为啥设置的background不起作用

Question

import java.awt.*;

public class TestBorderLayout {

public static void main(String[] args) {

Frame f = new Frame("Border Layout");

f.setLocation(300,300);

f.setSize(500,300);

f.setBackground(new Color(104,104,200));

Button bn = new Button("bn");

Button bs = new Button("bs");

Button bw = new Button("bw");

Button be = new Button("be");

Button bb = new Button("bb");

f.setLayout(new BorderLayout());

f.add(bn,BorderLayout.NORTH);

f.add(bs,BorderLayout.SOUTH);

f.add(bw,BorderLayout.WEST);

f.add(be,BorderLayout.EAST);

f.add(bb,BorderLayout.CENTER);

f.setVisible(true);

}

}

Answer 1

f.setBackground(new Color(104,104,200));是改变框架的颜色，而框架的上面还有窗格，所以你要改变窗格的颜色才可以彻底改变框架的颜色。改为下面方式即可f.getContentPane().setBackground(new Color(104,104,200));