Top 75 Java Interview - Can a class implement two interfaces that have methods with same name ?
💡 Java Tricky Interview Question 10
What happens if a class implements two interfaces that both contain methods with the same name and signature? 🤔 Will Java allow it, or will it lead to a compilation error? In this video, we’ll break it down step by step and show you the correct way to handle such situations!
🔥 What You’ll Learn in This Video:
✅ Can a class implement multiple interfaces with identical method signatures?
✅ What happens if both interfaces have a method with the same name?
✅ How does Java handle this scenario, and does it cause ambiguity?
✅ How to resolve conflicts if both interfaces have default methods
✅ Best practices for working with multiple interfaces
📌 Quick Answer:
✔️ Yes, a class can implement two interfaces that declare methods with the same name and signature.
🚫 No, it does NOT cause a compilation error as long as the methods have no default implementation.
Here’s why:
🔹 If both interfaces only declare the method (without default implementation), the implementing class just needs to provide one implementation that satisfies both.
🔹 If both interfaces contain a default method with the same name, Java will throw a compilation error due to ambiguity—and you must explicitly override it in the class to resolve the conflict.
🔹 If one interface has a default method and the other does not, the class inherits the default method unless overridden.
✔️ How to Handle Conflicts:
1️⃣ Explicitly override the conflicting method in the implementing class.
2️⃣ Use `InterfaceName.super.methodName()` to specify which default method to call.
3️⃣ Avoid method signature clashes by designing interfaces carefully.
⚠️ Important Notes:
⚠️ No conflict occurs if both interfaces only declare the method (without a body).
⚠️ If both interfaces have default methods with the same name, you must override them.
⚠️ Use `InterfaceName.super.methodName()` to resolve default method conflicts.
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