Understanding the Time Taken to Execute a Task

Understanding the Time Taken to Execute a Task

There are situations when we need to understand the time taken for executing a section of code. We are also aware that System.currentTimeMillis() provides a good estimate of time.

System.nanoTime() is a more accurate version of time and can be used as below.

public class ExecuteTask{    public static void main(String args[])    {        executeTask();    }        private static void executeTask()    {        //Capturing the start time        long startTime = System.nanoTime();         System.out.println("Start time: " + startTime);        //Execute the task        for (int i=0;i         {            //do nothing        }        //Capturing the end time        long endTime = System.nanoTime() - startTime;         System.out.println("End time: " + endTime);    }}
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