Java Program to Calculate the Execution Time of Methods

In this article, we will understand how to calculate the execution time of methods. Time of execution is calculated by substracting End time and start time.

Below is a demonstration of the same −

Input

Suppose our input is −

Run the program

Output

The desired output would be −

The program is being executed:
The Execution time of the program is: 620872 nanoseconds

Algorithm

Step 1 - START
Step 2 - Declare 3 long values namely my_start_time, my_end_time and my_execution_time.
Step 3 - Start time of the program is recorded using the function System.nanoTime() and assigned to variable my_start_time.
Step 4 - Similarly end time of the program is recorded using the function System.nanoTime() and assigned to variable my_end_time
Step 5 - Total execution time of the program is calculated by my_end_time - my_start_time. Store the value in my_execution_time.
Step 6 - Display the result
Step 7 - Stop

Example 1

Here, the integer has been previously defined, and its value is accessed and displayed on the console.

public class Main {
   public static void main(String[] args) {
      long my_start_time, my_end_time, my_execution_time;
      my_start_time = System.nanoTime();
      System.out.println("The program is being executed:");
      my_end_time = System.nanoTime();
      my_execution_time = my_end_time - my_start_time;
      System.out.println("The Execution time of the program is: " + my_execution_time + " nanoseconds");
   }
}

Output

The program is being executed:
The Execution time of the program is: 129621 nanoseconds

Example 2

Here, the integer has been previously defined, and its value is accessed and displayed on the console.

public class Main {
   public static void main(String[] args) {
      long my_start_time, my_end_time, my_execution_time;
      my_start_time = System.nanoTime();
      int my_input_1 = 100;
      int my_input_2 = 250;
      int my_sum = my_input_1 + my_input_2;
      System.out.println("The program is being executed:");
      my_end_time = System.nanoTime();
      my_execution_time = my_end_time - my_start_time;
      System.out.println("The Execution time of the program is: " + my_execution_time + "  nanoseconds");
   }
}

Output

The program is being executed:
The Execution time of the program is: 103801 nanoseconds