자바 이벤트 ActionListener, 독립클래스, 멤버내부클래스, 지역내부클래스, 익명클래스

package test;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

// 독립클래스

class MyActionListener implements ActionListener {

JTextField tf;

JFrame frame;

MyActionListener(JTextField tf) {

this.tf = tf;

}

public void setFrame(JFrame frame) {

this.frame = frame;

}

@Override

public void actionPerformed(ActionEvent e) {

JButton btn = (JButton) e.getSource();

if (btn.getText().equals("Action")) {

btn.setText("액션");

frame.setTitle("액션");

} else {

btn.setText("Action");

frame.setTitle("Action");

}

String str = tf.getText();

System.out.println(str);

} // actionPerformed()

} // MyActionListener

public class Test1 extends JFrame {

public Test1() {

setTitle("Action 이벤트 리스너 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new FlowLayout());

JButton btn = new JButton("Action");

JTextField tf = new JTextField(10);

tf.setText("안녕하세요");

MyActionListener l = new MyActionListener(tf);

l.setFrame(this);

btn.addActionListener(l);

c.add(tf);

c.add(btn);

setSize(350, 150);

setVisible(true);

}

public static void main(String[] args) {

new Test1();

}

} // Test1

package test;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class Test2 extends JFrame {

JButton btn;

JTextField tf;

public Test2() {

this.setTitle("Action 이벤트 리스너 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new FlowLayout());

btn = new JButton("Action");

tf = new JTextField(10);

tf.setText("안녕하세요");

btn.addActionListener(new MyActionListener());

c.add(tf);

c.add(btn);

setSize(350, 150);

setVisible(true);

} // Test2 생성자

// static이 아닌(non-static)

// 멤버 내부클래스

// static이 아닌 내부클래스는 해당 객체가 생성될 때 메모리에 클래스정보가 올라온다.

class MyActionListener implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

if (btn.getText().equals("Action")) {

btn.setText("액션");

Test2.this.setTitle("액션");

} else {

btn.setText("Action");

setTitle("Action");

}

String str = tf.getText();

System.out.println(str);

}

} // class MyActionListener

public static void main(String[] args) {

new Test2();

}

} // class Test2

package test;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.ArrayList;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

import test.Test2.MyActionListener;

public class Test2_1 extends JFrame {

JButton btn;

JTextField tf;

// List list = new ArrayList<>();

// 익명의 멤버 내부클래스

ActionListener listener = new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

if (btn.getText().equals("Action")) {

btn.setText("액션");

Test2_1.this.setTitle("액션");

} else {

btn.setText("Action");

setTitle("Action");

}

String str = tf.getText();

System.out.println(str);

}

};

public Test2_1() {

this.setTitle("Action 이벤트 리스너 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new FlowLayout());

btn = new JButton("Action");

tf = new JTextField(10);

tf.setText("안녕하세요");

btn.addActionListener(listener);

c.add(tf);

c.add(btn);

setSize(350, 150);

setVisible(true);

}

public static void main(String[] args) {

new Test2_1();

}

}

package test;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class Test3 extends JFrame {

public Test3() {

this.setTitle("Action 이벤트 리스너 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new FlowLayout());

JButton btn = new JButton("Action");

JTextField tf = new JTextField(10);

tf.setText("안녕하세요");

// 지역 내부클래스

class MyActionListener implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

if (btn.getText().equals("Action")) {

btn.setText("액션");

Test3.this.setTitle("액션");

} else {

btn.setText("Action");

setTitle("Action");

}

String str = tf.getText();

System.out.println(str);

}

} // class MyActionListener

btn.addActionListener(new MyActionListener());

c.add(tf);

c.add(btn);

setSize(350, 150);

setVisible(true);

}

public static void main(String[] args) {

new Test3();

}

}

package test;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class Test3_1 extends JFrame {

public Test3_1() {

this.setTitle("Action 이벤트 리스너 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new FlowLayout());

JButton btn = new JButton("Action");

JTextField tf = new JTextField(10);

tf.setText("안녕하세요");

// ActionListener listener = new ActionListener() {

// @Override

// public void actionPerformed(ActionEvent e) {

// if (btn.getText().equals("Action")) {

// btn.setText("액션");

// Test3_1.this.setTitle("액션");

// } else {

// btn.setText("Action");

// setTitle("Action");

// }

//

// String str = tf.getText();

// System.out.println(str);

//

// }

// };

// btn.addActionListener(listener);

// 익명의 지역 내부클래스

btn.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

if (btn.getText().equals("Action")) {

btn.setText("액션");

Test3_1.this.setTitle("액션");

} else {

btn.setText("Action");

setTitle("Action");

}

String str = tf.getText();

System.out.println(str);

}

});

c.add(tf);

c.add(btn);

setSize(350, 150);

setVisible(true);

}

public static void main(String[] args) {

new Test3_1();

}

}