java - 如何使变量在后台每秒递增

Question

我的问题是我的代码中需要包含一个时钟。问题是，我不知道如何在不完全暂停整个代码的情况下每秒递增。有人可以告诉我更好的方法吗？或者有人可以告诉我在 java 中变量每秒可以增加多少次，这样我就可以使用 % 来计算时钟需要增加多少次。

代码:

int miniseconds = 0;
    int seconds = 00;
    int minutes = 00;
    int hours = 00;
    int day = 1;
    int month = 1;
    int years = 2280;
    int yearLeap = years % 4;
    long i;
    for (i = 1000000000; i>0; i--){
    seconds ++;
    try{
        Thread.sleep(1000);//2000ms = 2s
    }catch(InterruptedException ex){
    }
    if (seconds == 60){
        minutes ++;
        seconds =0;
    }

    if (minutes == 60){
        hours++;
        minutes = 0;
    }
    if (hours == 24){
        day++;
        hours = 0;
    }
    if (month == 1 && day == 32 ){
        month ++;
        day = 1;

    }
    if (month == 2 && day == 30 && yearLeap == 0) {
        month ++;
        day = 1;
    }
    if (month == 2 && day == 29 && yearLeap != 0){
        month ++;
        day = 1;
    }
    if (month == 3 && day == 32){
        month ++;
        day = 1;
    }
    if (month == 4 && day == 31){
        month ++;
        day = 0;
    }
    if (month == 5 && day == 32){
        month ++;
        day = 0;
    }
    if (month == 13){
        month = 1;
            years ++;
    }
    String date = "The current time is:  " +day+ "/" +month+ "/" +years+ "  " +hours+ ":" +minutes+ ":" +seconds;
    }

Answer 1

我在这个地址发现了以下 Java 计时器示例:http://www.asjava.com/swing/java-timer-tutorial/

该示例假设您正在使用 Java.Swing 库，并且您的应用程序需要 UI，而不是使用控制台。

<小时/>

ClockLabel.java

// An extension of the JLabel class that listens to events from a Timer object to
// update itself with the current date & time.
import java.util.Date;
import java.awt.event.*;
import javax.swing.*;

public class ClockLabel extends JLabel implements ActionListener {
  public ClockLabel( ) {
    super("" + new Date( ));
    Timer t = new Timer(1000, this);
    t.start( );
  }
  public void actionPerformed(ActionEvent ae) {
    setText((new Date( )).toString( ));
  }
}

<小时/>

ClockTest.java

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

public class ClockTest extends JFrame {
  public ClockTest( ) {
    super("Timer Demo");
    setSize(300, 100);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    ClockLabel clock = new ClockLabel( );
    getContentPane( ).add(clock, BorderLayout.NORTH);
  }

  public static void main(String args[]) {
    ClockTest ct = new ClockTest( );
    ct.setVisible(true);