Runtime Polymorphism

Method Overriding + Dynamic Binding = Runtime Polymorphism

aka Dynamic Method Dispatch.

• Method Overriding - Which Method to call depends on object type
• ++
• Dynamic Binding - Object type determined at runtime
• => Which method to call - decided at runtime
• -> Runtime Polymorphism

Object being referred to determines the version of method to be called

The object being referred to (not the reference variable) determines the version of method to be called.

So in this example, if Student has a method overriding a method in Human. Student's method will be called because even though h is an object of Human, it is referring to an object of Student.

Human h = new Student();
h.overriddenMethod();

References

GFG - Dynamic Method Dispatch or Runtime Polymmorphism in Java

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Backlinks

• Open Recursion (cs)
• Shadowing/Hiding (cs)
• Upcasting (cs)
• Dynamic Binding (cs)