Question

为什么java的setBackground（）不管用，代码如下，背景色一直是白的，麻烦帮忙修改下，谢了~

import java.applet.*;
import java.awt.*;
import javax.swing.JApplet;
public class cc extends JApplet
{
public void paint(Graphics g)
{
Graphics2D g2=(Graphics2D)g;
int red,green,blue;
red=255;
blue=255;
green=0;
g2.setPaint(new Color(red,green,blue));
setBackground(Color.cyan);
g2.drawString("Welcome to Xi\047an",25,75);
showStatus("Current RGB:"+g2.getPaint().toString())
}
}

Answer 1

你的代码里没绘制背景的代码 ，而且，你也没有调用父类的方法，去绘制 

我帮你改改 

public void paint(Graphics g) {
setBackground(Color.cyan);
super.paint(g);
Graphics2D g2 = (Graphics2D) g;
int red, green, blue;
red = 255;
blue = 255;
green = 0;
g2.setPaint(new Color(red, green, blue));
g2.drawString("Welcome to Xi\047an", 25, 75);
showStatus("Current RGB:" + g2.getPaint().toString());
}

Answer 2

this.getContentPane().setBackground(Color.cyan);
就可以了
可以参考这个
http://zhidao.baidu.com/question/263731760.html