Java Program to Display Execution Time of Program

In java we can find the execution time of program using built in method calledSystem.currentTimeMillis()

long time = System.currentTimeMillis();

// returns the current time in the long value

Example : Finding execution time of Linear Search Program

Steps

• import java.text.DecimalFormat and java.text.NumberFormat class
• Get the time before writting linear search logic
• Write linear search logic
• Get the time after the linear search program
• Display the formatted time using given formula in numberformat

import java.text.DecimalFormat;
import java.text.NumberFormat;

public class ExecutionTimeEx 
{
	void search()
	{
		boolean flag=false;
		int list[] = {12,90,11,30,33},search=0,i=0,loc=0;
		
		System.out.println("Array elements are ");
		for(i=0;i<list.length;i++)
			System.out.println("list["+i+"] = "+list[i]);
		
		search = 30;
	
		for(i=0;i<list.length;i++)
		{
			if(list[i] == search) 
			{
				flag=true;
				loc=i; 
				break; 
			}
			else
				flag=false;
		}
		if(flag)
			System.out.println(search+" found at location "+loc);
		else
			System.out.println(search+" not found in list");
	}
	public static void main(String[] args) 
    {
		long start = System.currentTimeMillis(); // get start time

		new ExecutionTimeEx().search();
		
		long end = System.currentTimeMillis(); // get end time

		NumberFormat formatter = new DecimalFormat("#0.00000 ");
		System.out.print("Execution time is " + formatter.format((end - start) / 1000d) + " seconds");
	}
}

Output