java - JFrame으로 구성한 쓰레드 원리 확인 프로그래스바 (Thread, JProgressBar)

package com.thread.sync;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JProgressBar;

import org.h2.constraint.Constraint;

public class ThreadGUI extends JFrame {

public ThreadGUI() {

setTitle("프로그래스바 - 스레드");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container contentPane = getContentPane();

contentPane.setLayout(new BorderLayout());

JProgressBar bar = new JProgressBar(0, 100);

bar.setValue(30);

bar.setStringPainted(true);

bar.setForeground(Color.GREEN);

//bar.setBorderPainted(true);

//bar.setIndeterminate(true);

JButton btn = new JButton("버튼");

btn.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

new Thread(new Runnable() {

@Override

public void run() {

synchronized (bar) {

for (int i=0; i<=100; i++) {

bar.setValue(i);

try {

Thread.sleep(20);

} catch (Exception e1) {

e1.printStackTrace();

}

}

}

} // run()

}).start();

}

});

contentPane.add(bar, BorderLayout.CENTER);

contentPane.add(btn, BorderLayout.SOUTH);

setLocationByPlatform(true);

setSize(400, 100);

setVisible(true);

}

public static void main(String[] args) {

new ThreadGUI();

}

}