReader(fr);
// Iterates through text file reading lines until end of text lines.
while (line != null)
line = br.readLine(); // reads one line at a time.
if(line == null) break; // when the line is null break the loop.
// Creates a new instace of StringTokenizer.
StringTokenizer st = new StringTokenizer(line);
// Loops until there are no more tokens.
while (st.hasMoreTokens())
String token = st.nextToken(); // reads next token.
// Only if the token encounters the String "membera".
if(token.equals("membera"))
nextLine = br.readLine(); // gets next line.
setA.addMember(nextLine); // adds a member to the set.
// Displays members present in the set if vector is not empty.
if (! setA.isSetEmpty())
setA.printMember(); // print members present.
// Displays the number of member/s present in the vector.
System.out.println("Number of set members: " + setA.countMember());
// Catches and displays exceptions.
catch (FileNotFoundException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
catch (IOException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
finally
try
// if file is found
if (fr != null)
// close file
fr.close();
catch (IOException exp)
exp.printStackTrace();
} // end public static void main(String args[]).
} // end public class SetTestLauncher.Thanks for your interest. Please ignore SetOperations class, it is just the class containing the methods and it works correctly since I checked it without reading from a text file. I marked the part where I think lies my problem in class SetTestOperations.
The information in the text file is as follows:
membera
Hillman
membera
Skoda
membera
Honda
membera
Toyota
and the result is:
[0] Hillman
Number of set members: 1
[0] Hillman
[1] Skoda
Number of set members: 2
[0] Hillman
[1] Skoda
[2] Honda
Number of set members: 3
[0] Hillman
[1] Skoda
[2] Honda
[3] Toyota
Number of set members: 4
instead of just one set:
[0] Hillman
[1] Skoda
[2] Honda
[3] Toyota
Number of set members: 4
Hope it is easier to understand like this.
Regards
Marco
I need to read from a text file. When the token
encounters a particular word (command) I need to read
the next line and perform some actions. However, this
part is working but it is repeating the values again
and again until it encounters the next particular
word (command). Hope that someone will help me out,
as always when I posted a problem in these forums.
SetOperations class - contains the set
methods
// Imported
packages.=============================================
===========
import java.util.Vector;
import java.util.Iterator;
// Public class
SetOperations.========================================
=======
public class SetOperations
// Instance
e
variables.============================================
=======
private Vector v = null; // Creates new instance of
f vector.
protected int memberCount;
Constructor.==========================================
================
public SetOperations()
v = new Vector();
} // end constructor.
// Method
d
isMember.=============================================
=========
* Checks whether the element is already a member of
f the set.
* @return True if Vector v contains Object member.
public boolean isMember(Object member)
if (member != null) // only if Object member is not
ot null.
return v.contains(member); // returns true if
if vector already contains member.
else
return false; // returns false if vector does not
not contain member.
} // end public boolean isMember(Object member).
// Method
d
addMember.============================================
=========
* Adds a member to the set.
* @return Adds Object member to Vector v.
public void addMember(Object member)
//if (! v.contains(member)) // only if element is
is not already a member.
if (isMember(member) == false) // only if element
nt is not already a member.
v.add(member); // adds a member.
} // end public void addMember(Object member).
// Method
d
countMember.==========================================
=========
* Returns the number of members present in the
e vector.
* @return Number of elements present in the vector.
public int countMember()
return v.size();
} // end public int countMember().
// Method
d
isSetEmpty.===========================================
=========
* Returns true if set is empty.
* @return True if no elements are present in Vector
r v.
public boolean isSetEmpty()
return v.size() == 0; // returns 0 if no elements
ts are present in the vector.
} // end of public boolean isSetEmpty().
// Method
d
printMember.==========================================
=========
* Displays member/s of the set.
* @return Prints element/s present in the vector.
public void printMember()
for (int i = 0; i < v.size(); i++) // iterates
es through present members.
System.out.println("[" + i + "] " + v.get(i)); //
// displays member/s present in the vector.
} // end of public void printMember().
} // end public class SetOperations.
SetTextLauncher class - reads from a text file
and implements the set operations
// Imported
packages.=============================================
===========
import java.util.*;
import java.io.*;
// Public class
SetTestLauncher.======================================
=======
public class SetTestLauncher
// Main method public static void main(String
g args[]).===================
public static void main(String args[])
displayFile("test.txt"); // outputs result from
om text file.
// method to display a file on screen
public static void displayFile (String textFile)
// Instance
ce
variables.============================================
===
// Creates new instances of SetOperations.
SetOperations setA = new SetOperations();
// Initialisation.
String line = "", nextLine = "";
FileReader fr = null;
try
// Opens the file with the FileReader data sink
ink stream.
fr = new FileReader(textFile);
// Converts the FileReader input stream with the
the BufferedReader processing stream.
BufferedReader br = new BufferedReader(fr);
// Iterates through text file reading lines until
til end of text lines.
while (line != null)
line = br.readLine(); // reads one line at a
at a time.
if(line == null) break; // when the line is null
null break the loop.
// Creates a new instace of StringTokenizer.
StringTokenizer st = new StringTokenizer(line);
// Loops until there are no more tokens.
while (st.hasMoreTokens())
String token = st.nextToken(); // reads next
next token.
// Only if the token encounters the String
tring "membera".
if(token.equals("membera"))
// *****THE PROBLEM LIES HERE....I GUESS
// need to read the next line after encountering the word membera in text file
nextLine = br.readLine(); // gets next line.
setA.addMember(nextLine); // adds a member to
ber to the set.
// Displays members present in the set if
set if vector is not empty.
if (! setA.isSetEmpty())
setA.printMember(); // print members present.
// Displays the number of member/s present in
ent in the vector.
System.out.println("Number of set members: " +
s: " + setA.countMember());
// Catches and displays exceptions.
catch (FileNotFoundException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
catch (IOException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
finally
try
// if file is found
if (fr != null)
// close file
fr.close();
catch (IOException exp)
exp.printStackTrace();
} // end public static void main(String args[]).
} // end public class SetTestLauncher. -
Is there a way where i can parse a method, or conditional statement from a text file? Like lets say that i had the statement in Test.txt
if(X >= Y)
do something
}and X and Y are already defined in the java file, is there a way that i could parse it so that the java code invokes it, as if it were part of the java file?Here's a little Groovy demo:
import groovy.lang.GroovyShell;
* To run this demo,
* - download 'groovy-binary-1.5.5.zip': http://dist.groovy.codehaus.org/distributions/groovy-binary-1.5.5.zip
* - unzip, and add 'lib/groovy-all-1.5.5.jar' to your classpath
public class GroovyDemo {
public static void main(String[] args) throws Exception {
String script =
" if(X > Y) { \n"+
" return X+X \n"+
" } else { \n"+
" return Y/4 \n"+
" } \n";
System.out.println("script=\n"+script);
GroovyShell shell = new GroovyShell();
shell.setProperty("X", new Integer(10));
shell.setProperty("Y", new Integer(9));
Object value = shell.evaluate(script);
System.out.println("value="+value+", "+value.getClass());
shell.setProperty("X", new Integer(8));
value = shell.evaluate(script);
System.out.println("value="+value+", "+value.getClass());
/* output:
script=
if(X > Y) {
return X+X
} else {
return Y/4
value=20, class java.lang.Integer
value=2.25, class java.math.BigDecimal
*/ -
Reading text from a text file(what else!!!!!)
okay to save time here i've managed to read the text from the text file and display in the console
my question is - is there a way to read the text a character at a time, at present i read it as a string, the reason i need a character is that i have to check each character to check for brackets ({[ and [})
public void loadFile() {
JFileChooser fLoad = new JFileChooser();
fLoad.setFileSelectionMode(JFileChooser.FILES_ONLY);
int result = fLoad.showOpenDialog(this);
File file = fLoad.getSelectedFile();
if(file == null) return;//if no file selected return
String text = new String();
try //exception handler
BufferedReader input;
input = new BufferedReader(
new InputStreamReader(
new FileInputStream(file)));
while((text = input.readLine()) != null) //print it out, line by line
char array[] = text.toCharArray();
checkFile(array);
System.out.println(text);//test case
input.close();//close file
as listed i have attempted to fill a char array with the characters from the string but when i try to access the array with
public void checkFile(char array[]) {
for(int i=0; i<array.length;i++) {
if(array.equals("(")) System.out.println("(");//doesn't work
System.out.println(array[i]);//works
the if loop gives me an error
C:\Documents and Settings\korbitz\Desktop\bracket\Bracket.java:168: char cannot be dereferenced
any help will be appreciatedif(array.equals("(")) System.out.println("(");//doesn't workinstead try
if(array.equals("(")) System.out.println("(");
You could also try the String methods myString.indexOf() (but you'd have to do one for each char you're looking for)
A better alternative might be using a StringTokenizer
StringTokenizer stk = new StringTokenizer(myString, "({[]})");
if(stk.countTokens()!=1)
// then you must have a bracket/brace dividing your string
}Good luck,
Radish21 -
Removing the Control Characters from a text file
Hi,
I am using the java.util.regex.* package to removing the control characters from a text file. I got below programming from the java.sun site.
I am able to successfully compile the file and the when I try to run the file I got the error as
------------------------------------------------------------------------D:\Debi\datamigration>java Control
Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal repet
ition
{cntrl}
at java.util.regex.Pattern.error(Pattern.java:1472)
at java.util.regex.Pattern.closure(Pattern.java:2473)
at java.util.regex.Pattern.sequence(Pattern.java:1597)
at java.util.regex.Pattern.expr(Pattern.java:1489)
at java.util.regex.Pattern.compile(Pattern.java:1257)
at java.util.regex.Pattern.<init>(Pattern.java:1013)
at java.util.regex.Pattern.compile(Pattern.java:760)
at Control.main(Control.java:24)
Please help me on this issue.
Thanks&Regards
Debi
import java.util.regex.*;
import java.io.*;
public class Control {
public static void main(String[] args)
throws Exception {
//Create a file object with the file name
//in the argument:
File fin = new File("fileName1");
File fout = new File("fileName2");
//Open and input and output stream
FileInputStream fis =
new FileInputStream(fin);
FileOutputStream fos =
new FileOutputStream(fout);
BufferedReader in = new BufferedReader(
new InputStreamReader(fis));
BufferedWriter out = new BufferedWriter(
new OutputStreamWriter(fos));
// The pattern matches control characters
Pattern p = Pattern.compile("{cntrl}");
Matcher m = p.matcher("");
String aLine = null;
while((aLine = in.readLine()) != null) {
m.reset(aLine);
//Replaces control characters with an empty
//string.
String result = m.replaceAll("");
out.write(result);
out.newLine();
in.close();
out.close();Hi,
I used the code below with the \p, but I didn't able to complie the file. It gave me an
D:\Debi\datamigration>javac Control.java
Control.java:24: illegal escape character
Pattern p = Pattern.compile("\p{cntrl}");
^
1 error
Please help me on this issue.
Thanks&Regards
Debi
// The pattern matches control characters
Pattern p = Pattern.compile("\p{cntrl}");
Matcher m = p.matcher("");
String aLine = null; -
Interactive Bar/pie chart and line graph, data from excel/text file -urgent
Hi,
I have a huge data in excell sheet which keeps updating every month. Data basically consists of service provider and there respective subscribers from various regions of the country over the years. The requirement is to give the viewers an interactive page where in they can make various combinations and can compare, cross examine data according to thier choice.
We want the pie chart / bar graph or line graph to be created on the fly according to the combination made by the user.
The site is hosted on a red hat linux server. how can a connection to the excel spreadsheet be made or is it possible to read from the text file if the entire data is exported to a text file.
Is there any ready made tool/code available which can be customised according to the need.
Thanx in advance
Regards
PrakashI certainly wouldn't pay for the graphing package at the previous link. check out http://www.object-refinery.com/jfreechart/ for a free, open-source, much better looking graphing package.
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