java-1

需求：写一个求矩形面积的java程序，要求有主类(Example1)和一个矩形类(Rect)，方法(getArea)写在Rect类中，主类用于输入、调用、输出。

code：

import java.util.Scanner;

public class Rect {
    double width;    

    double height;    

    double getArea(){
        return width*height;    

    }
}

class Example1{
    public static void main(String args[]){
        Rect rectangle;        

        rectangle = new Rect();        

        //Rect rectangle = new Rect();        

        Scanner reader = new Scanner(System.in);
        System.out.println("input the width : ");        

        rectangle.width = reader.nextDouble();        

        System.out.println("input the height : ");        

        rectangle.height = reader.nextDouble();
        double area = rectangle.getArea();        

        System.out.print("The area of the rectangle is "+area);    

        }
}