编写一个java应用程序,定义一个接口,包括一个方法areas(),在rectangle勒,squ

发布网友发布时间：2022-05-23 01:26

共2个回答

热心网友时间：2023-10-09 16:39

public interface Shape{
void areas();

}
public class Rectangle implement Shape{
public void areas(){
System.out.println("the area of rectangle");

}
public class Square implement Shape{
public void areas(){
System.out.println("the area of square");

}
public class Round implement Shape{
public void areas(){
System.out.println("the area of round");

}

public class Test{
public static void main(String[] args){
Shape r =new Rectangle();
Shape s =new Square();
Shape round =new Round();
r.areas();
s.areas();
round.areas();
}

}

}

完全手打的，只是给你一个思路

热心网友时间：2023-10-09 16:39

import static java.lang.Math.*;

import java.util.*;
interface Shape{
void areas();

}
class rectangle implements Shape{
float h,w;

public rectangle(float h,float w){
this.h=h;
this.w=w;

}
public void areas(){

System.out.println("rectangle 面积为:"+h*w);
}

}
class square implements Shape{
float h;

public square(float h){
this.h=h;
}
public void areas(){

System.out.println("square 面积为:"+h*h);
}

}

class round implements Shape{
float r;

public round(float r){
this.r=r;
}
public void areas(){

System.out.println("round 面积为:"+PI*r*r);
}

}

class test{
public static void main(String[]args){

rectangle r=new rectangle(5,3);
square s=new square(5);
round ro=new round(3);

r.areas();

s.areas();

ro.areas();

}

}