What does the syntax mean in Java: new Stream(){ … }?

Question

I have encountered the following Java syntax that I don\'t recognize.

This part is fine:

public abstract class Stream implements Iterator

        

Answer 1

This is providing an inline (anonymous) subclass of the Stream class.

Functionally, it is the same as:

public NewClass extends Stream {
    public Integer next() {  
       return 1; 
    }  
}

and

void someMethodInAnotherClass {
    Stream stream = new NewClass();
}

but as this class definition isn't used outside the method body, you can define it as anonymous.