Swing 예제

package pack.awt;

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

//Swing

//JFrame 상속

//Swing은 J만 앞에 붙여준다(JButton, JLabel...)

public class SwingTest1 extends JFrame implements ActionListener{

private static final long serialVersionUID = 1L;

JButton btn;

JLabel lbl;

int count;

public SwingTest1() {

btn = new JButton("클릭");

btn.setMnemonic(KeyEvent.VK_C); //단축키

btn.addActionListener(this);

JPanel pn = new JPanel();

pn.setLayout(new GridLayout(2,1)); //2행1열

pn.setBorder(BorderFactory.createEmptyBorder(30,30,10,30)); //여백주기

pn.add(btn);

lbl = new JLabel("버튼 클릭 수 : " + count);

pn.add(lbl);

getContentPane().add(pn, BorderLayout.CENTER); //가운데 정렬

setBounds(200,200,300,300);

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

@Override

public void actionPerformed(ActionEvent e) {

count++;

lbl.setText("버튼 클릭 수 : " + count);

}

public static void main(String[] args) {

new SwingTest1();

}

}

===================================================================================

package pack.awt;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

//JPanel 상속

public class SwingTest2 extends JPanel implements ActionListener{

private static final long serialVersionUID = 1L;

JButton btnR, btnG, btnB;

JMenuBar menubar;

JMenuItem menuMes, menuOk, menuInput;

JTextArea txtArea = new JTextArea("결과 출력", 10 ,50);

public SwingTest2() {

this.setLayout(new BorderLayout());

btnR = new JButton("Red");

btnG = new JButton("Green");

btnB = new JButton("Blue");

JPanel pn = new JPanel();

pn.add(btnR);

pn.add(btnG);

pn.add(btnB);

btnR.addActionListener(this);

btnG.addActionListener(this);

btnB.addActionListener(this);

this.add("South",pn); // 남쪽에 위치

this.add("Center",txtArea);

menuProcess();

}

private void menuProcess() {

menubar = new JMenuBar();

JMenu menu = new JMenu("Dialog test"); //인자 : 메뉴이름

menuMes = new JMenuItem("Message");

menuOk = new JMenuItem("menuOk");

menuInput = new JMenuItem("menuInput");

menu.add(menuMes);

menu.add(menuOk);

menu.add(menuInput);

menubar.add(menu);

//리스너 장착

menuMes.addActionListener(this);

menuOk.addActionListener(this);

menuInput.addActionListener(this);

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getSource() == btnR){

txtArea.setBackground(Color.RED);

}else if(e.getSource() == btnG){

txtArea.setBackground(Color.GREEN);

}else if(e.getSource() == btnB){

txtArea.setBackground(Color.BLUE);

}else if(e.getSource() == menuMes){

JOptionPane.showMessageDialog(this, "메시지", "알림", JOptionPane.INFORMATION_MESSAGE); //다이얼로그 창(alert창)

}else if(e.getSource() == menuOk){

int re = JOptionPane.showConfirmDialog(this, "버튼 선택","골라",JOptionPane.YES_NO_CANCEL_OPTION); // 예 아니오 취소 창

switch (re) {

case JOptionPane.YES_OPTION:txtArea.append("\n예 선택"); break;

case JOptionPane.NO_OPTION:txtArea.append("\n노 선택"); break;

case JOptionPane.CANCEL_OPTION:txtArea.append("\n취소"); break;

default:break;

}

}else if(e.getSource() == menuInput){

String str = JOptionPane.showInputDialog(this,"이름 입력","정확히"); // 텍스트를 입력할 수 있는 창(문자열로 리턴)

JOptionPane.showMessageDialog(this, "입력값 : " + str);

}

}

public static void main(String[] args) {

JFrame frame = new JFrame("대화상자 연습");

SwingTest2 test2 = new SwingTest2(); //JPanel

//... JPanel이 여러개 있다고 가정

frame.getContentPane().add(test2, "Center"); // 가운데 정렬

frame.setJMenuBar(test2.menubar);

frame.setBounds(200,200,400,300);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}