Here's a simple Java program that calculates the area and perimeter of a rectangle. It includes clear comments to explain each part:

// This program demonstrates basic arithmetic operations in Java
// to calculate properties of a rectangle (area and perimeter)
public class RectangleCalculator {
    public static void main(String[] args) {
        // Define dimensions of the rectangle (sample values)
        double length = 5.5;
        double width = 3.2;

        // Calculate area of rectangle: length * width
        double area = length * width;

        // Calculate perimeter of rectangle: 2 * (length + width)
        double perimeter = 2 * (length + width);

        // Print results to the console
        System.out.println("Rectangle Dimensions:");
        System.out.println("Length = " + length + " units");
        System.out.println("Width = " + width + " units");
        System.out.println("Area = " + area + " square units");
        System.out.println("Perimeter = " + perimeter + " units");
    }
}

When you run this program, it will output:

Rectangle Dimensions:
Length = 5.5 units
Width = 3.2 units
Area = 17.6 square units
Perimeter = 17.4 units

This program is beginner-friendly and shows core Java concepts like variables, basic arithmetic, and printing output. You can modify the length and width values to test different rectangles!

作者声明:本文包含人工智能生成内容。