Display And Resize Multiple Rectangles Independently - Using Objects From ArrayList

Jan 13, 2014

I have a code to resize a single rectangle. I would like to display and resize multiple rectangles independently and according to my research on the net, the best way is to use an arraylist. So I modified the code in this sense, except ...when I run the code, the rectangles appear good but impossible to resize. I think the problem comes from mousePressed, Released, Dragged and Moved methods. When I use the mouse to resize the rectangle, nothing happens. The code does not interact with the arraylist, and therefore with rectangles it "contains". Resizing is my main class, the MouseAdapter is in the Resizer class (below).

Resizing component;      boolean dragging = false;      // Give user some leeway for selections.     
final int PROX_DIST = 3;      Path2D.Double selectedPath;        public Resizer(Resizing rz) {         
component = rz;          component.addMouseListener(this);         
component.addMouseMotionListener(this);     

[Code] .....

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Resize Objects From ArrayList

Jan 9, 2014

I have a problem with my program. My aim is to display in a JPanel, 2 rectangles, and resize them by clicking. I want to give the user the ability to change the height of the rectangles (independently) by moving the top and/or bottom edges. Currently, it displays the 2 rectangles, but impossible to resize and I can not find the solution.

Java Code:

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import javax.swing.*;
public class Resizing extends JPanel {
private static final int PREF_W = 600;

[Code]...

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Swing/AWT/SWT :: Resize Objects From ArrayList

Jan 10, 2014

I have a problem with my program. My aim is to display in a JPanel, 2 rectangles from an arraylist, and resize them by clicking. I want to give the user the ability to change the height of the rectangles (independently) by moving the top and/or bottom edges. There is errors in my code but where ? Netbeans underlines 2 lines (in bold).

My code:

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Path2D;

[Code]....

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Servlets :: How To Handle Request Independently For All Users

Oct 11, 2014

How is this possible? Here is the servlet page.

/**
* Servlet implementation class InvoicingDeptServlet
*/
@WebServlet("/InvoicingDeptServlet")
public class InvoicingDeptServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
//Make arraylist global object
ArrayList<InvoiceData> invoiceList = new ArrayList<InvoiceData>();

[Code] ....

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Compare All Objects In ArrayList To All Others But Not Self

Mar 15, 2015

I have a ArrayList of objects of class called HockeyPlayer (ArrayList<HockeyPlayer>). A HockeyPlayer has a String name and int number of goals.

This is my current work for comparing each object in the list to every other and printing them to screen:

Iterator<HockeyPlayer> it = hockeyPlayersList.iterator();
while (it.hasNext()) {
HockeyPlayer singleHockeyPlayer = it.next(); //the first one encountered
// HockeyPlayer nextHockeyPlayer = it.next(); //the next one encountered

[Code]...

This of course produces some duplication in the print-out: These are the equal hockey players: Who Ever wears jersey. This type of employee is paid: true. This employee has post-secondary education: false. This employee's work is to play. This hockey player has scored 0 goals.

Jason Harrison wears jersey. This type of employee is paid: true. This employee has post-secondary education: false. This employee's work is to play. This hockey player has scored 0 goals.

These are the equal hockey players: Jason Harrison wears jersey. This type of employee is paid: true. This employee has post-secondary education: false. This employee's work is to play. This hockey player has scored 0 goals.

Who Ever wears jersey. This type of employee is paid: true. This employee has post-secondary education: false. This employee's work is to play. This hockey player has scored 0 goals.

How do I remove the duplication in the print-out?

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JSP :: ForEach ArrayList Of Objects

Feb 11, 2014

I am trying to access an array of "Movie" objects in my jsp. The array is loaded via

org.springframework.web.servlet.ModelAndView.addObject().

Here is my jsp code:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="security" uri="http://www.springframework.org/security/tags"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

[Code] .....

The System.out.println("jsp page: .... &> results in the output: "jsp page: movielist - [Title: Die Hard; Budget: 20000000, Title: two days in paris; Budget: 1000000]" so I am confident the objects are being loaded into the ModelAndView correctly. However the output of the block is "${movie.name}" instead of the list of movies. My movie object has a getName() method to return a string (and a setName() method). I am not sure why the System.out.println statement can find the movielist attribute, but ${movie.name} is being treated a plain text. There are no execptions thrown or other indications of errors.

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How To Clone ArrayList Objects

Jun 20, 2014

I want to clone some Arraylist, but the compiler apparently are just referencing the values to it's original ArrayList. I don't know what should it be:

package projetoteste;
import java.util.ArrayList;
import java.util.List;
public class TestFood {
public static void main(String[] args) {
List food=new ArrayList();

[code]....

Notice that ArrayList dailyMeal should be untouchable, but it return the changes that I made in local for-loop iteration although I didn't added nothing to it, just to it's clone.

Output:

[[[Suco, 1 , 2], [Suco, 1 , 2]], [[Suco, 1 , 2], [Suco, 1 , 2]]]
[[[►, ►, Suco, 1 , 2], [►, ►, Suco, 1 , 2]], [[►, ►, Suco, 1 , 2], [►, ►, Suco, 1 , 2]]]

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Searching ArrayList Of Objects

Mar 23, 2014

Okay, I will be as succinct as possible. I am writing a rudimentary book store program for homework. The program consists of two class files and a main. The main issue I am having is on getting the search portion of my program to work. I will post as little as I can and still make sense. This is the block of code belongs to my public Book getBook() method, which is of the BookStore class.

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All Of ArrayList Objects Have Been Given Index Of -1

Nov 15, 2014

So I am working on an assignment and ran into an annoying bug. Basically i have a menu that accesses an ArrayList of Videos which may or may not be read from a file, one of the options of the menu is to edit an existing Video. For this I ask the user for the number of the video and it is checked against the list of video numbers if it returns a match, the method gets the index of the Video object and stores it in a temporary variable the user is allowed to edit the details and the object is put back into the ArrayList using the variable and the ArrayList's set() method

My problem is that once i finish editing the details of a video it gives me a indexOutOfBounds exception

On further investigation using a method that goes through the index of every object in the ArrayList using indexOf() i found out that every single object has been given the index of -1 and not 0,1,2,3 etc.. This is my first error and have not expierenced any other before.

The objects do exist because I have read them from a file. I can also add new Objects and view them successfully but they still have the same index . I have checked my syntax and everything and no errors, this happens at run time only.

I have even created some other ArrayLists seperately and debugged them and their index order is fine. I am too far into this project to start over. I've also tried cleaning the project(my IDE is Eclipse).

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Adding Objects To ArrayList

Oct 17, 2014

I've two classes: Student and ArrayListExamples (which has my main method in it).

The student class acts pretty simply at the moment with a constructor that takes a name, surname and ID number. I've tested it and it seems to be working. My issue is with adding an object to an array list, here is my effort:

public class ArrayListExamples {
private static int MAX_SIZE = 50;
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
ArrayList<Student> students = new ArrayList();
 
[code]....

I know the last loop to add the student objects is wrong.I'm calling the student ArrayList add method with a student object whose constructor requires two strings and an integer. Why isn't this allowed?

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Objects Of ArrayList Overwriting

Jan 23, 2014

I'm having trouble getting new objects to add to an ArrayList. Instead, every time a new object is created and added, it overwrites the first object. So if I read in four lines from a text file and make them into four objects, each overwrites the previous and only the last object is printed. I can print out the contents correctly if I move the println statement within the if-loop; however, I need all the objects to saved to the list for searching (later implementation). i believe it has something to do with the instances of the object, but I'm a little confused about how to fix it. Here's the portion of the code I'm looking at:

Java Code:

if (fileChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
Scanner scanner = new Scanner(new FileReader(file));
String currentLine;
System.out.printf("%-20s %-20s %-20s

[Code] .....

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JSP :: Printing ArrayList Of Objects

Feb 25, 2014

How would you display an ArrayList of Objects in a JSP page from a Servlet. Any general example would be fine as long as the example is thorough.

Each created object has more than maybe 6 or 7 properties that all need to print to the JSP.

Would you also include ways of printing it like should it be printed by using a table structure in the JSP and if so how? Things of that nature so that way it is each object has its own line and looks good. I can format it myself, I just need to know how to get it in a table for each object to print on its own row and so on...

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How To Move Multiple Objects At Once

Oct 8, 2014

I am new to Java programming and i am using BLUEJ to create some basic objects etc.

I have 3 circle objects (individual) and i am wanting to use "slowMoveHorizontal" method to move these 3 objects about 50px to the right.

So far, everything works BUT the issue is that they do NOT move together simultaneously. They move on a ONE BY ONE basis.

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How To Add Multiple Parameters To ArrayList

Feb 10, 2014

For example, if I have a class called Teacher with the constructor:

public Teacher(double yearsTeaching, boolean isMale, double age)
{
this.yearsTeaching = yearsTeaching;
this.isMale = isMale;
this.age = age;
}

How would I add it to these parameters to my ArrayList in my Tester class?

List<Teacher> teachers = new ArrayList<Teacher>();

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ArrayList Through Multiple Classes?

Oct 25, 2014

I have to make a retail item class that has description, price and quantity. I then have to make a CashRegister class that calculates subtotal, tax, total and displays it (toString). I also have to make a driver class to call the methods from main. I have no clue what I am doing and what I have done does not work. I am trying to make it sort of like a cart, in the CashRegister it should ask the user to enter the description, quantity purchased and the price. Then it would send that to the arraylist of retailitem. I am having trouble using those items in my other methods and then do not know how to call those in the driver class.. So here are my classes:

public class RetailItem {
private String description;
private int quantity;
private double price; 
public RetailItem(){
description = "";
quantity = 0;

[Code] ....

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ArrayList Through Multiple Classes

Oct 25, 2014

Alright.. So I have to make a retail item class that has description, price and quantity. I then have to make a CashRegister class that calculates subtotal, tax, total and displays it (toString). I also have to make a driver class to call the methods from main. I have no clue what I am doing and what I have done does not work. I am trying to make it sort of like a cart, in the CashRegister it should ask the user to enter the description, quantity purchased and the price. Then it would send that to the arraylist of retailitem. I am having trouble using those items in my other methods and then do not know how to call those in the driver class...

So here are my classes: [URL] ....

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Static Keyword For Arraylist Containing Objects

Jun 14, 2014

I've come across something that i'm not overall sure about regarding the static keyword in Java.I'm making a vertical scrolling game where the player simply shoots enemies and they shoot back as they fall, dropping items if they die such as power ups and coins. I have an enemy called Bat and this is the bullet creation code in the update method:

if(oldPlayerY + 220 > posY && getBulletDelay > 0.90f){
batBullets.add(new Bullet(posX + 10, posY - 10));
getBulletDelay = 0;
}

The method is creating a new bullet object and it then adds that to the arraylist called batBullets, which is simple enough. I then need to access this arraylist in the main game update class so I can render those bullets on the screen, even if the bat dies. I was always taught that you use the static keyword when you need to access something from the class that doesn't require an object. Because of this, I have the following code.

for(Bullet bullet : Bat.batBullets){
bullet.setY(bullet.getY - 5); // Set the bullet to fall
renderMap.getSpriteBatch().draw(bullet.batBullet(), bullet.getX(), bullet.getY()); // render the bullets
}

This seems perfectly fine to me because I need to access the batBullet arraylist and it doesn't make sense to create a new bat object as I already have random spawning in place for them.

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Drawing Multiple Objects Swing

Jun 30, 2014

I have to do an assigment using Swing, where I have to make a Board(extends JPanel) and add multiple instances of moving elements to it, with following requirements:

By adding a new object to the Board, the others must not slow down. Also the user interface must not be blocked by the moving objects. So, the movement of the objects must be handled in a separate thread.

and

The application must support adding lots of objects, so it is not okay if every object has its own thread, as this would take too many resources. Design the application in such a way that it uses a constant number of threads, meaning that the number of threads does not grow when adding more objects.

The question is:

How to do this thing with constant number of threads?

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Linked List Of Multiple Objects

Oct 19, 2014

How can i make a linked-list of objects ?

For example i have a class called Car() with variables like color and model and I want to do a linked-list of multiple cars, how ?

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Remove Multiple Elements From ArrayList?

Dec 27, 2014

I have an ArrayList of tens of thousands of elements, and want to remove the items at a given set of sorted indices like {1,5,29,318,499,583}. It seems like this operation could be performed in linear time and space by first finding a cumulative sum of the shifts needed to move everything to their right positions and then shifting every item. On the other hand, removing and shifting one by one would seem to require many more shifts. Is there a way to do this in Java's ArrayList?

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Arraylist Storing Multiple Types Of Data

Nov 16, 2014

I have declared an array list that will store data type of 1 Character and 2 integer. The data that will be store in this list is

1. A = {0 3}
2. B = {0 5}
3. C = {0 3}
4. D = {0 3}
5. E = {0 5}
6. F = {0 6}

Now here the alphabets are routers and integers are there con1 and con2 respectively. I have a set of router={ A,B,C,D,E,F}.

Step 1:I have to subtract con1 from con2 i.e. (3-0) of all the routers and
Step 2: then put the router having largest value in new set 1 and
Step 3: then this router will be subtract from the router set.
Step 4:then again I have to repeat the step 1 until the value of routers become <= 1.

Now what I did is I defined 3 arrays first is String array that stores names of routers, 2nd array that stores the first value and 3rd array that stores the second value. I can find the largest value but how to store the name of router against the largest value in the set.

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Java - Going Through Value In Multiple ArrayList (Nested For Loop)

Jan 24, 2014

I just started playing around with Java for awhile, but got caught up in a problem when using ArrayList.

CinemaAppMain
public class CinemaAppMain {
public static void main(String[] args) {
new CinemaApp().start();

[Code]....

I am trying to get the movie name and theatre title from their ArrayList, and I know I need to go through the movie list & theatre list to find their name & title, and compare it with the user input and print out the result.

I use for(int i=0;i<movies.size();i++) to go through the the movie list, and I tried using for(int i=0;i<theatres.size();i++) to go through the theatre list. But when I printing multiple time with different user input value, it will show me strange result (screening have same movie name & theatre name, the else if statement is printed below the user input, user input is printed more than once after the first time).

Edit: I know its wrong for me to use nested for loop,if not, another solution is needed to get the item inside both of the list. (getting the "title" from movie list & "name" from theatre list)

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ArrayList Only Adding 1 Item When There Are Multiple Items

Oct 25, 2014

I managed to retrieve data, and set data in my own ways in which I like. But my problem is, if the file does not contain anything (fully empty), when I try to use my

set("", "");
method, it only sets the last one that is called.

Example:

set("section1", "section1Item");
set("section2", "section2Item");
set("section3", "section3Item");

Only section3 would get set, and not the others.

Otherwise, if the file contained a section already, then each section (section1, section2, section3) would get set.

Here's how I set the data to the file:

public static void set(String section, String data) {
files.openFileWriter();
files.file.delete();
reCreateFile();
String beforeItem = section + ":" + files.dataList.get(section);
if(files.hasReadData) {

[Code] ....

And here is how a retrieve the data and set them to my arraylist/hashmap:

public void getData() {
String line = null;
openFileReader();
StringBuffer sb = new StringBuffer();

[Code] ....

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Sorting Arraylist Of Calendar Objects To Find Maximum

Oct 14, 2014

I have a requirement to find the greatest/maximum of the given list of Calendar objects in Java.

i.e., 2013/01/26
2014/03/03
2012/02/27
2014/01/15

So the above list of calendar objects are in Arraylist. I need to get the max/greatest among these. Eventually, the answer should be 2014/03/03

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Rendering Multiple Image Objects From Array In Location

Jan 11, 2015

Untitled.jpg I have been working over this game lately, and i have managed to render multiple images from an array. in this fashion. I created a Main() class with the following in it:

public Main() {
for (int i = 0; i < fuel.length; i++) {
Random r = new Random(); 
changef = r.nextBoolean();
y = (-600 * i) + r.nextInt(300);
if (changef)
fx = 325;
else

[Code]...

Also, this is the Fuel image class and Obstacle image class:

public void tick(Player2 p2) {
y += dy;
Random r = new Random();
if(x >= p2.getH()) {
y = -40 - r.nextInt(700);

[Code]...

(Fuel and obstacle class are identical but separate for better accessibility) I even have player class with an image listening to key events and also a scrolling background. The problem is when i run the game, the images of obstacles render themselves as i want, except for that they overlap each other, i need to prevent over lapping of this images. The fuel is read and obs is black. Heres a glance of how it looks.

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Sorting ArrayList Of Geometric Objects By Area From Smallest To Largest

Mar 18, 2014

I have to create a method with the following header :

public static <E extends Comparable<E> > void sort ( ArrayList<E> list , int left, int right)

i also had to create a swap cells method and position of max integer method. and also had to read the preserved data file in with a scanner. I implemented the comparable interface I am having difficulty sorting my list by the area. It has to be in descending order.

Geometric Object class: since it has comparator also am interested if i need to change this?

CODE:

Driver:
public static void main(String[] args) throws IOException, ClassNotFoundException {
Circle c1 = new Circle (4, "red", false);
Circle c2 = new Circle (2, "blue", true);
Circle c3 = new Circle (10, "blue", true);
Rectangle r1 = new Rectangle (10, 6, "yellow", true);
Rectangle r2 = new Rectangle ( 5, 11, "green", true);
ArrayList <GeometricObject> list = new ArrayList();

[Code] ....

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