title: Java JFrame background color not working
body: <p>I tried using:</p>
  
  <pre><code>frame1.getContentPane().setBackground(Color.yellow);
  </code></pre>
  
  <p>But it is not working. Can anyone help me?</p>
  
  <pre><code>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);
      }
  }
  </code></pre>
  
  <h2>GameFrame</h2>
  
  <pre><code>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 &lt;= 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() &lt; end) {
          // run
          new AePlayWave("sound/jet.wav").start();
          }*/
  
          System.exit(0);
  
      }
  
  
      }
  }
  </code></pre>