package 事件;import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;public class TEST extends Applet implements ActionListener {
Panel p;
Button btn;
TextField t;
Color c;
Random r1,r2,r3;
public void init()
{
r1=new Random();
int t1=r1.nextInt(255);
r2=new Random();
int t2=r2.nextInt(255);
r3=new Random();
int t3=r3.nextInt(255);
btn=new Button("改变颜色");
t=new TextField("helloworld");
c=new Color(t1,t2,t3);
btn.addActionListener(this);
add(t);
add(btn);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource()==btn){
t.setBackground(c);
}
repaint();
}
}
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;public class TEST extends Applet implements ActionListener {
Panel p;
Button btn;
TextField t;
Color c;
Random r1,r2,r3;
public void init()
{
r1=new Random();
int t1=r1.nextInt(255);
r2=new Random();
int t2=r2.nextInt(255);
r3=new Random();
int t3=r3.nextInt(255);
btn=new Button("改变颜色");
t=new TextField("helloworld");
c=new Color(t1,t2,t3);
btn.addActionListener(this);
add(t);
add(btn);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource()==btn){
t.setBackground(c);
}
repaint();
}
}
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;public class TEST extends Applet implements ActionListener {
Panel p;
Button btn;
TextField t; public void init() {
btn = new Button("改变颜色");
t = new TextField("helloworld");
btn.addActionListener(this);
add(t);
add(btn);
} /**
* 改变颜色方法
* @return
*/
public Color change(){
Random r1, r2, r3;
Color c;
r1 = new Random();
int t1 = r1.nextInt(255);
r2 = new Random();
int t2 = r2.nextInt(255);
r3 = new Random();
int t3 = r3.nextInt(255);
c = new Color(t1, t2, t3);
return c;
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if (e.getSource() == btn) {
t.setBackground(change());
}
repaint();
}
}
init()方法只能初始化一次,所以自然就不会变咯