java 创建子类和构造函数

来源：百度知道 编辑：UC知道 时间：2024/05/30 08:18:01
Class S
{
Double r;
}
编写S类的一个子类，该子类中包含一个计算圆面积的方法area()和一个使用super()初始化S类成员的构造方法

class SS extends S
{
private double m ;
public double area() {方法体自己写}

public SS(double m,double r)
{
super(r)
this.m=m ;
}
}
//OK ..

package com.test.www;

public class Father {
private Double r;

public Double getR() {
return r;
}

public void setR(Double r) {
this.r = r;
}

public Father() {
}

public Father(Double r) {
this.r = r;
}
}

package com.test.www;

public class Son extends Father {

public static void main(String[] args) {

Son one = new Son();
one.getArea(2.5);
}

public Son() {
super();
// TODO Auto-generated constructor stub
}

public Son(Double r) {
super(r);
// TODO Auto-generated constructor stub
}
public void getArea(double r){
double T = 3.1415;<