Does a method's signature in Java include its return type?

Question

Does the method signature in a Java class/interface include its return type?

Example:

Does Java know the difference between those two methods:

public class Foo {     public int  myMethod(int param) {}     public char myMethod(int param) {} } 

Or is it maybe only the method name and parameters list that matter?

Answer 1

Quoting from Oracle Docs:

Definition: Two of the components of a method declaration comprise the method signature—the method's name and the parameter types.

Since the question was edited to include this example:

public class Foo {     public int  myMethod(int param) {}     public char myMethod(int param) {} } 

No, the compiler won't know the difference, as their signature: myMethod(int param) is the same. The second line:

    public char myMethod(int param) {} 

will give you can error: method is already defined in class, which further confirms the above statement.

Answer 2

Is class method signature in Java includes return type ?

In Java, it doesn't but in this JVM it does which can lead to obvious confusion.

Is interface method signature in Java includes return type ?

The same as for class methods.

Or only method name and parameters list ?

Method name and parameter types for Java. For example, the parameter annotations and names don't matter.