End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
자바(Java) 8: 람다식에서 콜론 두개 (:: - 이중 콜론 연산자, 메소드 참조 표현식)의 용도와 사용법 http://yoonbumtae.com/?p=2776