Method Overloading vs Method Overriding in Java

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Overloading means multiple methods in the same class share a name but differ in parameter types or count — resolved at compile time. Overriding means a subclass provides its own implementation of a method inherited from the parent — resolved at runtime via dynamic dispatch. Overloading is compile-time polymorphism; overriding is runtime polymorphism.

Overloading and overriding are Java's two forms of polymorphism — they differ in when the method is selected: compile time vs runtime.

Overloading (compile-time):

Multiple methods with the same name but different parameter lists (types or count)
Compiler picks the matching overload at the call site based on argument types
Cannot overload by return type alone — the parameters must differ

Overriding (runtime):

Subclass provides its own implementation of an inherited method with the exact same signature
JVM uses dynamic dispatch: Animal a = new Dog(); a.speak() calls Dog's version at runtime
Rules: same or wider access, covariant return types allowed, fewer checked exceptions allowed

Gotchas:

Static methods are hidden, not overridden — dispatch uses the declared type, not the actual object type
Always use @Override — without it, a typo silently creates a new method instead of overriding

I recommend thinking of overloading as convenience (multiple ways to call the same behavior) and overriding as specialization (subclasses customizing inherited behavior).

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Interview answer

Overloading and overriding are Java's two forms of polymorphism — they differ in when the method is selected: compile time vs runtime.

Overloading (compile-time):

Multiple methods with the same name but different parameter lists (types or count)
Compiler picks the matching overload at the call site based on argument types
Cannot overload by return type alone — the parameters must differ

Overriding (runtime):

Subclass provides its own implementation of an inherited method with the exact same signature
JVM uses dynamic dispatch: Animal a = new Dog(); a.speak() calls Dog's version at runtime
Rules: same or wider access, covariant return types allowed, fewer checked exceptions allowed

Gotchas:

Static methods are hidden, not overridden — dispatch uses the declared type, not the actual object type
Always use @Override — without it, a typo silently creates a new method instead of overriding

I recommend thinking of overloading as convenience (multiple ways to call the same behavior) and overriding as specialization (subclasses customizing inherited behavior).

03 · Deep dive