思考题练习
慕粉3235270
2016-06-01 18:47
package com.imooc;
public abstract class Shape {
public abstract void perimeter();//求周长
public abstract void area();//求面积
}package com.imooc;
import java.util.Scanner;
public class Rectangle extends Shape {
public void perimeter() {
Scanner input = new Scanner(System.in);
System.out.println("请输入矩形的宽：");
float width = input.nextFloat();
System.out.println("请输入矩形的长：");
float length=input.nextFloat();
System.out.println("矩形的周长为："+2*(width+length));
}
public void area() {
Scanner input = new Scanner(System.in);
System.out.println("请输入矩形的宽：");
float width=input.nextFloat();
System.out.println("请输入矩形的长：");
float length=input.nextFloat();
System.out.println("矩形的面积为："+width*length);
}
}package com.imooc;
import java.util.Scanner;
public class Circle extends Shape {
public void perimeter() {
Scanner input = new Scanner(System.in);
System.out.println("请输入圆形的半径：");
float radius=input.nextFloat();
System.out.println("圆形的周长为："+radius*2*3.14);
}
public void area() {
Scanner input = new Scanner(System.in);
System.out.println("请输入圆形的半径：");
float radius=input.nextFloat();
System.out.println("圆形的面积："+3.14*radius*radius);
}
}package com.imooc;
public class Initial {
public static void main(String[] args) {
Shape s1=new Rectangle();
s1.perimeter();
s1.area();
Shape s2=new Circle();
s2.perimeter();
s2.area();
}
}3回答
-
- 炫之舞者
- 2016-06-02 14:07:36
可以使用一个方法简写直接输出周长和面积
public abstract class Shape {
public abstract void get();//求周长和面积
}
import java.util.Scanner;
public class Rectangle extends Shape {
public void get() {
Scanner input = new Scanner(System.in);
System.out.println("请输入矩形的宽：");
float width = input.nextFloat();
System.out.println("请输入矩形的长：");
float length=input.nextFloat();
System.out.println("矩形的周长为："+2*(width+length));
System.out.println("矩形的面积为："+width*length);
}
}
import java.util.Scanner;
public class Circle extends Shape {
public void get() {
Scanner input = new Scanner(System.in);
System.out.println("请输入圆形的半径：");
float radius=input.nextFloat();
System.out.println("圆形的周长为："+radius*2*3.14);
System.out.println("圆形的面积："+3.14*radius*radius);
}
}
public class Initial {
public static void main(String[] args) {
Shape s1=new Rectangle();
s1.get();
Shape s2=new Circle();
s2.get();
}
}
-
- qq_硬汉_5
- 2016-06-06 18:12:05
哥们感觉你少了input.close（）;这个语句，没有这个语句会报错在我这
-
- qq_硬汉_5
- 2016-06-06 17:40:32
为什么我打 public class Rectangle extends Shape 这个代码时系统开始报错啊
Java入门第二季 升级版
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