有没有办法判断 java 中哪个孩子 class 称为父母的 function？

Question

我有两个类扩展相同的 class，例如：

abstract class A {
//functions
}
class B extends A {
//functions
}
class C extends A {
//functions
}

I would like a function in the parent class to change it's behavior depending on which child class is calling the function, for example, a function in class A will execute a different if statement depending on which child class calls the function. 有没有办法让父 class 知道哪个子构造函数正在使用它的 function？

Answer 1

当然，这里是 go：

abstract class A {
// abstract functions
public void myCoolFunction(){
    if(this.getClass().equals(B.class)){
      System.out.println("B!");
    }else{
      System.out.println("NOT B!");
    }
  }
}

class B extends A {
//functions
}

class C extends A {
//functions
}

测试它：

jshell> C c = new C();
c ==> C@6d4b1c02

jshell> c.myCoolFunction();
NOT B!

jshell> B b = new B();
b ==> B@4883b407

jshell> b.myCoolFunction();
B!

顺便说一句，这种技术通常是代码味道或糟糕的设计。