作者pepsitetsu (pepsi !)
看板java
标题[问题] 新手问题
时间Mon Dec 27 13:48:06 2010
小弟是新手 若是程式码的观念错误还请前辈们多多指教
问题是这样的 小弟想做一个简单的GUI 就是单纯一颗球在那边跑
底下是code
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GuiAniTest
{
DrawPanel1 panel;
JButton btn;
int x = 150, y = 150, width = 20, height = 20, vx = 1, vy = 1;
boolean s = true;
public static void main(String[] args)
{
new GuiAniTest().go();
}
public void go()
{
JFrame frame = new JFrame();
panel = new DrawPanel1();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
btn = new JButton("STOP");
btn.addActionListener(new BtnClickListener());
frame.getContentPane().add(BorderLayout.SOUTH, btn);
frame.setSize(300, 300);
frame.setVisible(true);
moveBall();
}
private void moveBall()
{
while (s)
{
x += vx;
y += vy;
if (x < 0 || x + width > panel.getWidth()) vx *= -1;
if (y < 0 || y + height > panel.getHeight()) vy *= -1;
panel.repaint();
System.out.println(x + ","+ y );
try {Thread.sleep(20);}
catch (Exception e) {System.out.println(e.toString());}
}
}
class DrawPanel1 extends JPanel
{
public void paintComponent(Graphics g)
{
g.clearRect(0, 0, getWidth(), getHeight());
g.setColor(Color.RED);
g.fillOval(x, y, width, height);
}
}
class BtnClickListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
s = !s;
String msg=s?"Stop":"Start";
btn.setText(msg);
moveBall();
}
}
}
现在出现了一个问题 就是底下的btn在按第二次的时候
就没有作用了 按右上的x不会关视窗球也不会跑
但x和y还是会继续更新
如果我想要让它按一下停止 再按一下继续跑 那程式码应该怎麽修正呢?
谢谢前辈们指教
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