Stupid ArrayLists... or is it me?!
I have this code in my enqueue class:
int newNode = (_queue.size() + 1);
_queue.ensureCapacity( newNode );
_queue.add( newNode, node );
node is my own node class and queue is defined as ArrayList queue = new ArrayList();
I'm getting a runtime error saying I'm out of bounds:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
at java.util.ArrayList.add(ArrayList.java:367)
at MinBinaryHeapPriorityQueue.enqueue(MinBinaryHeapPriorityQueue.java:82)
How can I resize the ArrayList? I thought it did that automatically? I have to use ArrayList, so no other DTs or Classes.
Anyone? I've tried changing just about everything. newNode, and ensureCapacity(+alot), I've even constructed ArrayList with (100).
I've also tried taking the ensureCapacity line out and get the same thing... Any thing else that could help?
NOMAD
int newNode = (_queue.size() + 1);
_queue.ensureCapacity( newNode );The indexes of an ArrayList start at 0 so here
_queue.add( newNode, node );you are trying to add an element at an index beyond the limit of your list.
The line should be:
_queue.add(newNode - 1, node);
or
queue.add(queue.size(), node);
And the above is the same as:
_queue.add(node);
Similar Messages
-
Hi,
I'm trying to read a CSV text file into an arraylist.
I can read the text file fine, its just when it gets to the actual arraylist.add() part it just .. .. doesn't work. It can print the values from the CSV file no problem. I'm sure my syntax is fine, everything compiles. I've read it and double checked it and checked it again.
It just doesn't work .. I don't know why.
The arraylist I am trying to read into is
ArrayList<Customer> customers = new ArrayList<Customer>();Within other parts of the program I can read in dummy data, eg
customers.add(new Customer(01, "Jims Mowing", "16 Long Grass Street", "Thorndale", "123-4567", "[email protected]"));
but suffice to say, yes, it is kaput.
* READING THE CUSTOMER TEXT FILE INTO THE ARRAY LIST
private void custFileToArray ()
RectangleTUI results = new RectangleTUI(); // create results object
try
BufferedReader inputStream = new BufferedReader(new FileReader(PATHNAME + CUSTFILE));
System.out.println("Contents of file: " + CUSTFILE); // print heading
String line = inputStream.readLine(); // read first line
while (line !=null) // test for end of file (EOF)
results.loadCustFile(line);
line = inputStream.readLine(); // read next line
// close file
inputStream.close();
// catch any file open errors
catch(FileNotFoundException e)
System.out.println("Error opening file: " + CUSTFILE);
System.exit(0);
catch(NoSuchElementException e)
System.out.println("ATTENTION: One or more " + CUSTFILE + " records are missing data");
// catch any file reading errors
catch(IOException e)
System.out.println("Error reading from file: " + CUSTFILE);
System.exit(0);
System.out.println("File Reading Complete");
private void loadCustFile(String textLine)
String delimiters = ","; // set tokenizer delimiter
StringTokenizer RecordFields = new StringTokenizer(textLine,delimiters);
int cidNum = Integer.parseInt(RecordFields.nextToken()); // Customer ID
System.out.println(cidNum + " Hello I am a stupid piece of code. I don't like to work properly");
String cName = RecordFields.nextToken(); // Name
String cAdd = RecordFields.nextToken(); // Street Address
String cBurb = RecordFields.nextToken(); // Suburb
String cPhone = RecordFields.nextToken(); // Phone
String cEmail = RecordFields.nextToken(); // Email
customers.add(new Customer(cidNum, cName, cAdd, cBurb, cPhone, cEmail));
}Cowzor wrote:
Hi,
Cheers for the replies & the printStackTrace tip.
The thing is it's not actually throwing up any errors or crashing. It's acting as if everything is AOK - but since it then says there's nothig in the arraylist there must be a problem ... somewhere.
Sorry if I've mis-understood what you were saying
Here's the dummy data I'm using just incase it's at all relevant
200701,Jims Mowing,16 Long Grass Street,Thorndale,123-4567,[email protected]
200702,Chevy Racers,2 Raceway Drive,Boganville,123-4567,[email protected]
200703,Renta Dent,82 Airport Oaks Road,Airport Oaks,123-4567,[email protected]
200704,Discount Taxis,8 Poor Place,Otara,123-4567,[email protected]
u split contains of CSV file on basis of , (comma) and read it -
Parameterized ArrayList in 1.5 but not in 1.4
I've been doing a lot of reading on the discussion about JDK 1.5 and JDK 1.4 here. I think I've dug myself into a hole that will be very hard to get out of. And yes, it's my fault, but this is my first time developing a real J2EE application... sigh.
Here's the problem: I have 3 months' of work written and compiled using JDK 1.5. The Tomcat server we run (that can NOT be modified) uses JDK 1.4. I stupidly did not bother finding that out before I wrote all this code. I've analyzed my code, and the only thing that does not compile is parameterization. I use Hashtables, ArrayLists, etc etc. Those two actually account for over 60% of my data structures.
In 1.5 ArrayList<String, String[]> was acceptable. This is not true in 1.4. I may have to resort to rewriting this code. But I am hoping there is another solution. Does anybody know what I can do, perhaps write my own data structure that can be parameterized in 1.4? Or is there something else I can use?
Thanks for the feedback.. and you may have to give me examples, I'm just a beginner heh.If you're still struggling with this, check out Retroweaver.
I don't read this forum very often (like, once a month or something) so I'm unlikely to reply if you have any other queries.
But I'll happily accept your dukes! :-) -
Get values out of multidimensional arrayList
I hope somebody can help me. I am writing a java servlet with jsps of a supervisor calendar showing the current month plus 12 months, marking the days that people have scheduled vacation. I have the data loaded into the arrayList, but am having trouble getting it back out to display on the relevant dates of the calendar.
My jsp is successfully calling this ArrayList:
ArrayList empPriorPto = (ArrayList)session.getAttribute("empPriorPto");
which gives me these values (they will of course change sizes in real life):
empPriorPto=[[PtoDay: empId = 50514, ptoDate = 2010-6-12, ptoType = P, ptoLength = 1.0]]
empPriorPto=[[]]
empPriorPto=[[PtoDay: empId = 197, ptoDate = 2010-7-23, ptoType = P, ptoLength = 1.0]]I need to put this in a loop of months such as (condensed here, but I think you can get the idea):
for (int days=1; days <= daysInMonth; days++) {
if(empPriorPto != null) {
for(int i=0; i < empAndrewIdList.size(); i++){
ArrayList empPriorPto = new ArrayList();
empPriorPto.add(ptoDAO.findPtoFromToday((String) empAndrewIdList.get(i)));
session.setAttribute("empPriorPto", empPriorPto);
for(int k = 0; k < empPriorPto.size(); k++ ){
ArrayList p =(ArrayList)empPriorPto.get(k);
System.out.println("p="+p.get(k).toString());
} // close i < empPriorPto.size()
} //close if != null p.get(k).toString() gives me this:
p=PtoDay: empId = 50514, ptoDate = 2010-6-13, ptoType = P, ptoLength = 1.0which doesn't help. I need something like empPriorPto.ptoDays.getPtoDate().compareTo, but can't find anything..
I have searched for alternatives, but the best answer I found uses a newer jdk than I have, I believe I have 1.4 and when I tried it I got an error that says I need 1.5.
Sorry for being so stupid. Any help would be appreciated.This is what I have now, which is working, but only for the first person in the array. It is giving me all their vacation, but not moving on to the next person. Sorry for the formatting, it's difficult to get them lined up.:
for (int days=1; days <= daysInMonth; days++) {
if(empPriorPto != null) {
for(int k = 0; k < empPriorPto.size(); k++ ){
ArrayList p =(ArrayList)empPriorPto.get(k);
if(pointer < p.size() ){
PtoDay ptoDays = (PtoDay)p.get(pointer);
if(ptoDays.getPtoDate().compareTo(showCal.get(Calendar.YEAR)+"-"+showCal.get(Calendar.MONTH)+"-"+showCal.get(Calendar.DATE))==0){ %>
<th class=calendar><%=days%>NEED EMPLOYEE NAME HERE
<% pointer++;
}else { %>
<th class=calendar><%=days%>
<% }
}else { %>
<th class=calendar><%=days%>
<% }
} // close k < empPriorPto.size()
} else { %>
<th class=calendar><%=days%>
<% } %> -
Get Object[] length in ArrayList
How do I get the size of the Object[] in ArrayList?
Not ArrayList.size() which returns how many Elements
are in the List.You could use reflection if you really wanted to know
how much memory you have "wasted".
KajHere's a stupid class to do just that.
Thanks.
import java.util.*;
import java.lang.reflect.*;
public class Test{
public static void main(String[] args){
new Test();
public Test(){
List list = new ArrayList(1);
double capacity = 0;
double size = 0;
Random rand = new Random();
int iter = rand.nextInt(100);
System.out.println("Iter: " + iter);
for(int i = 0; i < iter; i++){
int rn = rand.nextInt(10);
Integer integer = new Integer(rn);
list.add(integer);
size = list.size();
System.out.println("List Size: " + size);
try{
Class al = list.getClass();
// Get Declared Fields
System.out.println("\nGet Declared Fields");
Field[] fields1 = al.getDeclaredFields();
for(int i = 0; i < fields1.length; i++){
System.out.println("Field: " + fields1.getName());
// Get Fields
System.out.println("\nGet Fields");
Field[] fields2 = al.getFields();
for(int i = 0; i < fields2.length; i++){
System.out.println("Field: " + fields2[i].getName());
// Get Field
System.out.println("\nGet Field");
//Field field = al.getField("elementData");
Field field = fields1[1];
field.setAccessible(true);
System.out.println("Field (elementData): " + field.getName());
Object obj = field.get(list);
Object[] elementData = (Object[])obj;
capacity = elementData.length;
} catch(Exception e){
e.printStackTrace();
System.out.println("List Capacity: " + capacity);
int percentOver = (int)(((capacity - size) / capacity) * 100);
System.out.println("Percent Over: " + percentOver); -
Why the new playbook 2.0 os doesn't support asian languages again? so stupid!
i found the new 2.0 os is not supporting any of the asian languages such as chinese, japanese text again... so stupid, what rim has in mind for marketing direction?
If I read Neal Gafters article right, the migration compatibilty is this:
Point 4 would have been possible, but then every core class that is generic now, would have to be a new class with the same functionality.
So when you used to use new ArrayList(), if you want to use generics you would have to use new GenericArrayList<String>();.
It is a different class from ArrayList and which would be reified (sp?) to a new StringArrayList() (generated) class by the compiler.
So if you have a library with a method which used to except a List as parameter, your new generic version of the library would now require a GenericList insetad. Someone who uses your library cannot just drop in your new version without changing all his Lists to GenericLists.
With erasure he can, but gets type safety warning instead, fixable by only adding the generic type to his lists (new ArrayList() to new ArrayList<String>()). -
ArrayList e .RangeCheck(int)line 546
Hi guys I am working on this project
in few word
I have to draw different shape on a panel
moreover when two similar shapes collide ( 2 circles ) they make a bigger circle
when st change direction
almost everything works
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Iterator;
import javax.swing.JPanel;
class ShapePanel extends JPanel implements ActionListener {
private static final long serialVersionUID = 1L;
public static ArrayList <Shape>shapes;
private javax.swing.Timer animationTmr;
int speed;
PlaySound audioClip = new PlaySound();
private float heigth;
private float width;
private int shape1;
private int shape2;
public ShapePanel() {
shapes = new ArrayList<Shape>();
animationTmr = new javax.swing.Timer(80, this); //interval, ActionListener
animationTmr.start();
public ArrayList<Shape> getShapes()
return shapes;
public void addSquare(int x, int y,int w,int h, int shapeType) {
shapes.add(new Square(this,x, y,width, heigth, shapeType));
repaint();
System.out.println(shapes.size());
public void addCircle(int x, int y,int w,int h, int shapeType) {
shapes.add(new Circle(this, x, y,width, heigth, shapeType));
repaint();
System.out.println(shapes.size());
public void addRectangle(int x, int y,int w,int h, int shapeType) {
shapes.add(new Rectangle(this, x, y,width, heigth, shapeType));
repaint();
System.out.println(shapes.size());
public void addStar(int x, int y,int w,int h, int shapeType) {
shapes.add(new Star(this, x, y,width, heigth, shapeType));
repaint();
System.out.println(shapes.size());
public void paintComponent(Graphics g) { //called Whenever panel needs
super.paintComponent(g); //re-displaying:
Iterator<Shape> it = shapes.iterator(); //Iterate through Balls calling
g.setColor(Menu.getColor());
g.fillRect(0, 0, this.getWidth(), this.getHeight());
while (it.hasNext()) { //each one's paint method
it.next().paint(g);
public void actionPerformed(ActionEvent ev) {
//On timer tick,
Iterator<Shape> it = shapes.iterator(); //Iterate through Balls calling
while (it.hasNext()) { //each one's updatePos() method
it.next().updatePos();
checkTypeCollision();
handleCollision();
repaint();
private void checkTypeCollision()
//we iterate through all the balls, checking for collision
for(int i=0;i<shapes.size();i++)
for(int j=0;j<shapes.size();j++)
if(i!=j)
if(collide(shapes.get(i), shapes.get(j)))
shape1=shapes.get(i).shapeType;
shape2=shapes.get(j).shapeType;
if(shape1==shape2)
/* int newX = (int) ((shapes.get(i).getCenterX() + (shapes.get(j).getCenterX()/2))/2);
int newY = (int) ((shapes.get(i).getCenterY() + (shapes.get(j).getCenterY() /2))/2);
float newWidth = shapes.get(i).getWidth()+(shapes.get(j).getWidth()/2);
float newHeigth = shapes.get(i).getHeigth()+(shapes.get(j).getHeigth()/2);
int newShapeType = shapes.get(i).shapeType;
if(shapes.get(i).getShapeType()==1)
shapes.remove(j); //remove shape element at j
shapes.remove(i); //remove shape element at j
System.out.println("SIZE IS==="+ shapes.size());
System.out.println("newx====="+newX);
System.out.println("newy====="+newY);
System.out.println("newWidth====="+newWidth);
System.out.println("newx====="+newHeigth);
// shapes.add(new Rectangle(this,newX,newY,530,530,newShapeType));
System.out.println("SIZE IS==="+ shapes.size());
// repaint();
if(shapes.get(i).getShapeType()==2)
shapes.remove(j); //remove shape element at j
shapes.remove(i); //remove shape element at j
// shapes.add(new Circle(this,newX,newY,newWidth,newHeigth,newShapeType));
// repaint();
if(shapes.get(i).getShapeType()==3)
shapes.remove(j); //remove shape element at j
shapes.remove(i); //remove shape element at j
shapes.add(new Square(this,newX,newY,newWidth,newHeigth,newShapeType));
if(shapes.get(i).getShapeType()==3)
shapes.remove(j); //remove shape element at j
shapes.remove(i); //remove shape element at j
//shapes.add(new Star(this,newX,newY,newWidth,newHeigth,newShapeType));
// repaint();
private void handleCollision()
//we iterate through all the balls, checking for collision
for(int i=0;i<shapes.size();i++)
for(int j=0;j<shapes.size();j++)
if(i!=j)
if(collide(shapes.get(i), shapes.get(j)))
shapes.get(i).hit(shapes.get(j));
shapes.get(j).hit(shapes.get(i));
boolean collide(Shape b1, Shape b2)
double wx=b1.getCenterX()-b2.getCenterX();
double wy=b1.getCenterY()-b2.getCenterY();
//we calculate the distance between the centers two
//colliding balls (theorem of Pythagoras)
double distance=Math.sqrt(wx*wx+wy*wy);
if(distance<b1.shapeSize)
audioClip.playRectangle();
return true;
else return false;
public static int vectorSize()
return shapes.size();
}the drawing stops and
i have this error after a while
arrayList<e>.RangeCheck(int)line 546
moreover it doesn t draw a bigger shape as i want with the line
shapes.add(new Circle(this,newX,newY,newWidth,newHeigth,newShapeType));
help please the deadline is Tomorrow;Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 4, Size: 4
at java.util.ArrayList.RangeCheck(ArrayList.java:546)
at java.util.ArrayList.get(ArrayList.java:321)
at ShapePanel.checkTypeCollision(ShapePanel.java:156)
at ShapePanel.actionPerformed(ShapePanel.java:77)
at javax.swing.Timer.fireActionPerformed(Timer.java:271)
at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
it doesn t compile because is part of a bigger project -
Check for null and empty - Arraylist
Hello all,
Can anyone tell me the best procedure to check for null and empty for an arraylist in a jsp using JSTL. I'm trying something like this;
<c:if test="${!empty sampleList}">
</c:if>
Help is greatly appreciated.
Thanks,
Greeshma...A null check might not be you best option. If your requirement is you must have both the date and time component supplied in order to populate EventDate, then I would use a Script Functoid that takes data and time as parameters.
In the C# method, first check if either is an empty string, if so return an empty string.
If not, TryParse the data, if successful, return a valid data string for EventDate. If not, error or return empty string, whichever satsifies the requirement. -
Problem getting arraylist values from request
Hi All,
I am trying to display the results of a search request.
In the jsp page when I add a scriplet and display the code I get the values else it returns empty as true.Any help is appreciated.
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<%@ include file="/includes/header.jsp"%>
<title>Research Results</title>
</head>
<body>
<div class="ui-widget ui-widget-content">
<%
ArrayList<Research> research = (ArrayList<Research>) request.getAttribute("ResearchResults");
Iterator iterator = research.iterator();
while(iterator.hasNext()){
Research r = (Research) iterator.next();
out.println("Result Here"+r.getRequesterID());
out.println("Result Here"+r.getStatus());
%>
<form>
<c:choose>
<c:when test='${not empty param.ResearchResults}'>
<table cellspacing="0" cellpadding="0" id="research" class="sortable">
<h2>RESEARCH REQUESTS</h2>
<tr>
<th><a href="#">RESEARCH ID</a></th>
<th><a href="#">REQUESTOR NAME</a></th>
<th><a href="#">DUE DATE</a></th>
<th><a href="#">REQUEST DATE</a></th>
<th><a href="#">CLIENT</a></th>
<th><a href="#">STATUS</a></th>
<th><a href="#">PRIORITY</a></th>
</tr>
<c:forEach var="row" items="${param.ResearchResults}">
<tr title="">
<td id="researchID">${row.RESEARCH_ID}</td>
<td>${row.REQUESTER_FNAME} ${row.REQUESTER_LNAME}</td>
<td><fmt:formatDate pattern="MM/dd/yyyy" value="${row.DUE_DATE}"/></td>
<td><fmt:formatDate pattern="MM/dd/yyyy" value="${row.CREATED_DATE}"/></td>
<td>${row.CLIENT}</td>
<td>
<c:choose>
<c:when test="${row.STATUS=='10'}">New Request</c:when>
<c:when test="${row.STATUS=='20'}">In Progress</c:when>
<c:when test="${row.STATUS=='30'}">Completed</c:when>
</c:choose>
</td>
<td>
<c:choose>
<c:when test="${row.PRIORITY=='3'}">Medium</c:when>
<c:when test="${row.PRIORITY=='2'}">High</c:when>
<c:when test="${row.PRIORITY=='1'}">Urgent</c:when>
</c:choose>
</td>
</tr>
</c:forEach>
</table>
</c:when>
<c:otherwise>
<div class="ui-state-highlight ui-corner-all">
<p><b>No results Found. Please try again with a different search criteria!</b> </p>
</div>
</c:otherwise>
</c:choose>
</form>
<%@ include file="/includes/footer.jsp"%>
</div>
</body>
</html>What is ResearchResults?
Is it a request parameter or is it a request attribute?
Parameters and attributes are two different things.
Request parameters: the values submitted from the form. Always String.
Request attributes: objects stored into scope by your code.
They are also accessed slightly differently in EL
java syntax == EL syntax
request.getParameter("myparameter") == ${param.myparameter}
request.getAttribute("myAttribute") == ${requestScope.myAttribute}
You are referencing the attribute in your scriptlet code, but the parameter in your JSTL/EL code.
Which should it be?
cheers,
evnafets -
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]
3
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) -
How can I move an ArrayList from one method to another?
As the subject reveals, I want to know how I move an ArrayList. In one method, I fill my ArrayList with objects, and in the next I want to pick an arbitrary object out of the ArrayList.
How do I make this work??You pass the same array list to both the method. Both method are getting the same thing.
void main(){
//create array list here
ArrayList aList = new ArrayList();
//pass it to a method to fill items
fillArrayList(aList);
//pass the same arraylist to another method
printArrayList(aList);
void fillArrayList(ArrayList list){
list.add("A");
void printArrayList(ArrayList list){
//The array list will contain A added by the previos method
System.out.println(list);
FeedFeeds : http://www.feedfeeds.com -
Create a JTable based on an ArrayList containing instances of a class.
I have a class, IncomeBudgetItem, instances of which are contained in an ArrayList. I would like to create a JTable, based on this ArrayList. One variable is a string, while others are type double. Not all variables are to appear in the JTable.
The internal logic of my program is already working. And my GUI is largely constructed. I'm just not sure how to make them talk to each other. The actually creation of the JTable is my biggest problem right now.import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
public class TableDemo extends JPanel {
private boolean DEBUG = false;
public TableDemo() {
super(new GridLayout(1, 0));
ArrayList<MyObject> list = new ArrayList<MyObject>();
list.add(new MyObject("Kathy", "Smith", "Snowboarding", new Integer(5),
new Boolean(false)));
list.add(new MyObject("John", "Doe", "Rowing", new Integer(3),
new Boolean(true)));
list.add(new MyObject("Sue", "Black", "Knitting", new Integer(2),
new Boolean(false)));
list.add(new MyObject("Jane", "White", "Speed reading",
new Integer(20), new Boolean(true)));
JTable table = new JTable(new MyTableModel(list));
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
// Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
// Add the scroll pane to this panel.
add(scrollPane);
class MyObject {
String firstName;
String lastName;
String sport;
int years;
boolean isVeg;
MyObject(String firstName, String lastName, String sport, int years,
boolean isVeg) {
this.firstName = firstName;
this.lastName = lastName;
this.sport = sport;
this.years = years;
this.isVeg = isVeg;
class MyTableModel extends AbstractTableModel {
private String[] columnNames = { "First Name", "Last Name", "Sport",
"# of Years", "Vegetarian" };
ArrayList<MyObject> list = null;
MyTableModel(ArrayList<MyObject> list) {
this.list = list;
public int getColumnCount() {
return columnNames.length;
public int getRowCount() {
return list.size();
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
MyObject object = list.get(row);
switch (col) {
case 0:
return object.firstName;
case 1:
return object.lastName;
case 2:
return object.sport;
case 3:
return object.years;
case 4:
return object.isVeg;
default:
return "unknown";
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("TableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
TableDemo newContentPane = new TableDemo();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
} -
Help :add multiple rows from Resultset to ArrayList ?
My query returns one column and multiple rows. In Java code , I am trying to get this data in array or arraylist through ResultSet
ex:
item_num
p001
p002
p003
when I print, it only gets the item in the first row.
ArrayList myArrayList = new ArrayList();
resultset = preparedstatement.executeQuery();
if (resultset.next())
myArrayList.add(new String(resultset.getString("item_num")));
Print:
for (int j = 0 ; j < myArrayList.size() ; j++ )
System.out.println((String)myArrayList.get(j)); --this prints only the first item.
can someone assist ?changing if to while fixed it.
-
Where are my photos on the PC after synching with an iphone? I know nobody out there is stupid enough to suggest to me that they are encrypted and inaccessible, right? Seriously? How stupid would Apple corporation have to be to do something like this? That would be just as foolish as making my music unusable on the PC...
Okay, Let's assume that Apple is indeed THAT foolish.......How does one get the photos from the phone to the PC and still use them?The photos are still on your phone, and if enabled in your Photo Stream. They are not automatically transferred to your computer when syncing.
See iOS: Import personal photos and videos from iOS devices to your computer and iCloud: My Photo Stream FAQ
tt2 -
How to modify numbers in a arraylist?
Say I have an arraylist with these values:
[item1, 65, 555.5]item1 represents the name of an item type, 65 represents the number in stock, and 555.5 represents the value of one item.
Now say I want to add 10 item1's to the number in stock. So I want to change the 65 in the array list to a 75. How could I do this?
ThanksThis would be a lot easier if you created a class to encapsulate those three data members, then created a list of those objects. The class could have three variables, name, stock, and value. Then it's easy to write a method to add or subract to the stock of a particular item, and you don't have to worry about modifying the wrong element in the list, casting elements to the right type (String, int, float, etc).
public class Item {
private String name;
private int stock;
private float value;
}
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