如何将整数拆分为字符串并按秒/分钟/小时自动转换

Question

I have set and displayed a timer on GUI.

I want the program to Save the time and load it. I did it successfully but, I Want whenever the program start, to load the previou time.

ms is Milliseconds that every so if it passes 1000 it converts it to 1 seconds and get's the value of 0 again. I Have created a second (millisecondTimer) as (score) to display and not change it to 0. The score doesn't reset's itself until the timer stops.

I Want to grab the score and extract in with an order to get the values of:

Minutes / Seconds / Milliseconds .

I Have tried to extract it or divide it by different numbers but it's too difficult to me :/

Simply, I want to automatically detect the length of a score and get the Minutes, seconds and milliseconds on a String and display it after on JLabel .

I could create other integers as milliBackup , secondsBackup , minuteBackup . and pass them separately to miliseconds/seconds/minutes. But I want to do it in this way if it is able.

public void beginTimer() {

            score++;
            ms++;

            if(ms==1000) {

                ms = 0;
                s++;

                if(s>59) {

                    s = 0;
                    m++;

                    if(m>59) {

                        timer.cancel();

                    }
                }

            }

            lblTimer.setText(displayTimer());

        }

and DisplayTimer has:

public String displayTimer() {
            return String.format("%02d:%02d:%03d", m, s, ms);
        }

Answer 1

You don't say how you're updating the method. If you're calling Thread.sleep , extra care should be used. There are better methods. But using your code:

// bad use of static but once you'll get it working, change it
static long s = 1;
static long m = 1;
static long ms = 1;

// the method is not beginTimer but updateTimer and goes inside a
// loop or something which calls it agan and again
public void updateTimer() {

        if(ms==1000L) {                  
            ms = 0;
            s++;  

            if(s==60L) {                      
                s = 0;
                m++; 

                if(m==60L) {                          
                    timer.cancel();                         
                }
            }                   
        }               
        lblTimer.setText(displayTimer());               
    }

Answer 2

How to calculate minutes (m), seconds (s), and milliseconds (ms) from score :

ms = score; 
s = ms / 1000; // integer div
ms = ms % 1000; // remainder
m = s / 60; // integer div
s = s % 60; // remainder