JAVA新手提问编译时一直显示Square是抽象的，无法实例化，可是Square的类我没有抽象啊，为什么Circle行

发布网友发布时间：2022-05-10 18:37

共1个回答

热心网友时间：2023-10-22 05:31

package com.tx.day;

abstract class Graph {
double r;
final double pi = 3.14;
int length;
int wide;

public Graph(double r) {
this.r = r;
}

public Graph(int length, int wide) {
this.length = length;
this.wide = wide;
}

public abstract void GetArea();

public abstract void GetLong();
}

class Circle3 extends Graph {

public Circle3(double r) {
super(r);
}

@Override
public void GetArea() {
System.out.println("圆形的面积为:" + pi * r * r);
}

@Override
public void GetLong() {
{
System.out.println("圆形的周长为:" + 2 * pi * r);
}

}
}

class Square extends Graph {
public Square(int length, int wide) {
super(length, wide);
}

public void GetArea() {
System.out.println("矩形的面积为:" + wide * length);
}

public void GetLong() {
System.out.println("矩形的周长为:" + 2 * (wide + length));
}
}

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

Circle3 c = new Circle3(3.0);
c.GetLong();
c.GetArea();

Square s = new Square(2, 4);
s.GetArea();
s.GetLong();
}
}

JAVA新手提问 编译时一直显示Square是抽象的，无法实例化，可是Square的类我没有抽象啊，为什么Circle行

JAVA新手提问编译时一直显示Square是抽象的，无法实例化，可是Square的类我没有抽象啊，为什么Circle行