【JAVA】按钮组件

流布局 为按钮添加监听事件  

方法一：

抽象类与接口 

package JAVA20190514;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class TestJFrame extends JFrame {

    JPanel jp;
    JButton jbSave;
    JButton jbCancel;
    JTextField tx1;
    JTextField tx2;
    
    public TestJFrame(){
        super("窗口");
        jp = new JPanel();
        tx1 = new JTextField(5);
        tx2 = new JTextField(5);
        jbSave = new JButton("保存");
        jbCancel = new JButton("取消");
        add(jp);
        jp.add(jbSave);
        jp.add(jbCancel);
        jp.add(tx1);
        jp.add(tx2);
        setVisible(true);
        setBounds(500, 500, 500, 500);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        jbSave.addActionListener(new JbSaveAction());
        jbCancel.addActionListener(new JbCancelAction());

    }
    
    class JbSaveAction implements ActionListener{
        public void actionPerformed(ActionEvent e) {
            tx1.setText("保存按钮");        
        }        
    }
    
    class JbCancelAction implements ActionListener{
        public void actionPerformed(ActionEvent e) {
            tx2.setText("取消按钮");        
        }        
    }
        
    public static void main(String[] args) {
        TestJFrame ceshi =new TestJFrame();   
    }
}

方法二：

package 外来;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestJFrame2 extends JFrame {

    JPanel jp;
    JButton jbSave;
    JButton jbCancel;
    JTextField tx1;
    JTextField tx2;
    
    public TestJFrame2(){
        super("窗口");
        jp = new JPanel();
        tx1 = new JTextField(5);
        tx2 = new JTextField(5);
        jbSave = new JButton("保存");
        jbCancel = new JButton("取消");
        add(jp);
        jp.add(jbSave);
        jp.add(jbCancel);
        jp.add(tx1);
        jp.add(tx2);
        setVisible(true);
        setBounds(500, 500, 500, 500);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        jbSave.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                tx1.setText("点击了保存按钮");    
            }});
        jbCancel.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                tx2.setText("点击了取消按钮");    
            }});
    }
    public static void main(String[] args) {
        TestJFrame ceshi =new TestJFrame();   
    }
}