There is no constructor for interface in Java?

Question

In Java, if I have an interface:

public interface MyInterface{
}

Then MyInterface implementation is:

class MyC         


        

Answer 1

You are correct. An interface may not specify a constructor, the constructor gets specified in the class that implements the interface.

public interface Foo {
    public void doSomething();
}


public class Bar implements Foo() {
    public Bar(int value) {
    }

    @Override
    public void doSomething() {
    }
}

then when you want to use your interface you need to do something like

Foo foo = new Bar(2);