Java 将当前时间保存为变量并从该值继续计数

我正在制作秒表，努力使停止功能正常工作

当我在7秒时停止计时器并重新启动时，它会回到0秒并重新开始；但是，我希望它在7秒开始。有时，秒表会断开并持续显示1.529679177849E9秒

我知道我需要将节省的时间存储在变量中，但我不知道如何存储

你能帮我解决这个问题吗

public class stopwatch {
    public long thetime = 0;
    public long stoppedtime = 0;
    public boolean ticking = false;


    public static void main(String[] args) {
        stopwatch s = new stopwatch();
        Scanner sc = new Scanner(System.in);
        boolean loop = true;
        while (loop = true) {
            System.out.println("1 start 2 is started 3 stop 4 "
                    + "reset 5 check time 6 stop");
            int i = sc.nextInt();
            if (i == 1) {
                s.start();
            } else if (i == 2) {
                System.out.println(s.isStarted());
            } else if (i == 3) {
                s.stop();
            } else if (i == 4) {
                s.reset();
            } else if (i == 5) {
                System.out.println("saved time is " + s.time() + " Seconds");
            } else if (i == 6) {
                System.out.println("closing");
                loop = false;
                break;
            } else {
                System.out.println("invalid");
            }

        }

    }

    public void start() {

        if (ticking == true) {
            thetime = thetime;
        } else {
            thetime = System.currentTimeMillis();
            ticking = true;
        }
    }

    public boolean isStarted() {
        return ticking;
    }

    public void stop() {
        if (ticking == false) {
            stoppedtime = stoppedtime;
        } else {
            stoppedtime = thetime;
            ticking = false;
        }
    }


    public void reset() {
        thetime = 0;
        stoppedtime = 0;
    }

    public double time() {
        double seconds = 1000.000000;
        double currenttime = 0;
        double saved = stoppedtime;
        if (ticking == true) {
            currenttime = ((System.currentTimeMillis() - thetime) / seconds);
            return currenttime;


        } else {
            currenttime = (stoppedtime / seconds);
            return currenttime;
        }

    }
}

---

我已经解决了一些问题，请查看下面的工作代码：

1） 返回时间时，stoppedtime未转换为秒

2） 只需在实际结果中添加停止时间，以确保在调用重置之前始终添加停止时间

3） 根据编码标准，类名应始终以大写字母开头

public class Stopwatch {
public long thetime = 0;
public long stoppedtime = 0;
public boolean ticking = false;
public int laps = 0;
public long lastTime = 0;

public static void main(String[] args) {
    Stopwatch s = new Stopwatch();
    Scanner sc = new Scanner(System.in);
    boolean loop = true;
    while (loop = true) {
        System.out.println("1 start 2 is started 3 stop 4 " + "reset 5 check time 6 stop");
        int i = sc.nextInt();
        if (i == 1) {
            s.start();
        } else if (i == 2) {
            System.out.println(s.isStarted());
        } else if (i == 3) {
            s.stop();
        } else if (i == 4) {
            s.reset();
        } else if (i == 5) {
            System.out.println("saved time is " + s.time() + " Seconds");
        } else if (i == 6) {
            System.out.println("closing");
            loop = false;
            break;
        } else {
            System.out.println("invalid");
        }

    }

}

public void start() {

    if (!ticking) {
        thetime = System.currentTimeMillis();
        ticking = true;
    }
}

public boolean isStarted() {
    return ticking;
}

public void stop() {
    if (ticking ) {
        stoppedtime += (System.currentTimeMillis() - thetime);
        ticking = false;
    }
}

public void reset() {
    thetime = System.currentTimeMillis();
    stoppedtime = 0;
}

public double time() {
    double seconds = 1000.000000;
    double currenttime = 0;
    if (ticking) {
        currenttime = (stoppedtime + System.currentTimeMillis() - thetime) / seconds;
        return currenttime;

    } else {
        currenttime = (stoppedtime / seconds);
        return currenttime;
    }

   }
 }

输出：

1 start 2 is started 3 stop 4 reset 5 check time 6 stop
5
saved time is 0.0 Seconds <-- Starting time to be zero
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
1 <-- Start time
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
3 <-- Stop Time
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
5
saved time is 1.304 Seconds <-- Time of stopwatch
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
1 <- Started time from 1.304 Seconds
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
5
saved time is 1.788 Seconds <- After immediately checking time post start as you can see timer started from previous recorded time
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
3 <- Stop time
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
5
saved time is 4.988 Seconds <--Combined time for Lap 1 + Lap 2
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
4 <- Reset time
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
5
saved time is 0.0 Seconds <- Time reset to 0 Seconds
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
1 <- Start time
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
3 <- Stop  time
1 start 2 is started 3 stop 4 reset 5 check time 6 stop
5
saved time is 0.796 Seconds <- Previous lap time not recorded as reset was done

1启动2启动3停止4重置5检查时间6停止
5.
节省的时间是0.0秒，非常感谢您的帮助，但这些更改并没有真正改变代码的功能。@j.doe它符合您的要求。请检查上面的输出，如果您多次启动和停止，记录的时间会被添加，但是如果您重置时间，它会再次将启动时间更改为零。再次测试您的代码，我注意到它有点工作，但如果在不停止的情况下重置计时器，则存在一个问题，保存的时间将永久存储为1.529749753663E9秒。除此之外，它似乎正在起作用。@j.doe要解决这个问题，只需将stop从重置为第一行两种方式都很简单，我简直不敢相信我从未想过，我在时间方法中添加了更多if语句，非常感谢，希望你周末过得愉快。你寻找过类似的问题吗？有一些。