Java 实例 计算矩形面积

在本教程中,我们将看到如何计算矩形面积

程序 1:

用户将在程序执行期间提供长度和宽度值,并根据提供的值计算面积。

/**
 * @author: BeginnersBook.com
 * @description: Program to Calculate Area of rectangle
 */
import java.util.Scanner;
class AreaOfRectangle {
   public static void main (String[] args)
   {
       Scanner scanner = new Scanner(System.in);
       System.out.println("Enter the length of Rectangle:");
       double length = scanner.nextDouble();
       System.out.println("Enter the width of Rectangle:");
       double width = scanner.nextDouble();
       //Area = length*width;
       double area = length*width;
       System.out.println("Area of Rectangle is:"+area);
   }
}

输出:

Enter the length of Rectangle:
2
Enter the width of Rectangle:
8
Area of Rectangle is:16.0

程序 2:

在上述程序中,将要求用户提供长度和宽度值。如果您不需要用户交互并且只想在程序中指定值,请参阅以下程序。

/**
 * @author: BeginnersBook.com
 * @description: Calculation with no user interaction
 */
class AreaOfRectangle2 {
   public static void main (String[] args)
   {
       double length = 4.5;
       double width = 8.0;
       double area = length*width;
       System.out.println("Area of Rectangle is:"+area);
   }
}

输出:

Area of Rectangle is:36.0
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Java 实例