Java和属性重载

Question

I'm stucked on this issue using eclipse 2018-12 (4.10) / Java 11 on debian 9

Let's state I've a base class

class A {

   private typeA prop;

   TypeA getProp(){
      return this.prop;
   }
}

and a derived one

class B extends A{
 private typeB prop;

 TypeB getProp(){
    return this.prop;
}

I'm expecting that prop in class B hides the prop in class A, but in eclipse I've got an error Message in class B for the getProp method : The return type is incompatible with A.getProp()

any idea ?

Answer 1

通过TypeA继承-> TypeB使用JB Nizet注释解决

Answer 2

you can try using interfaces like this:

interface Type {
    // ...
}

class TypeA implements Type {
    // ...
}

class TypeB implements Type {
    // ...
} 

class A {

   private TypeA prop;

   Type getProp(){
      return this.prop;
   }
}

class B extends A {

    private TypeB prop;

    Type getProp(){
        return this.prop;
    }
}