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import javax.swing.*;
 
 
/**
 *
 * 
 */
public class MischievousMain {
    public static void main(String[] args) {
       JFrame frame = new JFrame("Bouncing Cube");
       frame.setSize(500, 500);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       // mischievous square input
       frame.add(new BouncingMischievousSquare());
       frame.setVisible(true);
    }  
 
 
 
/**
 *
 * 
 */
import java.util.Random;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class BouncingMischievousSquare extends JPanel implements ActionListener { 
 
    private static final int SQUARE_SIZE = 40;
    private static final int SPEED_OF_SQUARE = 6;
    private int xPosit, yPosit;
    private int xSpeed, ySpeed;
 
    BouncingMischievousSquare(){
        //speed  direction
        xSpeed = SPEED_OF_SQUARE;
        ySpeed = -SPEED_OF_SQUARE;
        //a timer for repaint 
        //http://d...content-available-to-author-only...e.com/javase/tutorial/uiswing/misc/timer.html
        Timer timer = new Timer(100, this);
        timer.start();
    }
    public void actionPerformed(ActionEvent e){
        //Screensize
        int width = getWidth();
        int height = getHeight();
        xPosit += xSpeed;
        yPosit += ySpeed;
        //test xAxis
        if(xPosit < 0){
            xPosit = 0;
            xSpeed = SPEED_OF_SQUARE;
        }
        else if(xPosit > width - SQUARE_SIZE){ 
            xPosit = width - SQUARE_SIZE;
            xSpeed = -SPEED_OF_SQUARE;
        }
        if(yPosit < 0){
            yPosit = 0;
            ySpeed = SPEED_OF_SQUARE;
        }
           else if(yPosit > height - SQUARE_SIZE){ 
            xPosit = height - SQUARE_SIZE;
            xSpeed = -SPEED_OF_SQUARE;
           }
        //ask the computer gods to redraw the square
        repaint();
    }
     public void paintComponent(Graphics g){       
         super.paintComponent(g);
         g.fillRect(xPosit, yPosit, SQUARE_SIZE, SQUARE_SIZE );
     }
}
 
 
 
 

Main.java:25: error: illegal start of type
import java.util.Random;
^
Main.java:25: error: ';' expected
import java.util.Random;
      ^
Main.java:25: error: illegal start of type
import java.util.Random;
           ^
Main.java:25: error: ';' expected
import java.util.Random;
                ^
Main.java:25: error: <identifier> expected
import java.util.Random;
                       ^
Main.java:26: error: illegal start of type
import javax.swing.*;
^
Main.java:26: error: ';' expected
import javax.swing.*;
      ^
Main.java:26: error: illegal start of type
import javax.swing.*;
            ^
Main.java:26: error: ';' expected
import javax.swing.*;
                  ^
Main.java:27: error: illegal start of type
import java.awt.*;
^
Main.java:27: error: ';' expected
import java.awt.*;
      ^
Main.java:27: error: illegal start of type
import java.awt.*;
           ^
Main.java:27: error: ';' expected
import java.awt.*;
               ^
Main.java:28: error: illegal start of type
import java.awt.event.*;
^
Main.java:28: error: ';' expected
import java.awt.event.*;
      ^
Main.java:28: error: illegal start of type
import java.awt.event.*;
           ^
Main.java:28: error: ';' expected
import java.awt.event.*;
               ^
Main.java:28: error: <identifier> expected
import java.awt.event.*;
                      ^
Main.java:76: error: reached end of file while parsing
}
 ^
19 errors

Standard output is empty