buttondemo.java

Java 程序设计源码 只提供了部分

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.Container;
import javax.swing.ImageIcon;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import javax.swing.Icon;


public class ButtonDemo extends JFrame
    implements ActionListener{
  private JButton jbLeft;
  private JButton jbRight;
  private JButton jbUp;
  private JButton jbDown;
  private JTextField jtfMove;

  int x, y;

  private JPanel movePanel;

  private Container container = getContentPane();

  public static void main(String[] args) {
    ButtonDemo bd = new ButtonDemo();
    bd.setLayout();
    bd.setVisible(true);
  }

  public ButtonDemo()
  {
    super("位图按钮");
    setSize(260,200);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //创建图片按钮
    ImageIcon icLeft = new ImageIcon("left.gif");
    jbLeft = new JButton(icLeft);
    //注册监听器
    jbLeft.addActionListener(this);
    //设置提示字符串
    jbLeft.setToolTipText("控制文本向左移动");

    //创建图片按钮
    ImageIcon icRight = new ImageIcon("right.gif");
    jbRight = new JButton(icRight);
  //注册监听器
    jbRight.addActionListener(this);
  //设置提示字符串
    jbRight.setToolTipText("控制文本向右移动");

    //创建图片按钮
    ImageIcon icUp = new ImageIcon("up.gif");
    jbUp = new JButton(icUp);
  //注册监听器
    jbUp.addActionListener(this);
  //设置提示字符串
    jbUp.setToolTipText("控制文本向上移动");

    //创建图片按钮
    ImageIcon icDown = new ImageIcon("down.gif");
    jbDown = new JButton(icDown);
  //注册监听器
    jbDown.addActionListener(this);
  //设置提示字符串
    jbDown.setToolTipText("控制文本向下移动");

    jtfMove = new JTextField("位图按钮示例");
    movePanel = new JPanel();
  }

  public void setLayout(){
    container.setLayout(new BorderLayout());

    container.add(jbLeft,BorderLayout.WEST);
    container.add(jbRight,BorderLayout.EAST);
    container.add(jbUp,BorderLayout.NORTH);
    container.add(jbDown,BorderLayout.SOUTH);

    movePanel.setLayout(null);
    movePanel.add(jtfMove);

    x = 0;
    y = 0;

    jtfMove.setBounds(x, y, 80, 20);
    container.add(movePanel, BorderLayout.CENTER);
  }

  public void actionPerformed(ActionEvent e){
    if(e.getSource() == jbLeft){
      x -= 2;
    }
    else if(e.getSource() == jbRight){
      x += 2;
    }
    else if(e.getSource() == jbUp){
      y -= 2;
    }
    else if(e.getSource() == jbDown){
      y += 2;
    }

    jtfMove.setBounds(x, y, 80, 20);
  }
}