package bbb;
import java.awt.*
;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*
;
public class myframe
implements ActionListener{
JFrame f;
JPanel p1,p2;
JButton b1,b2,b3;
public myframe(){
JFrame f=
new JFrame("颜色改变"
);
JPanel p1=
new JPanel();
JPanel p2=
new JPanel();
p2.setBackground(Color.yellow);
JButton b1=
new JButton("红色"
);
b1.addActionListener(this);
JButton b2=
new JButton("绿色"
);
b2.addActionListener(this);
JButton b3=
new JButton("蓝色"
);
b3.addActionListener(this);
f.setLayout(new BorderLayout());
p1.add(b1);
p1.add(b2);
p1.add(b3);
f.add(p1,BorderLayout.NORTH);
f.add(p2,BorderLayout.CENTER);
f.setSize(500,500
);
f.setVisible(true);
}
public static void main(String []args){
new myframe();
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO 自动生成的方法存根
if(arg0.getSource() ==
b1)
p2.setBackground(Color.red);
else if(arg0.getSource() ==
b2)
p2.setBackground(Color.green);
else if(arg0.getSource() ==
b3)
p2.setBackground(Color.blue);
}
}
转载于:https://www.cnblogs.com/YShen0/p/10954545.html
