What is the implementation mechanism of java polymorphism?

The implementation mechanism of Java polymorphism:

The implementation mechanism of Java polymorphism is that reference variables defined by the parent class or interface can point to subclasses Or an instance object of an implementation class, and the method called by the program is dynamically bound during runtime. It refers to the method of the specific implementation object pointed to by the variable, that is, the method of the object running in the memory, rather than the type of the reference variable. method defined in.

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Essence:

1. Compile-time polymorphism (also known as static Polymorphism)

2. Run-time polymorphism (also known as dynamic polymorphism)

1. Compile-time polymorphism

Overload ) is an example of compile-time polymorphism. Compile-time polymorphism is determined at compile time, and the determined method is called at runtime.

What we usually call polymorphism refers to runtime polymorphism, that is, it is not sure which specific method to call at compile time, and it is delayed until runtime. This is why polymorphic methods are sometimes called deferred methods.

2. Runtime polymorphism

There are usually two implementation methods:

1. Subclass inherits parent class (extends)

2. Class implementation interface (implements)

No matter which method is used, the core lies in the rewriting of the parent class method or the implementation of the interface method to obtain different executions at runtime. Effect.

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