Problem with an array
i have problem with my program i implement saveing method
but when i open file( game.txt) it does not update my board it return same postion every time i same game
chess class Jframe(Jfilechooser)(call an board array)---->
Gui Japplet class( call and board array------------>
Board(class Jpanel have board array)
it does not update borad array
it just call it once in start and return the same value every time
classChess(){
ChessPlayer java = new ChessPlayer();
public void saveData()
File file = null;
JFileChooser fc = new JFileChooser();
fc.setCurrentDirectory(new File("."));
fc.setDialogTitle("Save Text As...");
int returnVal = fc.showSaveDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{ file = fc.getSelectedFile();
try
{ PrintWriter out =
new PrintWriter(
new BufferedWriter(
new FileWriter(file)));
//while for all the moves in the array>
for (int i=0;i<120;i++)
out.println( java.saveDAta(i));
out.println("\n");
out.close();
catch (IOException e) {
// Some error has occured while trying to read the file.
// Show an error message.
JOptionPane.showMessageDialog(this,
"Sorry, some error occurred:\n" + e.getMessage());}
public static void main(String[] args) {
JPopupMenu.setDefaultLightWeightPopupEnabled(false);
JFrame frame = new ChessMan();
Container content = frame.getContentPane();
ChessMan f = new ChessMan();
//japplet
ChessPlayer javaAppletication = new ChessPlayer();
javaAppletication.init();
javaAppletication.start();
}Gui
[Gui]
class Gui{
int [] board = new int [120];
int [] boardcolor = new int [120];
Board check = new Board(this,false);
{public void init()
{ // Create new Border
contentPane = getContentPane();
bboard = new Board(this,false);
public String saveDAta(int i)
String l=check. save(i);
return (l);
and finally board Jpanel
class Board extends JPanel
{public Board (JApplet useapplet,boolean bool) {
setup();
{ public String save(int i)
{ String l;
if (color==1)
{System.out.println("notpossible");}
l = board[i]+"$"+boardColor;
return l;
thanks guys
My Jframe
public class ChessMan extends JFrame implements ActionListener, WindowListener {
JMenuItem saveItem, loadItem, copyItem, pasteItem;
JMenu fileMenu, editMenu;
JMenuBar bar;
ChessPlayer java = new ChessPlayer();
public ChessMan() { setTitle("CHESS PLAYER GAME" );
setSize(200,300);
System.out.println("\n"); }
addWindowListener(new java.awt.event.WindowAdapter()
{ public void windowClosing(java.awt.event.WindowEvent e)
{ System.exit(0); } });
JMenu fileMenu = new JMenu("File");
saveItem = new JMenuItem("Save");
saveItem.setActionCommand("save");
saveItem.setAccelerator( KeyStroke.getKeyStroke("ctrl S"));
saveItem.addActionListener(this);
fileMenu.add(saveItem);
loadItem = new JMenuItem("Load");
loadItem.setActionCommand("load");
loadItem.setAccelerator( KeyStroke.getKeyStroke("ctrl L"));
loadItem.addActionListener(this);
fileMenu.add(loadItem);
JMenu editMenu = new JMenu("About");
copyItem = new JMenuItem("Help");
copyItem.setActionCommand("Help");
copyItem.setAccelerator( KeyStroke.getKeyStroke("ctrl H"));
copyItem.addActionListener(this);
editMenu.add(copyItem);
pasteItem = new JMenuItem("Exit");
pasteItem.setActionCommand("Exit");
pasteItem.setAccelerator( KeyStroke.getKeyStroke("ctrl E"));
pasteItem.addActionListener(this);
editMenu.add(pasteItem);
JMenuBar bar = new JMenuBar();
bar.add(fileMenu);
bar.add(editMenu);
setJMenuBar(bar);
setVisible(true);
setLocation(0,0);
public void actionPerformed(ActionEvent e) {
JMenuItem item = (JMenuItem)e.getSource();
String ac = item.getActionCommand();
System.out.println("ac = "+ ac);
// you can use action commands to track menu item events
if(ac.equals("save"))
{System.out.println("ac.equals(\"save\") = "+ ac.equals("save"));
saveData();}
if(ac.equals("load"))
{System.out.println("ac.equals(\"load\") = "+ ac.equals("load"));
loadingData();}
if(ac.equals("Help"))
{System.out.println("ac.equals(\"load\") = "+ ac.equals("Help"));
if(ac.equals("Exit"))
{System.out.println("ac.equals(\"load\") = "+ ac.equals("Exit"));
Exit();}
// the event origin
if(item == saveItem)
System.out.println("item = "+ item.toString().substring
(item.toString().indexOf("text=") + 5, item.toString().lastIndexOf("]")));
if(item == loadItem)
System.out.println("item = "+ item);
// System.out.print( java.saveDAta());
public void saveData()
File file = null;
JFileChooser fc = new JFileChooser();
fc.setCurrentDirectory(new File("."));
fc.setDialogTitle("Save Text As...");
int returnVal = fc.showSaveDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{ file = fc.getSelectedFile();
try
{ PrintWriter out =
new PrintWriter(
new BufferedWriter(
new FileWriter(file)));
//while for all the moves in the array>
for (int i=0;i<120;i++)
out.println( java.saveDAta(i));
out.println("\n");
out.close();
catch (IOException e) {
// Some error has occured while trying to read the file.
// Show an error message.
JOptionPane.showMessageDialog(this,
"Sorry, some error occurred:\n" + e.getMessage());}
public void loadingData()
File loadfile = null;
JFileChooser fc = new JFileChooser();
fc.setDialogTitle("OpenFile...");
fc.setCurrentDirectory(new File("."));
int returnVal = fc.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{ loadfile = fc.getSelectedFile();
try
{ PrintWriter out =
new PrintWriter(
new BufferedWriter(
new FileWriter(loadfile)));
//while for all the moves in the array>
out.println("�����������������");
out.println("\n");
out.close();
catch (IOException e) {
// Some error has occured while trying to read the file.
// Show an error message.
JOptionPane.showMessageDialog(this,
"Sorry, some error occurred:\n" + e.getMessage());}
public void Exit()
System.exit(0);
public static void main(String[] args) {
JPopupMenu.setDefaultLightWeightPopupEnabled(false);
JFrame frame = new ChessMan();
Container content = frame.getContentPane();
ChessMan f = new ChessMan();
f.setLocation(300,300);
f.show();
ImageIcon customImageIcon = new ImageIcon("ac516.gif");
Image customImage = customImageIcon.getImage();
frame.setIconImage(customImage);
//japplet
ChessPlayer javaAppletication = new ChessPlayer();
// i could not put my constructor here <Static>
javaAppletication.init();
javaAppletication.start();
// for(int i=0; i < .length(); i++)
content.add(javaAppletication, BorderLayout.CENTER);
frame.getContentPane();
javaAppletication.setBackground (Color.black);
frame.setVisible(true);
frame.show();
frame.pack(); // invokes getPreferredSize()
// invokes paint();
public void windowOpened(WindowEvent e) {
fileMenu.doClick();
public void windowClosing(WindowEvent e) {}
public void windowClosed(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
My Japplet Class
class ChessPlayer extends JApplet
implements ActionListener,MouseListener
int c;
//Reference for new Board
Board bboard;
//Reference for Button
JButton newgame,undo,onePlayer,TwoPlayer,NormalPieceSet,
FuunyPieceSet,startButton,stopButton;
//Reference for Label
JLabel message;
//Reference for new Panel
JPanel buttonpanel2,buttonpanel,messagepanel,buttonpane;
//Initilize the Applet
DemoAnimation Demo;
Container contentPane;
Board check = new Board(this,false);
int [] board = new int [120];
int [] boardcolor = new int [120];
public void init()
// Create new Border
contentPane = getContentPane();
check = new Board(this,false);
bboard = new Board(this,false);
bboard.setPreferredSize(new Dimension(500,400));
bboard.setBorder(BorderFactory.createLineBorder( Color.red ) );
contentPane.add(bboard);
final ImageIcon image = new ImageIcon("ac516.gif");
bboard.addMouseListener(this);
bboard.setBackground (Color.black);
BorderLayout text=new BorderLayout();
Demo = new DemoAnimation( this );
Demo.setPreferredSize(new Dimension(160, 500));
contentPane.add(Demo);
// Set Background Black
contentPane.setBackground (Color.black);
contentPane.setLayout (new BorderLayout (50,50));
// set new Font "TimesRoman"
Font Text= new Font("TimesRoman", Font.BOLD,15);
//panel to keep buttons together
buttonpanel=new JPanel();
buttonpanel.setLayout(new GridLayout(1,2,6,0));
buttonpanel.add(newgame=new JButton("new game",image));
newgame.addActionListener(this);
buttonpanel.add(undo=new JButton("undo"));
undo.addActionListener(this);
// Create new Choice Panel
buttonpanel2 = new JPanel();
buttonpanel2.setLayout(new GridLayout(6,1,0,10));
buttonpanel2.add(onePlayer=new JButton("Change Colour"));
onePlayer.addActionListener(this);
buttonpanel2.add(TwoPlayer=new JButton("Statistic"));
TwoPlayer.addActionListener(this);
buttonpanel2.add(NormalPieceSet=new JButton("Quit"));
NormalPieceSet.addActionListener(this);
buttonpanel2.add(FuunyPieceSet=new JButton("Change Piece"));
FuunyPieceSet.addActionListener(this);
buttonpanel2.add(startButton = new JButton("Start Animation"));
startButton.addActionListener(this);
buttonpanel2.add(stopButton = new JButton("Stop Animation"));
stopButton.addActionListener(this);
contentPane.add(BorderLayout.WEST, demopanel);
// Set Font For Text Message
setFont(Text);
messagepanel=new JPanel();
messagepanel.setBorder(BorderFactory.createLineBorder( Color.red ) );
messagepanel.setBackground(Color.black);
// essagepanel.setLayout(new GridLayout(1,1));
// Create new Label
messagepanel.add(message = new JLabel());
setMessage("Welcome");
// Postion panels in Layout
contentPane.add("North",buttonpanel);
contentPane.add("East",buttonpanel2);
contentPane.add ("South",messagepanel);
contentPane.add ("Center",bboard);
contentPane.add("West",Demo);
public void mouseReleased(java.awt.event.MouseEvent e)
{ statuseChange();}
public void mouseClicked(java.awt.event.MouseEvent e)
public void mouseEntered(java.awt.event.MouseEvent e) {
public void mouseExited(java.awt.event.MouseEvent e) {
public void mouseMoved(java.awt.event.MouseEvent e) {
statuseChange();
public void mousePressed(java.awt.event.MouseEvent e)
{statuseChange();
public void actionPerformed(ActionEvent e)
Object source=e.getSource();
if (source == newgame)
{ bboard.newgame();
yellow();
setMessage("try again");
pause(100);
c=add(c);
else if (source==undo)
yellow();
bboard.undo();
setMessage("Undo");
else if (source== TwoPlayer )
//bboard.setup();
yellow();
setMessage("Starting new Game");
setMessage("Change Color");
else if(source == FuunyPieceSet)
{yellow();
setMessage("game played::" +c);
bboard.PieceChange();
else if(source == NormalPieceSet)
{yellow();
setMessage("GOODBYE");
destroy();
else if(source == startButton)
{yellow();
setMessage("Start Animation");
Demo.start();
else if(source == stopButton)
{yellow();
setMessage("Stop Animation");
Demo.stop();
else if(source == onePlayer)
{setMessage("");
bboard.changePiece();
setMessage("Change Color");
public void statuseChange()
switch (bboard.gameStatus())
case 1:
red();
setMessage("White won");
break;
case 2:
red();
setMessage("Black won");
break;
case 3:
red();
setMessage("DRAW");
Demo.changeAnimation(2);
break;
case 4:
white();
setMessage("White Turn");
Demo.changeAnimation(1);
break;
case 5:
green();
setMessage("Black turn");
Demo.changeAnimation(3);
break;
case 6:
red();
setMessage(" Check");
Demo.changeAnimation(4);
break;
case 7:
red();
setMessage("Check");
Demo.changeAnimation(4);
break;
case 8:
yellow();
setMessage("I Hope you enjoyed it");
public String saveDAta(int i)
String l=check.save(i);
return (l);
public void LoadData(String load)
public void setMessage(String s)
/*The string s will be shown to the user.*/
Font Text= new Font("Courier", Font.BOLD,30);
message.setText(s);
message.setFont(Text);
public void white()
{ message.setForeground(Color.white);}
public void green()
message.setForeground(Color.green);
public void red()
message.setForeground(Color.red);
public void yellow()
message.setForeground(Color.yellow);
// pause method
void pause(int time)
try {Thread.sleep(time);
} catch (InterruptedException e)
// Create new inset Object
public Insets getInsets()
return new Insets(50,220,150,200);
public void destroy()
contentPane.remove(buttonpanel2);
contentPane.remove(buttonpanel);
contentPane.remove(bboard);
contentPane.repaint();
Demo.start();
public int add(int x)
{ int b=x+1;
return b;
}tanx man i dont the other two because they are to long
my is when i open jframe
i think Japplet and Jframe can not commuinicate to each other
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Message was edited by: Pippa01
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I have this function that randomly allocates free time to coursework blocks. This method works because I have tested numerous times and it always prints of different allocations of time every time its called.
The problem that I have is that I have this method that called this method twice to store each different call within a separate ArrayList.
When I make the first call the block are assigned to the array fine. But when I called it a second time to store the next result within a separate Array the first Array result are overwritten . Any body have any idea why this is happening, I have asked numerous friends and even my supervisor and he can't find anything wrong with it. Any help would be very helpful...
Code:
public ArrayList<CourseworkTimeBlock> courseworkAllocation(ArrayList timetable, ArrayList<CourseworkTimeBlock> cCourseworkBlocks){
// Calculates and stores the free "time blocks" that can be used
// to allocate coursework.
ArrayList<Integer> freeTimeBlocks = new ArrayList<Integer>();
freeTimeBlocks = freeBlocks(timetable);
Random random = new Random();
ArrayList<CourseworkTimeBlock> courseworkTimeBlocks = new ArrayList<CourseworkTimeBlock>();
for(int i = 0; i < cCourseworkBlocks.size(); i++){
int allocateTo = -100;
int randomPoint = 0;
CourseworkTimeBlock courseworkBlock;
courseworkBlock = cCourseworkBlocks.get(i);
while(allocateTo < 0){
randomPoint = random.nextInt(freeTimeBlocks.size());
allocateTo = freeTimeBlocks.get(randomPoint);
courseworkBlock.setBlockAllocated(allocateTo);
courseworkTimeBlocks.add(courseworkBlock);
freeTimeBlocks.set(randomPoint, -1 );
for( int i = 0; i < courseworkTimeBlocks.size(); i++){
System.out.println("CW: " + courseworkTimeBlocks.get(i).getBlockAllocated());
return courseworkTimeBlocks;
}These are the calls I make in a separate method:
ArrayList<CourseworkTimeBlock> courseworkTimetableOne = new ArrayList<CourseworkTimeBlock>();
ArrayList<CourseworkTimeBlock> courseworkTimetableTwo = new ArrayList<CourseworkTimeBlock>();
courseworkTimetableOne = courseworkAllocation(fixedTimetable, courseworkBlocks);
courseworkTimetableTwo = courseworkAllocation(fixedTimetable, courseworkBlocks);Edited by: ChrisUK on Mar 1, 2008 9:11 AMChrisUK wrote:
Thanks for the reply.
In terms of the:
courseworkTimetableOne = courseworkAllocation(fixedTimetable, courseworkBlocks);
courseworkTimetableTwo = courseworkAllocation(fixedTimetable, courseworkBlocks);They are both supposed to pass in the fixedTimetable object, the reason being is that this is a timetable and is passed through in order to find it "free time" blocks.
The courseworkTimetableOne and courseworkTimetableTwo are just different representations of how the coursework time blocks could be allocated to that given fixedtimetable. You're calling the same method with the same parameters, so both references are going to point to the same object. It's the same as if you just replaced the second line with courseworkTimetableTwo = courseworkTimetableOne.
You've got two references pointing to the same object.
The fact that you do this first:
ArrayList<CourseworkTimeBlock> courseworkTimetableOne = new ArrayList<CourseworkTimeBlock>();
ArrayList<CourseworkTimeBlock> courseworkTimetableTwo = new ArrayList<CourseworkTimeBlock>();means nothing. You create the two new ArrayLists, but then this
courseworkTimetableOne = courseworkAllocation(fixedTimetable, courseworkBlocks);
courseworkTimetableTwo = courseworkAllocation(fixedTimetable, courseworkBlocks);gets rid of them. The new ArrayLists you just created are lost.
Remember when you assign to a reference variable such as courseworkTimetableOne =, all that does is copy a reference so now courseworkTimetableOne is pointing to the same object that whatever is on the RHS is pointing to.
If you want two different lists, then either courseworkAllocation should make a copy of its internal list and return that, or else the caller should do it.
>
By the way what does "SSCCE" mean?[http://mindprod.com/jgloss/sscce.html|http://mindprod.com/jgloss/sscce.html]
[http://homepage1.nifty.com/algafield/sscce.html|http://homepage1.nifty.com/algafield/sscce.html] -
Problem With Referenced Array Loading
Hi. I'm working on the final lab for my java class at the moment, and I'm to create a program which reads a file containing transaction records, stores each record as an array element, and then prints various types of reports using the array of transactions. I've created a class called Transaction which stores all the data for each transaction, and the array used in my program is of type Transaction.
I'm not having any problems in writing the program, except there's something going wrong with my attempt to write a method to load the array. The method declaration is:
* Method to accept a file from the user and load its data into an array.
* Returns the number of elements added to the array.
public static int loadArray(Transaction[] transactionArray, int size) throws ExceptionNow, I'm under the impression (and my teacher confirmed this) that arrays are passed by reference. So I'm assuming that by creating an array in my main method, passing it into loadArray(), and changing the values within the method, all the data will be present in the array within main without having to explicitly return the loaded array.
However, as soon as I try to do anything with the loaded array, I get a NullPointerException. I opened up the debug mode, set a breakpoint in my main right after loadArray() is called, and it shows that every element in my array is null. I am at a loss as to why. If anyone can help me figure out why my reference array isn't staying updated as it's edited elsewhere, it would be greatly appreciated.
Here is my loadArray() code in case it would help, but there is no error in it's execution, as the same code directly in my main method works fine.
public static int loadArray(Transaction[] transactionArray, int size) throws Exception
int logicalSize = 0; // the number of transactions loaded into the array
int itemID; // the item ID involved in the transaction
int units; // the number of units in the transaction
double unitCost; // the cost of each unit in the transaction
char type; // the type of the transaction
String date; // the date of the transaction
String fileName; // the name of the user selected file
String record; // the current record in the file
Scanner file; // reads input from a user selected file
Scanner parse; // reads input from the file's current record
transactionArray = new Transaction[size]; // creates a new array for the new data
System.out.print("Please enter a file name: ");
fileName = input.nextLine();
file = new Scanner(new File(fileName));
record = file.nextLine(); // discards the initial line of headers
while(file.hasNext())
// grab the next record and parse all its data
record = file.nextLine();
parse = new Scanner(record).useDelimiter(",");
date = parse.next();
itemID = parse.nextInt();
type = parse.next().toUpperCase().charAt(0);
units = parse.nextInt();
unitCost = parse.nextDouble();
transactionArray[logicalSize] = new Transaction(date, itemID, type, units, unitCost); // loads the current transaction into the array
logicalSize++;
return logicalSize;
}Thanks!
Oh, I guess I should also add that the variable input is a global variable of type Scanner.
static Scanner input = new Scanner(System.in); // reads input from keyboardMessage was edited by:
Kristofer.WardNow, I'm under the impression (and my teacher confirmed this) that arrays are
passed by reference.Java passes references to arrays by value.
So I'm assuming that by creating an array in my main method, passing it into
loadArray(), and changing the values within the method, all the data will be present
in the array within main without having to explicitly return the loaded array.Bearing in mind my statement above, what really happens is that a reference to
the array you created is passed to loadArray() by value. What I mean by that
last bit is that your loadArray() is free to assign a reference to a completely
different array to its argument variable and the caller will not notice the change.
That's what's happening here:public static int loadArray(Transaction[] transactionArray, int size) throws Exception
// declarations of local variables
* The argument variable is now assigned a reference to a completely
* new array. When this function returns the variable the caller used to
* invoke this method will have exactly the same value it did before this
* method was invoked. Ie it will *still* refer to an array of nulls.
transactionArray = new Transaction[size];
// more stuff - that involves changing the contents of
// the newly created array, not the one the caller has
// a reference to.
return logicalSize;
} -
Problem with bidim Array - increases to double why ? Anyone plz???
Hey , same problem but now its BETA version =P
So...the board woks fine just for one letter, but if i call it more than once...it will increase the number of line and columns..don't want that.. number of lines are 28 and columns are 48..it will have to insert the letter (any letters) inside that size lol ...he's not doin....what is wrong? :S
public class Tabuleiro {
public void drawboard(int x, int y, String letter){
String [][] h = new String[this.numLines+1][this.numColu+1];
for(int i =1; i != h.length; i++){
for(int j= 1; j != h.length; j++){
if (i == x && j == y) {
h[i][j] = " "+letter+" " ;
System.out.print(h[x][y]);
} else
System.out.print(h[i][j] = " . ");
System.out.println();
public static void main(String[] xxx){
Tabuleiro tabu = new Tabuleiro();
// String [][]y = new String[numLines][numColu];
tabu.drawboard(20, 40, "L");
tabu.drawboard(14, 10, "A");
tabu.drawboard(7,18,"P");
private final int numLines = 28;
private final int numColu = 48;
I think it could be easier if i create a method just for the board populated with "." and then if is it possible , create another method that receive 3 arguments ( x, y, letter) and insert them in the board ( is it possible to do that? ) one method only to the board ( that receive de number of lines and columns) and another method that call that board and receive those 3 arguments.
can i do that? how?
Anyone????
thanks
Message was edited by:
Java__Estudantepublic class Tabuleiro {
public void drawboard(int x, int y, String letter) {
for (int i = 0; i < h.length; i++) {
for (int j = 0; j < h.length; j++) {
if (i == x && j == y) {
h[i][j] = " " + letter + " ";
} else if (h[i][j] == null) {
h[i][j] = " . ";
public void printToConsole() {
// Try to figure out what to write here by using the field 'h'
// and methods: System.out.print() and System.out.println()
public static void main(String[] xxx) {
Tabuleiro tabu = new Tabuleiro();
tabu.drawboard(20, 40, "L");
tabu.drawboard(14, 10, "A");
tabu.drawboard(7, 18, "P");
tabu.printToConsole();
private final int numLines = 28;
private final int numColu = 48;
private final String[][] h = new String[numLines][numColu]; -
I am needing help on a inventory program for a class that was due a couple of days ago. The program needs to use an array to store items, output should display the value on the entire inventory, and use a method to calculate the inventory and sort the array items by name. This is one of the errors I am receiving.
72: incompatible types
found : Product[]
required: int[]
DVD = new Product [5];
Here is the code I have so far, thanks to any help anyone can provide.
import java.util.Scanner; //program uses Scanner
class DVD
private double itemNumber; // class variable that stores the item number
private double unitsInStock; // class variable that stores the number of units in stock
private double pricePerUnit; // class variable that stores price of each unit
private String nameOfDvd; //class variable for the name of DVD
public DVD() // Constructor for the DVD class
itemNumber = 0.0;
unitsInStock = 0.0;
pricePerUnit = 0.0;
nameOfDvd = "";
public void setitemNumber(double number) // Method to set the item number
itemNumber = number;
public double getitemNumber() // Method to get the item number
return itemNumber;
public void setunitsInStock(double units) // Method to set the units in stock
unitsInStock = units;
public double getunitsInStock() // Method to get the units in stock
return unitsInStock;
public void setpricePerUnit(double price) // Method to set the price per unit
pricePerUnit = price;
public double getpricePerUnit() //Method to get price per unit
return pricePerUnit;
public void setnameOfDvd(String name) // Method to set the name of DVD
nameOfDvd = name;
public double calculateInventoryValue() // Method to calculate inventory value
return unitsInStock * pricePerUnit;
}//end class DVD
public class Inventory2Array
// main methods begins execution of java application
public static void main( String args[])
// create Scanner to obtain input from command window
Scanner input = new Scanner( System.in );
// Instantiate product array
int[] DVD;
DVD = new Product [5];
// Instantiate objects for the array
DVD[0] = new Product("The Faculty", 1, 10, 10.00);
DVD[1] = new Product("Shaun of the Dead", 2, 10, 10.00);
DVD[2] = new Product("Spider Man 3", 3, 20, 20.00);
DVD[3] = new Product("House M.D. Season 3", 4, 10, 45.00);
DVD[4] = new Product("Clerks Special Edition", 5, 10, 25.00);
// Print out a screen title
System.out.printf("DVD Inventory\n\n");
// call the sort
Arrays.sort( inventory );
System.out.println( DVD.toString() );
for(j=0; j<3; ++j)
System.out.printf("Inventory %s Products $ %.2f\n\n\n",
inventory[j].getnameOfDvd(),
inventory[j].calculateInventoryValue() );
//display the inventory value
} // end main method
public static void sortProduct(Product[] inventory)
Product temp = new Product();
int i, j;
for (i=1; i < inventory.length; i++)
for (j=0; j < inventory.length-i; j++)
if (inventory[j].getnameOfDvd().compareTo(inventory[j+1].getnameOfDvd())>0)
// exchange elements
temp = inventory[j];
inventory[j] = inventory[j+1];
inventory[j+1] = temp;
}I see what you mean. Can you tell me if I am on the right track with my code, I am receiving an error that states "cannot find symbol Arrays.sort(dvds); here is my code:
{code}import java.util.Scanner; //program uses Scanner
class DVD
private double itemNumber; // class variable that stores the item number
private double unitsInStock; // class variable that stores the number of units in stock
private double pricePerUnit; // class variable that stores price of each unit
private String nameOfDvd; //class variable for the name of DVD
public DVD() // Constructor for the DVD class
itemNumber = 0.0;
unitsInStock = 0.0;
pricePerUnit = 0.0;
nameOfDvd = "";
public void setitemNumber(double number) // Method to set the item number
itemNumber = number;
public double getitemNumber() // Method to get the item number
return itemNumber;
public void setunitsInStock(double units) // Method to set the units in stock
unitsInStock = units;
public double getunitsInStock() // Method to get the units in stock
return unitsInStock;
public void setpricePerUnit(double price) // Method to set the price per unit
pricePerUnit = price;
public double getpricePerUnit() //Method to get price per unit
return pricePerUnit;
public void setnameOfDvd(String name) // Method to set the name of DVD
nameOfDvd = name;
public double calculateInventoryValue() // Method to calculate inventory value
return unitsInStock * pricePerUnit;
}//end class DVD
class Inventory2Array
// main methods begins execution of java application
public static void main( String args[])
// create Scanner to obtain input from command window
Scanner input = new Scanner( System.in );
// Instantiate product array
Product [] dvds;
dvds = new Product [5];
// Instantiate objects for the array
dvds[0] = new Product("The Faculty", 1, 10, 10.00);
dvds[1] = new Product("Shaun of the Dead", 2, 10, 10.00);
dvds[2] = new Product("Spider Man 3", 3, 20, 20.00);
dvds[3] = new Product("House M.D. Season 3", 4, 10, 45.00);
dvds[4] = new Product("Clerks Special Edition", 5, 10, 25.00);
// Print out a screen title
System.out.printf("DVD Inventory\n\n");
// call the sort
Arrays.sort(dvds);
System.out.println(dvds);
public class InventoryProgram1
//main method begins execution of Java
public static void main (String args [])
//create Scanner to obtain input from command window
Scanner input = new Scanner (System.in);
double itemNumber = 0.0; // variable that stores the item number
double unitsInStock = 0.0; // variable that stores the units in stock
double pricePerUnit = 0.0; // variable that stores the price per unit
double InventoryValue = 0.0; // variable that stores inventory value
String nameOfDvd = ""; // DVD name
//create InventoryProgram1 object and assign to myInventoryProgram1
InventoryProgram1 myInventoryProgram1 = new InventoryProgram1 ();
System.out.print ("Item Number:\n");
System.out.print("DVD Name:\n");
System.out.print("Units In Stock:\n");
System.out.print("Price Per Unit:\n");
InventoryValue = unitsInStock * pricePerUnit; // calculate inventory value
System.out.println("Inventory Value: $100.00\n"); // display inventory value
{code} -
Problem with instantiating array
Hi, so my problem is 2 fold :)
First off, here are my constructors:
public class ArrayBag implements BagADT<Object> {
public Object[] bag;
private int bagSize = size();
public ArrayBag() {
bag = new Object[100];
public ArrayBag(int c) {
if (c >= 0) {
bag = new Object[c];
}For some reason, netbeans doesnt recognize that the bag has been instantiated unless i change it to Object arrayBag[] = new Object[100] all on the same line.. I wrote a tester program which so far consists of arrayBag(100); and yeah...i get a null pointer error which poitns at the following method:
public int size() {
int count = 0;
while (count < bag.length && bag[count] != null) {
count++;
}//end while
return count;
} The error directly points at the line containing the while statment...But if i DO change the instantiation to a single line, then this error doesnt happen. Im sure that these errors are interconnected with one and other...just unsure how to fix them.
Thanks!
Paul
Edited by: Toadums on Jan 20, 2009 6:07 PMah of course! Thanks!
I do have another question though.
So what my teacher did...he sent the part of the code which he wrote as a class file...we had to import it into the library and all that jazz...when i try to run my program i get some lines of errors:
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object;
at MemoryGame.init(MemoryGame.java:128)
at MemoryGame.<init>(MemoryGame.java:57)
at MemoryGame.main(MemoryGame.java:47)
Java Result: 1like that....and im just wondering, since i cant look at the code that he gave us...how am i supposed to test, cause im not sure where the error is O.o -
Hello
I don't know how to iniatialize an array of a specific class (Myclass1):
public class Myclass2
Myclass1 m[] ;
public Myclass2()
Myclass1 m[] =new Myclass1() ;
// I think it's wrong but the problem is that i don't have the array
// size so i can't write :
// for (int i=0;i<m.length;i++) {Myclasse1 m[i] = new Myclass1() ;}
If you ve got an idea or advices can you tell me please .Thank for your help.I don't know how to iniatialize an array of a specificTo Initialize an Object array, you would use the same declaration as any other array..
Myclass1 m[] =new Myclass1[0];
or
Myclass1 m[] =new Myclass1[10];
// I think it's wrong but the problem is that i don't
have the array
// size so i can't write :If you do not know the array size you could use an ArrayList or some other data structure(http://java.sun.com/j2se/1.4/docs/api/java/util/package-summary.html) and later convert that data structure to Array. -
Problem with byte array arguments in webservice method call
I am using JWSDP 1.5 to generate client stubs for a webservice hosted on a Windows 2000 platform.
One of the methods of the webservice contains a byte array argument. When our application calls this method passing the contents of a TIFF file as the byte array, the method is failing. I have discovered that tthe reason for the failure is that the byte array in the SOAP message has been truncated and is missing its terminating tag.
Is this a known problem in JWSDP 1.5? Is there a fix for it? Does JWSDP 1.6 resolve this problem?
Any assistance will be much appreciated.
Regards,
LeoI'd like to add the the webservice being invoked by the generated client stubs is rpc/encoded.
-
Problem with Assocaite Array & Bulk Collect
Hi All,
I encountered compilation error when I executed the following block. Improper reference of elements in associate array ( at var.party_name (r) in the code ) is giving problems. Please help me in correcting it.
Regards,
Kashif
DECLARE
TYPE record1 IS RECORD (
party_name racsf_cust_pre_staging_int.party_name%TYPE,
shipping_address_1 racsf_cust_pre_staging_int.shipping_address_1%TYPE,
cust_acct_site_id racsf_cust_pre_staging_int.cust_acct_site_id%TYPE
TYPE typ_cust_pre_staging_int IS TABLE OF record1
INDEX BY BINARY_INTEGER;
var typ_cust_pre_staging_int;
BEGIN
SELECT party_name,
shipping_address_1,
cust_acct_site_id
BULK COLLECT INTO var
FROM racsf_cust_pre_staging_int;
FORALL r IN var.FIRST .. var.LAST
UPDATE racsf_cust_pre_staging_int
SET party_name = var.party_name (r),
shipping_address_1 = var.shipping_address_1 (r)
WHERE cust_acct_site_id = var.cust_acct_site_id (r);
END;I thought if i collect BULK collect and update all records, it will avoid context switching b/w SQL & PL/SQL engines and decrease the execution time.Right idea to get rid of FOR loop
But if you can do in a single SQL statement and avoid collections that is best.
How many records in the collection?
Use LIMIT if necessary as already mentioned - 500 to 1000 might be a sensible limit
I believe this is representative of your current error (I'm using insert and new table for simplicity):
SQL> create table t
2 (col1 number
3 ,col2 number);
Table created.
SQL>
SQL> declare
2 cursor c_t
3 is
4 select rownum col1, rownum col2
5 from dual
6 connect by rownum <= 10000;
7 type tt_t is table of t%rowtype index by pls_integer;
8 v_t tt_t;
9 begin
10 open c_t;
11 loop
12 fetch c_t bulk collect into v_t limit 1000;
13 exit when v_t.count = 0;
14 forall i in 1 .. v_t.count
15 insert into t
16 (col1,col2)
17 values
18 (v_t.col1(i), v_t.col2(i));
19 end loop;
20 end;
21 /
(v_t.col1(i), v_t.col2(i));
ERROR at line 18:
ORA-06550: line 18, column 14:
PLS-00302: component 'COL1' must be declared
ORA-06550: line 18, column 27:
PLS-00302: component 'COL2' must be declared
ORA-06550: line 18, column 27:
PLS-00302: component 'COL2' must be declared
ORA-06550: line 18, column 23:
PL/SQL: ORA-00904: "V_T"."COL2": invalid identifier
ORA-06550: line 15, column 9:
PL/SQL: SQL Statement ignored
SQL> If you change to the following you will run into PLS-00436 - a right PITA.
SQL> declare
2 cursor c_t
3 is
4 select rownum col1, rownum col2
5 from dual
6 connect by rownum <= 10000;
7 type tt_t is table of t%rowtype index by pls_integer;
8 v_t tt_t;
9 begin
10 open c_t;
11 loop
12 fetch c_t bulk collect into v_t limit 1000;
13 exit when v_t.count = 0;
14 forall i in 1 .. v_t.count
15 insert into t
16 (col1,col2)
17 values
18 (v_t(i).col1, v_t(i).col2);
19 end loop;
20 end;
21 /
(v_t(i).col1, v_t(i).col2);
ERROR at line 18:
ORA-06550: line 18, column 10:
PLS-00436: implementation restriction: cannot reference fields of BULK In-BIND table of records
ORA-06550: line 18, column 10:
PLS-00382: expression is of wrong type
ORA-06550: line 18, column 23:
PLS-00436: implementation restriction: cannot reference fields of BULK In-BIND table of records
ORA-06550: line 18, column 23:
PLS-00382: expression is of wrong type
ORA-06550: line 18, column 10:
PL/SQL: ORA-22806: not an object or REF
ORA-06550: line 15, column 9:
PL/SQL: SQL Statement ignoredFor workarounds other than using single arrays per column, see Adrian Billington's article here:
http://www.oracle-developer.net/display.php?id=410
Easiest solution is one array per column:
SQL> declare
2 cursor c_t
3 is
4 select rownum col1, rownum col2
5 from dual
6 connect by rownum <= 10000;
7 type tt_t1 is table of t.col1%type index by pls_integer;
8 type tt_t2 is table of t.col2%type index by pls_integer;
9 v_t1 tt_t1;
10 v_t2 tt_t2;
11 begin
12 open c_t;
13 loop
14 fetch c_t bulk collect into v_t1,v_t2 limit 1000;
15 exit when v_t1.count = 0;
16 forall i in 1 .. v_t1.count
17 insert into t
18 (col1,col2)
19 values
20 (v_t1(i), v_t2(i));
21 end loop;
22 end;
23 /
PL/SQL procedure successfully completed.
SQL> Best solution would have been a single piece of SQL:
SQL> insert into t
2 (col1,col2)
3 select rownum col1, rownum col2
4 from dual
5 connect by rownum <= 10000
6 /
10000 rows created.
SQL>
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