我试过用：

frame1.getContentPane().setBackground(Color.yellow);

但它没有用.谁能帮我？

import java.awt.*;

import java.awt.Color;

public class PlayGame {

public static void main(String[] args) {

GameFrame frame1 = new GameFrame();

frame1.getContentPane().setBackground(Color.yellow);

// Set Icon

Image icon = Toolkit.getDefaultToolkit().getImage("image/poker_icon.gif");

frame1.setIconImage(icon);

frame1.setVisible(true);

frame1.setSize(600, 700);

frame1.setTitle("Card Game");

// Set to exit on close

frame1.setDefaultCloseOperation(GameFrame.EXIT_ON_CLOSE);

}

}

GameFrame

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class GameFrame extends JFrame implements ActionListener {

private JPanel topPnl, btmPnl, pcPnl, mainPnl;

private JPanel titlePnl, playerPnl, computerPnl;

private JLabel titleLbl, playerLbl, computerLbl;

private JLabel testTextBox1, testTextBox2;

private ImageIcon playerIcon, computerIcon;

//

private JPanel pickCardPnl, pickCardTitlePnl, cardPnl, resultPnl, optionPnl;

private JLabel pickCardTitleLbl;

private JLabel card1Lbl, card2Lbl, card3Lbl, card4Lbl, card5Lbl;

private JLabel resultLbl;

private JButton restartBtn, showCardBtn, exitBtn;

private JButton card1Btn, card2Btn, card3Btn, card4Btn, card5Btn;

private ImageIcon card1Pic, card2Pic, card3Pic, card4Pic, card5Pic;

private JButton playerBtn, computerBtn;

private ImageIcon playerPic;

private String[] card = new String[53];

private String name;

// ArrayInt al;

public GameFrame() {

// a1 = new Array();

//a1.generateRandom();

setCard();

setName();

// Top Panel /

mainPnl = new JPanel(new BorderLayout());

topPnl = new JPanel(new BorderLayout(50, 0));

titlePnl = new JPanel();

pcPnl = new JPanel(new GridLayout(1, 2, 10, 10));

playerPnl = new JPanel(new BorderLayout(10, 10));

computerPnl = new JPanel(new BorderLayout(10, 10));

// Title Panel

titleLbl = new JLabel("Card Game");

titlePnl.add(titleLbl);

// Player Panel

playerIcon = new ImageIcon("image/player.png");

playerLbl = new JLabel(name, playerIcon, JLabel.CENTER);

playerPnl.add(playerLbl, BorderLayout.NORTH);

playerPic = new ImageIcon("image/unknwon.png");

playerBtn = new JButton(playerPic);

playerPnl.add(playerBtn, BorderLayout.CENTER);

playerBtn.setContentAreaFilled(false);

playerBtn.setBorder(BorderFactory.createEmptyBorder());

// Computer Panel

computerIcon = new ImageIcon("image/computer.png");

computerLbl = new JLabel("Computer:", computerIcon, JLabel.CENTER);

computerPnl.add(computerLbl, BorderLayout.NORTH);

playerPic = new ImageIcon("image/back.png");

computerBtn = new JButton(playerPic);

computerPnl.add(computerBtn, BorderLayout.CENTER);

computerBtn.setContentAreaFilled(false);

computerBtn.setBorder(BorderFactory.createEmptyBorder());

pcPnl.add(playerPnl);

pcPnl.add(computerPnl);

// Add panel into Top Panel

topPnl.add(titlePnl, BorderLayout.NORTH);

topPnl.add(pcPnl, BorderLayout.CENTER);

// Bottom Panel /

btmPnl = new JPanel(new BorderLayout());

pickCardPnl = new JPanel(new BorderLayout());

pickCardTitlePnl = new JPanel();

cardPnl = new JPanel(new GridLayout(1, 5, 5, 5));

resultPnl = new JPanel();

optionPnl = new JPanel(new GridLayout(1, 3, 5, 5));

// Pick Card Panel

pickCardTitleLbl = new JLabel("Pick Your Card:");

pickCardPnl.add(pickCardTitleLbl, BorderLayout.NORTH);

card1Pic = new ImageIcon(card[1]);

card1Btn = new JButton(card1Pic);

cardPnl.add(card1Btn);

card1Btn.addActionListener(this);

card2Pic = new ImageIcon(card[2]);

card2Btn = new JButton(card2Pic);

cardPnl.add(card2Btn);

card2Btn.addActionListener(this);

card3Pic = new ImageIcon(card[3]);

card3Btn = new JButton(card3Pic);

cardPnl.add(card3Btn);

card3Btn.addActionListener(this);

card4Pic = new ImageIcon(card[4]);

card4Btn = new JButton(card4Pic);

cardPnl.add(card4Btn);

card4Btn.addActionListener(this);

card5Pic = new ImageIcon(card[5]);

card5Btn = new JButton(card5Pic);

cardPnl.add(card5Btn);

card5Btn.addActionListener(this);

// new ImageIcon(a1.getRandomNumber);

pickCardPnl.add(cardPnl, BorderLayout.CENTER);

card1Btn.setContentAreaFilled(false);

card1Btn.setBorder(BorderFactory.createEmptyBorder());

card2Btn.setContentAreaFilled(false);

card2Btn.setBorder(BorderFactory.createEmptyBorder());

card3Btn.setContentAreaFilled(false);

card3Btn.setBorder(BorderFactory.createEmptyBorder());

card4Btn.setContentAreaFilled(false);

card4Btn.setBorder(BorderFactory.createEmptyBorder());

card5Btn.setContentAreaFilled(false);

card5Btn.setBorder(BorderFactory.createEmptyBorder());

// Result Panel

setCard();

resultLbl = new JLabel("adasdadadasdasdasdasd");

resultPnl.add(resultLbl);

// Option Panel

restartBtn = new JButton("Restart");

optionPnl.add(restartBtn);

restartBtn.addActionListener(this);

showCardBtn = new JButton("Show Cards");

optionPnl.add(showCardBtn);

showCardBtn.addActionListener(this);

exitBtn = new JButton("Exit");

optionPnl.add(exitBtn);

exitBtn.addActionListener(this);

// Add panel into Bottom Panel

btmPnl.add(pickCardPnl, BorderLayout.NORTH);

btmPnl.add(resultPnl, BorderLayout.CENTER);

btmPnl.add(optionPnl, BorderLayout.SOUTH);

//

mainPnl.add(topPnl, BorderLayout.NORTH);

// add(midPNL, BorderLayout.CENTER);

mainPnl.add(btmPnl, BorderLayout.CENTER);

add(mainPnl);

// Menu bar

JMenuBar menuBar = new JMenuBar();

JMenu menu = new JMenu("Game");

menuBar.add(menu);

JMenuItem item3 = new JMenuItem("Change Name");

item3.addActionListener(this);

menu.add(item3);

JMenuItem item = new JMenuItem("Change Card Deck");

item.addActionListener(this);

menu.add(item);

JMenu subMenu = new JMenu("Change BackGround");

subMenu.addActionListener(this);

menu.add(subMenu);

JMenuItem subItem = new JMenuItem("Blue");

subItem.addActionListener(this);

subMenu.add(subItem);

JMenuItem subItem2 = new JMenuItem("Green");

subItem2.addActionListener(this);

subMenu.add(subItem2);

//

menu.addSeparator();

//

JMenuItem item4 = new JMenuItem("Quit");

item4.addActionListener(this);

menu.add(item4);

setJMenuBar(menuBar);

} //End of GameFrame

public void setCard() {

GenRandom g1 = new GenRandom();

g1.GenRandomCard();

int[] allCard = new int[11];

allCard = g1.getAllCard();

for (int i = 1; i <= 10; i++) {

card[i] = "image/card/" + allCard[i] + ".png";

}

}

public void setName() {

// name = JOptionPane.showInputDialog(null, "Please Enter Your Name", "Welcome", JOptionPane.QUESTION_MESSAGE) + ":";

}

public void actionPerformed(ActionEvent e) {

if (e.getSource() == card1Btn) {

playerBtn.setIcon(card1Pic);

card1Btn.setEnabled(false);

}

if (e.getSource() == card2Btn) {

playerBtn.setIcon(card2Pic);

card2Btn.setEnabled(false);

}

if (e.getSource() == card3Btn) {

playerBtn.setIcon(card3Pic);

card3Btn.setEnabled(false);

}

if (e.getSource() == card4Btn) {

playerBtn.setIcon(card4Pic);

card4Btn.setEnabled(false);

}

if (e.getSource() == card5Btn) {

playerBtn.setIcon(card5Pic);

card5Btn.setEnabled(false);

}

if (e.getSource() == restartBtn) {

new AePlayWave("sound/jet.wav").start();

JOptionPane.showMessageDialog(null, "Restart Button ");

}

if (e.getSource() == exitBtn) {

/* long start = System.currentTimeMillis();

long end = start + 4 * 1000; // 60 seconds * 1000 ms/sec

while (System.currentTimeMillis() < end) {

// run

new AePlayWave("sound/jet.wav").start();

}*/

System.exit(0);

}

}

}