fredjohnson fredjohnson - 1 year ago 58
Java Question

Java interface with different method parameters

I want to have an interface that allows me to use methods with different parameters. Suppose I have an interface:

public interface Stuff {
public int Add();
}


And I have two classes A and B who implement the interface.

public class CLASS A implements Stuff{
public int Add(int id);
}


public class CLASS B implements Stuff{
public int Add(String name);
}


How can I achieve this?

Answer Source

You can write a generic interface for adding some type, something like this:

public interface Addable<T> {
    public int add(T value);
}

and then implement it via

public class ClassA implements Addable<Integer> {
    public int add(Integer value) {
        ...
    }
}

public class ClassB implements Addable<String> {
    public int add(String value) {
        ...
    }
}
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