Lambda Expression in Java 8

Introduction

Lambda expression is used to replace one method classes/interface with inline code.

Syntax

(arg1, arg2...) -> { body }

• Declaring the types of the parameters is optional.
• Using parentheses around the parameter is optional if you have only one parameter.
• Using curly braces is optional (unless you need multiple statements).
• The “return” keyword is optional if you have a single expression that returns a value.

Examples

        new Thread(() -> {
            System.out.println("Hello from runnable.");
        }).start();

        List<String> s = Arrays.asList(new String[] { "foo", "bar", "code" });
        Collections.sort(s, (String s1, String s2) -> {
            return s1.compareTo(s2);
        });

        Collections.sort(s, (s1, s2) -> s1.compareTo(s2));

        for (String i : s) {
            System.out.println(i);
        }

Reference

http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/Lambda-QuickStart/index.html