What happens if two methods have the same name and argument list but different return types?

• A. It is valid and the compiler will choose based on return type.
• B. It will lead to ambiguity and a compile-time error.
• C. Only one of the methods will be executed.
• D. It will work only if they are in different classes.

Answer: (B)

If two methods in a class have the same name and the same argument list, they are referred to as method overloads. However, the return type alone does not qualify as part of the method's signature for the purpose of overloading. Therefore, having two methods that differ only in their return types but have identical names and argument lists will create an ambiguity for the compiler.

When you attempt to call such a method, the compiler will not be able to determine which method to invoke, as it relies on the method's name and parameter types to resolve method calls. Since both methods match the criteria for a call, the compiler generates an ambiguity error, leading to a compile-time error. This ensures clarity and predictability in method invocation, preventing potential runtime errors.

The other options suggest scenarios that do not accurately reflect how method overloading functions or how the Java compiler resolves method calls, hence they do not provide correct insights regarding this programming language feature.