packagelh;importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;publicclasslh1implementsActionListener{JFramef;JButtonT;booleanxs=true;publiclh1(){f=newJFrame("世纪...

package lh;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class lh1 implements ActionListener {

JFrame f;

JButton T;

boolean xs=true;

public lh1() {

f = new JFrame("世纪大作《New World》欢迎您！");

f.setSize(400, 500);

f.setVisible(xs);

f.setBackground(Color.BLUE);

T = new JButton("进入游戏");

T.setBounds(100, 50, 200, 50);

T.addActionListener(this);

T.setForeground(Color.GREEN);

f.add(T);

T = new JButton("注册账号");

T.setBounds(100, 150, 200, 50);

T.addActionListener(this);

T.setForeground(Color.GREEN);

f.add(T);

T = new JButton("找回密码");

T.setBounds(100, 250, 200, 50);

T.addActionListener(this);

T.setForeground(Color.GREEN);

f.add(T);

T = new JButton("退出游戏");

T.setBounds(100, 350, 200, 50);

T.addActionListener(this);

T.setForeground(Color.GREEN);

f.add(T);

}

public void actionPerformed(ActionEvent e) {

String s = e.getActionCommand();

if (s.equals("注册账号"))

lh2.zc();

else if(s.equals("退出游戏"))

System.exit(0);

}

public static void main(String[] args) {

new lh1();

}

}

为什么背景不变色？ 还是灰白的

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