初学java 编写求正方形/长方形的周长与面积，正方体/长方体 的表面积与体积

hcz888

复习了九天java，分享一下代码  

[Java] 纯文本查看 复制代码

package aaa;[/color][/size]

public interface PlaneGraphics2 {
public abstract double area();
public abstract double perimeter();
public abstract void print();
}

[Java] 纯文本查看 复制代码

package aaa;

public interface SolidGraphics1 {
public abstract double volume(); 
}

[Java] 纯文本查看 复制代码

package aaa;

public class Rectangle2 implements PlaneGraphics2
{
        protected double length;
        protected double width;
        
        Rectangle2(double length,double width){
                this.length=length;
                this.width=width;
        }
        Rectangle2(double length)
        {
                this.length=length;
        }
        Rectangle2(){
                this(0,0);
        }
        Rectangle2(Rectangle2 r1)
        {
                this(r1.length,r1.width);
        }
        public double perimeter()
        {
                return 2*(this.length+this.width);
        }
        public double area(){
                return this.length*this.width;
        }
        public void print(){
                if(this.length==this.width){
                        System.out.println("正方形，"+"边长是："+this.length);
                }
                else{
                        System.out.println("长方形，"+"长是："+this.length+"宽是："+this.width);
                }
                System.out.println("周长是："+this.perimeter()+"面积是："+this.area());
        }
        
}

[Asm] 纯文本查看 复制代码

package aaa;

public class Cuboid1 extends Rectangle2 implements SolidGraphics1 {

        protected double height;
        
        Cuboid1(double length,double width,double height){
                this.length=length;
                this.width=width;
                this.height=height;
        }
        Cuboid1(Rectangle2 r1,double height){
                super(r1.length,r1.width);
                this.height=height;
        }
        Cuboid1(double length){
                this(length,length,length);
        }
        Cuboid1(){
                this(0,0,0);
        }
        public double perimeter(){
                return 0;
        }
        public double area(){
                return length*width*2+length*height*2+width*height*2;
        }
         public double volume()   {
                return super.area()*this.height;
        }
        public void print(){
                if(this.length==this.width&&this.width==this.height){
                        System.out.println("一个正方体"+"，边长为"+this.length);
                }
                else{
                        System.out.println("一个长方体"+"，长为"+this.length+
                                        "宽为"+this.width+"高为"+this.height);
                }
                System.out.println("，体积为"+this.volume()+"表面积"+this.area());
        }
}

[Java] 纯文本查看 复制代码

package aaa;

public class C_ex {
public static void main(String args[])
{
        PlaneGraphics2 s1=new Cuboid1(10,10,10);
        s1.print();
        PlaneGraphics2 s2=new Rectangle2(10,100);
        s2.print();
}
}

美丽的渗透者

这个挺简单的，谢谢楼主

QingYi.

C_ex
有这么定义类的?

神幻静

给新入坑的小伙伴鼓励

fht000

你这SolidGraphics1不应该继承PlaneGraphics2接口吗？或者Cuboid1同时实现这2个接口。反而Cuboid1去继承Rectangle2类，不符合面向接口编程的理念

救赎之旅

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