可以用swing里的Timer;或者给eleven1实现一个Runnable接口。下面是用Timer的实现import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
//add by iame
import java.awt.event.*;
//MyWindowListener;//
public class eleven1 extends JFrame
{
//add by iame
Timer timer=new Timer(500,this);
Color[] colors={Color.red,Color.green,Color.blue};
int index=0;
public eleven1()
{
super("ready");
setSize(500,80);
show();
timer.start();
}
public void paint(Graphics g)
{
Font font=new Font("Serif",Font.BOLD,20);
//add by iame
g.setColor(colos[index%3]);
g.setFont(font);
g.drawString("按顺序变换水平线为红绿蓝色",60,60);
g.drawLine(60,70,400,70);
}
public static void main(String args[])
{
eleven1 app=new eleven1();
app.addWindowListener(new MyWindowListener());
}
}
import javax.swing.*;
import java.awt.event.*;
//add by iame
import java.awt.event.*;
//MyWindowListener;//
public class eleven1 extends JFrame
{
//add by iame
Timer timer=new Timer(500,this);
Color[] colors={Color.red,Color.green,Color.blue};
int index=0;
public eleven1()
{
super("ready");
setSize(500,80);
show();
timer.start();
}
public void paint(Graphics g)
{
Font font=new Font("Serif",Font.BOLD,20);
//add by iame
g.setColor(colos[index%3]);
g.setFont(font);
g.drawString("按顺序变换水平线为红绿蓝色",60,60);
g.drawLine(60,70,400,70);
}
public static void main(String args[])
{
eleven1 app=new eleven1();
app.addWindowListener(new MyWindowListener());
}
}
public class eleven1 extends JFrame implement ActionListener
public void actionPerformed(ActionEvent e)
{
index++;
repaint();
}
import java.awt.*;
import java.awt.event.*;
class MyWindowListener extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
System.exit(1);
}
}
请完整写出
import javax.swing.*;
import java.awt.event.*;
//add by iame
import java.awt.event.*;
class MyWindowListener extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
System.exit(1);
}
}public class eleven1 extends JFrame implements ActionListener
{
//add by iame
Timer timer=new Timer(500,this);
Color[] colors={Color.red,Color.green,Color.blue};
int index=0;
public eleven1()
{
super("ready");
setSize(500,80);
show();
timer.start();
}
public void actionPerformed(ActionEvent e)
{
index++;
repaint();
}
public void paint(Graphics g)
{
Font font=new Font("Serif",Font.BOLD,20);
//add by iame
g.setColor(colors[index%3]);
g.setFont(font);
g.drawString("按顺序变换水平线为红绿蓝色",60,60);
g.drawLine(60,70,400,70);
}
public static void main(String args[])
{
eleven1 app=new eleven1();
app.addWindowListener(new MyWindowListener());
}
}