Question

用java编程求长方形和正方形的面积

Answer 1

/**
*
* @author 摆渡凌云
*/
public class Main {

//应用举例
public static void main(String[] args) {

Rectangle rect = new Rectangle(13,34);
Rectangle square = new Rectangle(13);
System.out.println("长为: " + rect.getLength() +" 宽为:"+rect.getWidth() +" 的长方形面积为:" + rect.getArea());
System.out.println("边长为:" + square.getLength() +" 的正方形面积为:"+square.getArea());

//静态方法调用
System.out.println("长方形的面积" + Rectangle.getArea(23,34));
}
}

//长方形（正方形）类
class Rectangle {

private double length = 0.0; //长
private double width = 0.0; //宽

public double getLength() {
return length;
}

public double getWidth() {
return width;
}

//构造长方形
public Rectangle(double length , double width) {
this.length = length;
this.width = width;
}

//构造正方形
public Rectangle(double side) {
this(side,side);
}

//获得面积方法
public double getArea()
{
return length * width;
}
//静态方法,可以直接调用返回长方形（正方形的面积）
//x 长方形的长， y长方形的宽
public static double getArea(double x,double y)
{
return x*y;
}

}

Answer 2

public float(float a,float b){
return a*b;
}

Answer 3

public folat getS(float a,float b){
float c;
c=a*b;
return c;
}