Question

How to check elapsed milliseconds using Thread.Sleep in for loop with Java

Answer 1

public class Program {
    public static void testSpeed(int ms) {
        long currentTime = System.currentTimeMillis();

        for (int i = 0; i < 1000; i++) {
            try {
                Thread.sleep(ms);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt(); // restore interrupt status
                System.out.println("Sleep interrupted at iteration " + i);
                return;
            }
        }

        System.out.println("Executed in " + (System.currentTimeMillis() - currentTime) + " ms");
    }

    public static void main(String[] args) {
        testSpeed(1);
    }
}



/*
run:

Executed in 1090 ms

*/

 

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Answer 2

import java.util.concurrent.TimeUnit;

public class Program {
    public static void testSpeed(int ms) {
        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 1000; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(ms); // Sleeps for ms milliseconds
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt(); // Restore interrupt status
                System.out.println("Sleep interrupted");
                return;
            }
        }

        long elapsed = System.currentTimeMillis() - startTime;
        System.out.println("Executed in " + elapsed + " ms");
    }
    
    public static void main(String[] args) {
        testSpeed(1);
    }
}



/*
run:

Executed in 1080 ms

*/

 

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