[2019-1] 자바프로그래밍 과제

스레드를 이용하여 디지털 시계 만들기

import javax.swing.*;
import java.awt.*;
import java.util.Calendar;
public class DigitalClockTest extends JFrame{
 private JLabel label;
 
 class MyThread extends Thread{
  public void run() {
    Calendar now = Calendar.getInstance();
    int hrs = now.get(Calendar.HOUR_OF_DAY);
    int min = now.get(Calendar.MINUTE);
    int sec = now.get(Calendar.SECOND);
    String time = hrs+":"+min+":"+sec;
    
    for(;;) { //계속 반복
     label.setText(Integer.toString(hrs)+":"+(Integer.toString(min)+":"+(Integer.toString(sec))));
     sec++;
    if(sec==60) { //60초가 되면 분으로 넘어감
     sec=0;
     min++;
    }
    if(min==60) { //60분이 되면 시간으로 넘어감
     min=0;
     hrs++;
    }
    try {
     Thread.sleep(1000);
    } catch (InterruptedException e) {
     e.printStackTrace();
    }
    label.setText(time);
    }
  }
 }
 
 public DigitalClockTest() {
  setTitle("디지털시계");
  setSize(400,150);
  label = new JLabel();
  label.setFont(new Font("Serif", Font.BOLD, 100));
  add(label);
  setVisible(true);
  (new MyThread()).start();
 }
 
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  DigitalClockTest t = new DigitalClockTest();
 }
}