java_lambda_functional_interface.java

interface Nameable {
	String getName();
}

public class Test {

	public static void main(String[] args) {
		Nameable nameable1 = "String"::toString;
		hello(nameable1);
		
		

		hello("String"::toString);
		
		

		Nameable nameable2 = () -> "yourname";
		hello(nameable2);
		
		

		hello(() -> "yoruname2");
		

		// hello(() -> 111 ); // compile error
	}

	public static void hello(Nameable n) {
		System.out.println("hello " + n.getName());
	}
}