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));