A sample usage of the lambda syntax in Java 8.

SampleLambda.java

import java.util.function.Consumer;


public class SampleLambda {

    // takes a function object that, in turn, takes a String argument and returns Void;
    // this function object is a Consumer because it inherently returns nothing;
    // the alternative--Function<T,R>--must have a return type
    public static void foo(Consumer<String> func) {
        func.accept("foo");
    }

    public static void main(String[] args) {

        // using a variable-bound functor object
        Consumer<String> functor = input -> {
            System.out.println("lambda: " + input);
        };
        foo(functor);

        // using lambda syntax to create an anonymous, inline functor object
        foo( input -> { System.out.println("inline: " + input); } );

        System.exit(0);
    }

    /* output:
     *
     * lambda: foo
     * inline: foo
     */

}