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);
    }
}