Java GUI之事件监听与解决

发布时间：2021-12-18 15:28:42 所属栏目：教程来源：互联网

导读：事件监听和处理的根本技术，是回调。甲方提供接口，乙方实现接口并调用相应方法。 package com.sinosuperman.driver; import Java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.aw

事件监听和处理的根本技术，是回调。甲方提供接口，乙方实现接口并调用相应方法。

package com.sinosuperman.driver;

import Java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class MainBench {
    public static void main(String[] args) {
        JFrame frame = new MyFrame();
    }
}

class MyFrame extends JFrame {
    private static final long serialVersionUID = 1L;
    Toolkit tk = Toolkit.getDefaultToolkit();
    Dimension d = tk.getScreenSize();
    JPanel panel;
    public MyFrame() {
        panel = new MyPanel();
        this.add(panel);
        this.setSize((int) d.getWidth() / 2, (int) d.getHeight() / 2);
        this.setLocation((int) (d.getWidth() - this.getWidth()) / 2, (int) (d.getHeight() - this.getHeight()) / 2);
        this.setResizable(false);
        this.setVisible(true);
    }
}

class MyPanel extends JPanel implements ActionListener {
    private static final long serialVersionUID = 5263963243638550398L;
    JButton okBtn;
    JButton exitBtn;
    public MyPanel() {
        this.setLayout(new FlowLayout(FlowLayout.CENTER));
        okBtn = new JButton("OK");
        exitBtn = new JButton("Exit");
        okBtn.addActionListener(this);
        exitBtn.addActionListener(this);
        this.add(okBtn);
        this.add(exitBtn);
    }
    public void actionPerformed(ActionEvent e) {
        Object source = e.getSource();
        if (source == okBtn) {
            JOptionPane.showMessageDialog(null, "You click the OK Button.");
        } else {
            JOptionPane.showMessageDialog(null, "You click the Exit Button.");
            System.exit(0);
        }
    }
}

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