What is meant by method overriding and how does JVM decide at run time which method to call?

Method overriding occurs when we try to call a overridden method on the parent reference which is holding child object. Because we are calling the method on parent reference so at compile time method get resolved from parent reference type so, for the compiler, the method of parent is getting called.

Why does overriding happen at runtime?

Answer to why method overriding is called runtime polymorphism in java is because the methods get resolved at the Run-Time. In simple words, when you execute a program, the method of which class out of many will be called, if they have overridden the method. You may read more about method overriding in java.

What happens when you override a method?

The ability of a subclass to override a method allows a class to inherit from a superclass whose behavior is “close enough” and then to modify behavior as needed. An overriding method can also return a subtype of the type returned by the overridden method.

Which type determines which overriding method is used at runtime?

When an overridden method is called through a reference of parent class, then type of the object determines which method is to be executed. Thus, this determination is made at run time. Since both the classes, child class and parent class have the same method animalSound .

What are override methods?

An override method provides a new implementation of the method inherited from a base class. The method that is overridden by an override declaration is known as the overridden base method. An override method must have the same signature as the overridden base method. You cannot override a non-virtual or static method.

Why method overriding is called runtime polymorphism in Java explain with an example?

Runtime polymorphism in java is also known as Dynamic Binding or Dynamic Method Dispatch. In this process, the call to an overridden method is resolved dynamically at runtime rather than at compile-time. Runtime polymorphism is achieved through Method Overriding.

Why would you override a method of a base class?

The main advantage of method overriding is that the class can give its own specific implementation to a inherited method without even modifying the parent class code.

Why method overriding is called runtime polymorphism?

why overriding is called run time polymorphism? subclass methods will be invoked at runtime. subclass object and subclass method overrides the Parent class method during runtime. its called because it depend on run time not compile time that which method will be called.

Which of the following factors should be considered while overriding a method?

12 Rules of Overriding in Java You Should Know

• Rule #1:Only inherited methods can be overridden.
• Rule #2:Final and static methods cannot be overridden.
• Rule #3: The overriding method must have same argument list.
• Rule #4: The overriding method must have same return type (or subtype).

Where did you use method overriding in your project?

Method overriding feature gives ability to a child class to define its own behavior if It does not want to use parent class behavior. Meaning, a child class can write a method with same name that is also in base class and implement it. it is called method overriding in java oops.

Why method overriding is compile time polymorphism?

Method overloading is the compile-time polymorphism where more than one methods share the same name with different parameters or signature and different return type. Method overriding is the runtime polymorphism having same method with same parameters or signature, but associated in different classes.

How does JVM differentiate between method overloading and method overriding internally?

I would like to know how does JVM differentiates between method overloading and method overriding internally. The JVM only deals with method overriding. A method is overridden by adding a method with the same signature in a derived class (the only allowed difference is in the return type, which is allowed to be more specific).

How do you handle method overloading in Java?

Method overloading is handled by the compiler (that’s why known as static binding) while overriding is handled by JVM. Overloaded methods are different and can be recognized separately based on the argument list, that’s why they get resolved by the compiler at compile time.

What is the difference between JVM and JRE in Java?

JVM (Java Virtual Machine) acts as a run-time engine to run Java applications. JVM is the one that actually calls the main method present in a java code. JVM is a part of JRE (Java Runtime Environment).

What are the different areas of the JVM?

1 Method area: In the method area, all class level information like class name, immediate parent class name, methods and variables information etc. 2 Heap area: Information of all objects is stored in the heap area. 3 Stack area: For every thread, JVM creates one run-time stack which is stored here.