用java设计一个长方形类，成员变量包括长和宽.方法：计算面积和周长，有相应的set和get方法

用java设计一个长方形类，成员变量包括长和宽.方法：计算面积和周长，有相应的set和get方法

class Rectangle{

private double width;

private double height;


public Rectangle(double width, double height){
this.width = width;
this.height = height;
}


public double getArea(){
return this.width * this.height;
}


public double getGirth(){
return 2 * (this.width + this.height);
}

public double getWidth(){
return this.width;
}

public void setWidth(double width){
this.width = width;
}

public double getHeight(){
return this.height;
}

public void setHeight(double height){
this.height = height;
}
}

public class Test {
public static void main(String[] args){
Rectangle rect = new Rectangle(2,3);
System.out.println("长方形的宽 ：" + rect.getWidth());
System.out.println("长方形的高 ：" + rect.getHeight());
System.out.println("长方形的面积：" + rect.getArea());
System.out.println("长方形的周长：" + rect.getGirth());
}
}

public class Rectangle
{
private double length;
private double width;
public void setEdge()
{
this.length=3;
this.width=4;
}
public double getArea()
{
return(this.length*this.width);
}
public double getCircumference()
{
return((this.length+this.width)*2);
}
public static void main(String args[])
{
Rectangle b=new Rectangle();
b.setEdge();
System.out.println("the area is "+b.getArea());
System.out.println("the circumference is "+b.getCircumference());
}
}