Question

java编程 定义s的子类，有一个计算圆的面积的方法area和调用super的初始化

Answer 1

class S{
public S(){
System.out.println("初始化");//构造方法
}
}

public class Child extends S{
public Child(){//子类构造方法调用子类
super();
}
public double getArea(double i){//i是半径
return i*i*3.14;
}
}

Answer 2

class S(){
public S(){
System.out.println("S,我是父类");
}
}

public class ChildS() extends S{
public Childs(){
super();
}
private float getArea(float i){//i是半径
reutrn i*i*3.14
}
}