import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ButtonDemo extends JFrame
         implements ActionListener{
  private JButton btnLeft;
  private JButton btnRight;
  private JButton btnUp;
  private JButton btnDown;
  private JTextField tfMove;
  int x,y;//用于控制文本框的顯示位置
  private JPanel movePanel;
  private Container container = getContentPane();
  public ButtonDemo() {
    super("位圖按鈕");
    setSize(260, 200);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //創建向移動的圖格按鈕
    Icon icLeft=new ImageIcon("left.gif");
    btnLeft=new JButton(icLeft);
    //注冊監聽器
    btnLeft.addActionListener(this);
    //設置提示字符串
    btnLeft.setToolTipText("控制文本向左移動");
    //設置向右移動的按鈕
    Icon icRight=new ImageIcon("right.gif");
    btnRight=new JButton(icRight);
    btnRight.addActionListener(this);
    btnRight.setToolTipText("控制文本向右移動");
    //設置向上移動的按鈕
    Icon icUp=new ImageIcon("Up.gif");
    btnUp=new JButton(icUp);
    btnUp.addActionListener(this);
    btnUp.setToolTipText("控制文本框向上移動");
    //設置向下移動的按鈕
    Icon icDown=new ImageIcon("Down.gif");
    btnDown=new JButton(icDown);
    btnDown.addActionListener(this);
    btnDown.setToolTipText("控制文本框向下移動");
    tfMove=new JTextField("位圖按鈕示例");
    movePanel=new JPanel();
     }
     public void setLayout(){
       container.setLayout(new BorderLayout());
       container.add(btnLeft,BorderLayout.WEST);
       container.add(btnRight,BorderLayout.EAST);
       container.add(btnUp,BorderLayout.NORTH);
       container.add(btnDown,BorderLayout.SOUTH);
       //設置移動面板的布局為null;
       movePanel.setLayout(null);
       movePanel.add(tfMove);
       //設置文本框的顯示位置
       x=0;
       y=0;
       tfMove.setBounds(x,y,80,20);
       container.add(movePanel,BorderLayout.CENTER);
     }
  public static void main(String[] args) {
    ButtonDemo frame = new ButtonDemo();
    frame.setLayout();
    frame.show();
  }
  public void actionPerformed(ActionEvent e) {
   if (e.getSource() ==btnRight){
     x+=2;//控制文本框在水平方向上向右移動
   }
   if (e.getSource()==btnLeft){
     x-=2;//向左移動
   }
   if(e.getSource()==btnUp){
     y-=2;//向上移動
   }
   if(e.getSource()==btnDown){
     y+=2;//向下移動
   }
   //重新調整文本框的位置
   tfMove.setBounds(x,y,80,20);
  }
}