So berechnen Sie die verstrichene / ausgeführte Zeit in Java
In Java können Sie die verstrichene Zeit in Java auf folgende Weise messen.
1. System.nanoTime()
Dies ist die empfohlene Lösung zum Messen der verstrichenen Zeit in Java.
ExecutionTime1.java
package com.example.time;
import java.util.concurrent.TimeUnit;
public class ExecutionTime1 {
public static void main(String[] args) throws InterruptedException {
//start
long lStartTime = System.nanoTime();
//task
calculation();
//end
long lEndTime = System.nanoTime();
//time elapsed
long output = lEndTime - lStartTime;
System.out.println("Elapsed time in milliseconds: " + output / 1000000);
}
private static void calculation() throws InterruptedException {
//Sleep 2 seconds
TimeUnit.SECONDS.sleep(2);
}
}
Die Ausgabe kann variieren.
2004
2. System.currentTimeMillis()
ExecutionTime2.java
package com.example.time;
import java.util.concurrent.TimeUnit;
public class ExecutionTime2 {
public static void main(String[] args) throws InterruptedException {
long lStartTime = System.currentTimeMillis();
calculation();
long lEndTime = System.currentTimeMillis();
long output = lEndTime - lStartTime;
System.out.println("Elapsed time in milliseconds: " + output);
}
private static void calculation() throws InterruptedException {
//Sleep 2 seconds
TimeUnit.SECONDS.sleep(2);
}
}
Die Ausgabe kann variieren.
2006
3. Instant.now().toEpochMilli()
In Java 8 können Sie die neuenjava.time.Instant ausprobieren
ExecutionTime3.java
package com.example.time;
import java.time.Instant;
import java.util.concurrent.TimeUnit;
public class ExecutionTime3 {
public static void main(String[] args) throws InterruptedException {
long lStartTime = Instant.now().toEpochMilli();
calculation();
long lEndTime = Instant.now().toEpochMilli();
long output = lEndTime - lStartTime;
System.out.println("Elapsed time in milliseconds: " + output);
}
private static void calculation() throws InterruptedException {
//Sleep 2 seconds
TimeUnit.SECONDS.sleep(2);
}
}
Die Ausgabe kann variieren.
2006
4. Date (). GetTime ()
ExecutionTime4.java
package com.example.time;
import java.util.Date;
import java.util.concurrent.TimeUnit;
public class ExecutionTime4 {
public static void main(String[] args) throws InterruptedException {
long lStartTime = new Date().getTime();
calculation();
long lEndTime = new Date().getTime();
long output = lEndTime - lStartTime;
System.out.println("Elapsed time in milliseconds: " + output);
}
private static void calculation() throws InterruptedException {
//Sleep 2 seconds
TimeUnit.SECONDS.sleep(2);
}
}
Die Ausgabe kann variieren.
2007