Functional Interface

functional interface – an interface with a single abstract method. The Java API has many one-method interfaces such as Runnable, Callable, Comparator, ActionListener and others. They can be implemented and instantiated using anonymous class syntax.

Labmda expression

public interface Hello {
	public void sayHello(String who);
}

public interface Print<T> {
	public void print(T msg);
}

public static void main(String[] args) {
	Hello h = (String s) -> System.out.println(s);
	h.sayHello("Riguz");

	Print<Float> p = (f) -> {
		System.out.println(f);
		System.out.println("Labmda");
	};
	p.print(new Float(3.1415926f));

}

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