How Does Java Resolve Method Name Collisions in Interface Implementations?

Method Name Collision Resolution in Java Interface Implementation

In Java, when multiple interfaces define methods with identical signatures, implementing them in a class can lead to ambiguity. Unlike C#'s explicit interface implementation, Java does not offer a direct solution to this issue.

To provide a resolution for this scenario, Java enforces that a class can provide only one implementation for a method with a certain signature. Therefore, implementing two different interfaces with identically named methods is not possible.

However, there are alternative approaches to handling this situation:

1. Composition:

   Instead of implementing both interfaces directly, create a composite class that contains instances of the two interfaces (e.g., ISomething and ISomething2). The composite class can delegate calls to the appropriate interface method, effectively separating the implementations.

   class CompositeClass {
       ISomething something1;
       ISomething2 something2;
   
       void doSomething1() {
           something1.doSomething();
       }
   
       void doSomething2() {
           something2.doSomething();
       }
   }

2. Adapter Design Pattern:

   Use an adapter class to adapt the method of one interface to the signature of the other. This allows for a more flexible implementation where the behavior can be customized based on the actual caller.

   class ISomethingAdapter implements ISomething2 {
   
       ISomething something;
   
       @Override
       public void doSomething() {
           // Custom behavior based on the caller
           something.doSomething();
       }
   }

By utilizing these alternative approaches, Java developers can effectively resolve method name collisions while maintaining the integrity of their code and avoiding ambiguity in method implementations.

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