メソッドの実行時間を計算するJavaプログラム

この記事では、メソッドの実行時間を計算する方法を理解します。実行時間は、終了時間と開始時間を差し引いて計算されます。

以下は同じのデモンストレーションです-

入力

入力が-

Run the program

出力

必要な出力は-

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

アルゴリズム

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

例1

ここでは、整数は事前に定義されており、その値にアクセスしてコンソールに表示されます。

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");
   }
}

出力

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

例2

ここでは、整数は事前に定義されており、その値にアクセスしてコンソールに表示されます。

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");
   }
}

出力

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