java - 自午夜以来的总秒数，Java

Question

我对编程真的很陌生。我正在做一项 Java 入门作业。在我的作业中，我们需要找到自午夜以来的总秒数，并将该数字更改为小时、分钟和秒以显示当前时间。我有一个小问题。当我测试我的代码时，总秒数显示 0!任何帮助，将不胜感激。抱歉，代码很困惑

        package clock;
import java.text.DecimalFormat;
import java.util.Calendar;  // to get current time

public class Clock {
    public static int totalseconds;
    public static int seconds;
    public static int minutes;
    public static int hours;

    public static int test;

    public Clock(int hours, int minutes, int seconds )  {
        setHours(hours);
        setMinutes(minutes);
        setSeconds(seconds);
    }


    // use current time
    public Clock() {
        Calendar c = Calendar.getInstance();
        long now = c.getTimeInMillis();
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        long passed = now - c.getTimeInMillis();
        long secondsPassed = passed / 1000;
        totalseconds =  (int) secondsPassed;


    }


    public void tick() {
        addSecond();
    }

    private void addSecond() {
        seconds = totalseconds%60;
    }

    private void addMinute() {
        minutes = totalseconds/60 % 60;
    }

    private void addHour() {
        hours = totalseconds / 3600; 
    }

    public String toString() {
        DecimalFormat f = new DecimalFormat("00");
        return f.format(hours) + ":" + f.format(minutes) + ":" + f.format(seconds);
    }

    public int getHours() {
        return hours;
    }
    public int getMinutes() {
        return minutes;
    }
    public int getSeconds() {
        return seconds;
    }

    // the total number of minutes sinces midnight
    public int getTotalMinutes() {
        return totalseconds / 60 % 60;
    }

    // the total number of seconds since midnight 
    public int getTotalSeconds() {
        return totalseconds;
    }

    public void setHours(int hours) {
        if (hours > 23 || hours < 0) {
            this.hours = 0;
        }
        else
            this.hours = hours;
    }
    public void setMinutes(int minutes) {
        if (minutes > 59 || minutes < 0)
            this.minutes = 0;
        else
            this.minutes = minutes;
    }
    public void setSeconds(int seconds) {
        if (seconds > 59 || seconds < 0)
            this.seconds = 0;
        else
            this.seconds = seconds;
    }

    // reset hours, minutes and seconds to zero
    public void reset() {
        hours = minutes = seconds = 0;
    }
    public static void main(String [] args){

        System.out.println("this is total seconds " + test + totalseconds );
    }


}

Answer 1

将 main 更改为此。

public static void main(String [] args){
    Clock clock = new Clock();
    System.out.println("this is total seconds " + test + totalseconds );
}

新建一个 Clock 实例并调用构造函数，所有的魔法都在这里发生。