java中方法square,形式参数为双精度类型

如题所述

public class Polymorphism{
public static void main(String[] args) {
A b = new B();
b.fb();
}
}

[java] view plain copy
class A {
public A(){

}
public void fa() {
System.out.println("CLASS A :Function fa Runing......");
}

public void fb() {
System.out.println("CLASS A :Function fb Runing......");
fa();
System.out.println("CLASS A :Function fb Stop......");
}
}

[java] view plain copy
class B extends A {
public B(){
}
public void fa() {
System.out.println("CLASS B :Function fa Runing......");
}

public void fb() {
System.out.println("CLASS B :Function fb Runing......");
super.fb();
System.out.println("CLASS B :Function fb Stop......");
}
}

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