JFrame button, checkbox, textfield 예제

package com.oraclejava.exam3;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JCheckBox;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class JaFrm3 extends JFrame {

JButton btn;

JTextField txt;

JCheckBox cbx;

public JaFrm3(String sTitle) {

setTitle(sTitle);

setLayout(null); //기본 레이아웃 정지

setSize(250, 160);

setDefaultCloseOperation(EXIT_ON_CLOSE);

txt = new JTextField("");

txt.setBounds(80, 20, 100, 20);

add(txt);

setVisible(true);

cbx = new JCheckBox("English");

cbx.setBounds(80, 60, 80, 20);

add(cbx);

btn = new JButton("인사");

//btn.addActionListener(new MyActionListener());

//익명 클래스

/*

btn.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if(cbx.isSelected()) {

txt.setText("Hello");

} else {

txt.setText("안녕하세요.");

}

}

});

*/

// Lamdba식

btn.addActionListener( e -> {

if(cbx.isSelected()) {

txt.setText("Hello");

} else {

txt.setText("안녕하세요.");

}

});

add(btn);

btn.setBounds(80, 80, 60, 25);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

JaFrm3 ja = new JaFrm3("오라클자바");

}

// inner class

class MyActionListener implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

// 버튼클릭 시 

if(cbx.isSelected()) {

txt.setText("Hello");

} else {

txt.setText("안녕하세요.");

}

}

}

}