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Create a class called, ThreeObjectAnimation, that creates a graphic animation with three animation object. The ThreeObjectAnimation class should move three objects around the frame, either randomly, or following a fixed pattern. The movements should occur every 250 milliseconds. The ThreeObjectAnimation class should use three classes, ObjectA, ObjectB, and ObjectC for these three movable objects. The object are allowed to intersect. Each of these classes is responsible for drawing a distinct graphics object with at least four shapes and two colours.

The size and colour of the shapes drawn by ObjectA, ObjectB, and ObjectC should be modified every 500 milliseconds. For example, if ObjectA draw a rectangle, then the size of the rectangle could change, a circle in ObjectB could changle colour..

please i am trying to make GPA calculator in java GUI but i the code isnt working so please anyone tell em what is the wrong with it and thanks in advance

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.InputMismatchException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
public class GPA extends JFrame {
private JPanel contentPane;
private JTextField grades1;
private JTextField credits1;
private JTextField grades2;
private JTextField credits2;
private JTextField grades3;
private JTextField credits3;
private JTextField grades4;
private JTextField credits4;
private JTextField grades5;
private JTextField credits5;
private JLabel class6;
private JTextField grades6;
private JTextFiel

hello sir i am using hashset of type integer in my code
HashSet<Integer> set = new HashSet<Integer>();
for(int j=0;j<2;j++){
if(set.contains(l[i][j])==false){
set.add(l[i][j]);
//System.out.print(set);
//System.out.print(" "+l[i][j]);
}
}
Iterator iterator =set.iterator();
while(iterator.hasNext())
{
System.out.println(iterator.next());

}
and want to eliminate duplicate from that but its not working output is
[0][0, 4]
[1][1, 7]
[2][2, 8]
[3][3, 9]
[4][0, 4]
[5][5, 9]
[0]
[7][1, 7]
[8][2, 8]
[9][5, 9]
i don't want similar items like [0, 4] repeating
so please help me

Every time I try to open my javascript file i get this error on Line: 1 Char: 1 Error: 'window' is undefined Code: 800A1391 Source: Microsoft JScript runtime error

My code is a simple html file, a javascript js file, and a json file. The html and json file opens up but the javascript does not. also the javascript is supposed to make the info in the json file appear on the html page but it does not

this is the javascript

window.onload = function() {
var url = "file:///C:/wamp/www/gumball/sales.json";
var request = new XMLHttpRequest();
request.open("GET", url);
request.onload = function() {
if (request.status == 200) {
updateSales(request.responseText);
}
};
request.send(null);
}
function updateSales(responseText) {
var salesDiv = document.getElementById("sales");
salesDiv.innerHTML = responseText;
}