Java Strength Pinball Ball implementation code _java

First look at the effect chart:

directly on the code.
Adjust the button and draw a few circles on the canvas, then realize the monitor ...

Package cn.hncu.threadDemo.thread2;
Import Java.awt.Canvas;
Import Java.awt.Color;
Import Java.awt.Graphics;
Import java.awt.event.ActionEvent;
Import Java.awt.event.ActionListener;
Import java.awt.event.FocusEvent;

Import Java.awt.event.FocusListener;
Import Javax.swing.JFrame;
Import Javax.swing.JLabel;
Import Javax.swing.JPanel;
Import Javax.swing.JSpinner;
Import Javax.swing.Timer;
Import javax.swing.event.ChangeEvent;

Import Javax.swing.event.ChangeListener;
  public class Ballsjframe extends JFrame implements changelistener{private Ballscanvas ball;

  Private JSpinner spinner;
    Public Ballsjframe () {super ("Bouncing Ball");
    This.setbounds (300, 200, 400, 300);
    This.setdefaultcloseoperation (Exit_on_close);

    Color colors[] = {Color.red,color.green,color.blue,color.magenta,color.cyan};
    Ball = new Ballscanvas (colors,100);
    This.getcontentpane (). Add (ball);/default is center location JPanel Panel = new JPanel ();
    This.getcontentpane (). Add (Panel, "South"); Panel.add (New JLabel ("Delay"));
    Spinner = new JSpinner ();

    Spinner.setvalue (100);

    Panel.add (spinner);

    Spinner.addchangelistener (this);
  This.setvisible (TRUE);
    @Override public void statechanged (ChangeEvent e) {int value = Integer.parseint ("" +spinner.getvalue ());
  Ball.setdelay (value);
  public static void Main (string[] args) {new ballsjframe ();  } class Ballscanvas extends Canvas implements ActionListener, focuslistener{private Ball balls[];//store all the balls private Timer Timer;//javax.swing.timer public Ballscanvas (Color colors[], int delay) {this.balls = new ball[colors.length
    ];

    for (int i=0,x=40;i<colors.length;i++,x+=20) {This.balls[i] = new Ball (x,x,colors[i));


    //Let the current canvas monitor the Focus event This.addfocuslistener (this);
    Timer = new timer (delay,this);

  Timer.start ();
  public void Setdelay (int delay) {timer.setdelay (delay); @Override public void Paint (Graphics g) {for (int I=0;i<this.balls.length;i++) {g.setcolor (balls[i].color); Let's change the coordinates of each ball---(x coordinates) balls[i].x = Balls[i].left?
      balls[i].x-10:balls[i].x+10; When the ball hits the wall, change the direction of the ball if (balls[i].x<=0| |
      Balls[i].x>=this.getwidth () -24) {balls[i].left =!balls[i].left;//Toggle Direction}//Let the coordinates of each ball change---(Y-coordinate) Balls[i].y = balls[i].up?
      balls[i].y-10:balls[i].y+10; When the ball hits the wall, change the direction of the ball if (balls[i].y<=0| | Balls[i].y>=this.getheight () -22) {balls[i].up =!balls[i].up;//Toggle Direction} g.filloval (balls[i].x, Bal
    LS[I].Y, 20, 20);
    @Override public void actionperformed (ActionEvent e) {//system.out.println ("AAA");
  Repaint (),//Refresh canvas. Call Paint (Graphics g)} @Override public void focusgained (FocusEvent e) {timer.stop ();

  @Override public void Focuslost (FocusEvent e) {Timer.restart ();
    private static class ball{int x,y;
    Boolean up,left;
    Color color; public Ball (int x, int y, color color) {This. x = x;
      This.y = y;
      This.color = color;
    Up = left = false;
 }

  }




}

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