1초에 한 번씩 시간 업데이트하여 계속 출력하기

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Timer;
import java.util.TimerTask;

public class timer {

	public static void main(String[] args) {
		Thread01 th01 = new Thread01();
		Timer timeStart = new Timer();
		timeStart.schedule(th01, 1000, 1000);
	}
	
}

class Thread01 extends TimerTask {
	
	public void run() {
		
		Calendar cal = new GregorianCalendar();
		int y, m, d, h, m1, s;
		
		y = cal.get(Calendar.YEAR);
		m = cal.get(Calendar.MONTH)+1;
		d = cal.get(Calendar.DATE);
		h = cal.get(Calendar.HOUR);
		m1 = cal.get(Calendar.MINUTE);
		s = cal.get(Calendar.SECOND);
		
		int[] timeArr1 = {y, m, d, h, m1, s};
		String[] timeArr2 = {"년 ", "월 ", "일 ", "시 ", "분 ", "초"};
		
		for (int i=0; i<timeArr1.length; i++) {
			System.out.print(timeArr1[i] + timeArr2[i]);
		}
		
		System.out.println();
		
	}
	
}

 

 

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

public class timer {

	public static void main(String[] args) {

		Timer t = new Timer();
		Tictoc tt = new Tictoc();
		tt.schedule(tt, 1000, 1000);
		
	}

}

class Tictoc extends TimerTask {
	public void run() {
		printDays();
	}
	private void printDays() {
		Calendar cal = Calendar.getInstance();
		System.out.print(cal.get(Calendar.YEAR)+"년 ");
		System.out.print(cal.get(Calendar.MONTH)+"월 ");
		System.out.print(cal.get(Calendar.DATE)+"일 ");
		System.out.print(cal.get(Calendar.HOUR)+"시 ");
		System.out.print(cal.get(Calendar.MINUTE)+"분 ");
		System.out.println(cal.get(Calendar.SECOND)+"초");
		
	}
}

 

 

 

 

 

 

 

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AWT 패키지를 이용하여 새 창으로 띄우기 (JFrame, JLabel, Thread, LocalDateTime)

 

import java.awt.*;
import java.time.*;
import javax.swing.*;

class TimeNow implements Runnable {
	private JLabel laTime;
	
	public TimeNow (JLabel laTime) {
		this.laTime = laTime;
	}
	
	@Override
	public void run () {
		while (true) {
			LocalDateTime now = LocalDateTime.now();
			int year = now.getYear();
			int month = now.getMonthValue();
			int day = now.getDayOfMonth();
			int hour = now.getHour();
			int minute = now.getMinute();
			int second = now.getSecond();
			
			int[] nowArr1 = {year, month, day, hour, minute, second};
			String[] nowArr2 = {".", ".", " ", ":", ":", ""};
			String timeText = "";
			
			for (int i=0; i<nowArr1.length; i++) {
				timeText += Integer.toString(nowArr1[i])+nowArr2[i];
			}
				
			laTime.setText(timeText);
		}
	}
} // TimeNow class end

public class goHome extends JFrame {
	
	private Container c;
	private JLabel laTime;
	
	private void initObject() {
		c = getContentPane();
		laTime = new JLabel("");    // 타이머 값이 출력될 레이블
	}
	
	private void initSetting() {
		c.setLayout(new FlowLayout());
		laTime.setFont(new Font("Century Schoolbook", Font.BOLD, 80));
		setTitle("정각 알리미");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setSize(900,160);
		
		Toolkit tk = Toolkit.getDefaultToolkit();
		Dimension screenSize = tk.getScreenSize();
		
		setLocation(screenSize.width / 4*3-300, screenSize.height / 4*3);
	}
	
	private void initBatch() {
		c.add(laTime);
	}
	
	private void getTime() {
		Thread t1 = new Thread(new TimeNow(laTime));
		t1.start();
	}
	
	public goHome() {
		initObject();	// 객체 생성
		initSetting();	// 객체 속성 변경
		initBatch();	// 객체 배치
		getTime();	// 현재 시간 정보를 받아오는 스레드 실행
		setVisible(true);
	}

	public static void main(String[] args) {
		
		new goHome();
	}

}

 

 

 

참고 :

 

https://blog.naver.com/chmh0805/222154216588

https://blog.naver.com/jiae7634/222837488965