Class extends two interface which have method in common name

A class implements two interfaces. Those interfaces have method in common name.
For ex;
public interface b{public void hello();}
public interface c{public void hello();}
public class a implements b,c
public void hello(){}
Since two interfaces have common method, How to differentiate in this case ?

How to differentiate what? You have to provide a method called hello(), just as in your example. (Normally you would have code in the method body, but zero lines of code is not against the rules.)

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