防止子类覆盖父类中的方法

Question

I have a main class RecordFieldBase . There many subclasses in the application that extend from RecordFieldBase class. The base RecordFieldBase class exposes public method updateInspector , it looks like this:

public Inspector udpateInspector {
  if () {
    return this.getBasicInspector();
  } else {
    return this.getValidationInspector();
  }
}

The application will call updateInspector on the child RecordField instances to get an instance of Inspector. Each subclass can have custom basic and validation inspectors. They can implement it using getBasicInspector and getValidationInspector methods, but they must not override updateInspector of the base class as it contains the handling logic.

Is using final keyword appropriate here?

public final Inspector udpateInspector {
  if (some check here) {
    return this.getBasicInspector();
  } else {
    return this.getValidationInspector();
  }
}

Answer 1

是的，这正是Java对方法使用final修饰符的原因。

Answer 2

yes... take a look at the doc...

https://docs.oracle.com/javase/tutorial/java/IandI/final.html

the idea of final methods is to block overriding it from child classes...