Is method hiding a form of Polymorphism?

问题

Polymorphism is the ability to take many forms. Method overriding is runtime polymorphism.

My questions are:

Is there anything like static polymorphism in Java?
Can method hiding be considered a form of polymorphism?

In this question's answer, it is said that static methods are not polymorphic. What is the reason for that?

回答1:

If we run this test

class A {
    static void x() {
        System.out.println("A");
    }
}

class B extends A {
    static void x() {
        System.out.println("B");
    }
}

class Test {
    public static void main(String[] args) throws Exception {
        A a = new B();
        a.x();
    }
}

it will print A. If method x() were polymorphic, it would print B.

回答2:

Polymorphism at runtime takes the form of "dynamic dispatch". That is, the actual method that gets called is determined based on the actual instance you are invoking the method on. Obviously, this applies only when you have an instance of a class, so strictly speaking, polymorphism does not apply to hiding of static methods. For further explanation of the difference check here.

回答3:

Polymorphism could be static and dynamic both. Overloading is static polymorphism while, overriding is dynamic polymorphism. Overloading in simple words means two methods having same method name but takes different input parameters. This called static because, which method to be invoked will be decided at the time of compilation Overriding means a derived class is implementing a method of its super class.

回答4:

Polymorphism

Static Binding/Early binding/Compile time binding - Method overloading.(in same class)
Dynamic binding/Runtime binding/Method overriding.(in different classes.)

Polymorphism in java

It just has two types, Method overloading and Method overriding, as soon as the method overriding turn into Method Hiding, it loses it's polymorphism features.

refer to below question from stackoverflow.

1.) Question1

2.) Question2

回答5:

I believe Method Hiding would technically be considered polymorphic. By definition, a hidden method has the same signature, or form, as one found in its base class. This is just one of its "many forms". Think of it as Overloading... that happens to "override" the exact same signature. This would be static polymorphism.

来源：https://stackoverflow.com/questions/28711259/is-method-hiding-a-form-of-polymorphism

标签

java

polymorphism

overriding