listenercreateframe.java

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package listener;

import javax.swing.*;
import java.awt.*;

public class ListenerCreateFrame extends JFrame {

  private static final long serialVersionUID = 1L;
  private JPanel jContentPane = null;
  private JButton jButton = null;

  public ListenerCreateFrame() {
    super();
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    initialize();
  }

  public static void main(String[] args) {
    ListenerCreateFrame frame = new ListenerCreateFrame();
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    frame.setLocation((screenSize.width - frameSize.width) / 2,
        (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  
  private void initialize() {
    this.setSize(300, 200);
    this.setContentPane(getJContentPane());
    this.setTitle("事件接收器创建的应用");
  }

  private JPanel getJContentPane() {
    if (jContentPane == null) {
      jContentPane = new JPanel();
      jContentPane.setLayout(null);
      jContentPane.add(getJButton(), null);
    }
    return jContentPane;
  }

  private JButton getJButton() {
    if (jButton == null) {
      jButton = new JButton();
      jButton.setBounds(new Rectangle(87, 53, 114, 43));
      jButton.setText("按钮事件");
      //加入动作接收器
      jButton.addActionListener(new java.awt.event.ActionListener() {
        //单击事件
        public void actionPerformed(java.awt.event.ActionEvent e) {
          javax.swing.JOptionPane.showMessageDialog(null, "按钮被单击");
        }
      });
    }
    return jButton;
  }
}