[Java] 데이터 타입

public class Main {
    public static void main(String[] args) {
        System.out.println(6); //Number
        System.out.println("six"); //String

        System.out.println("6"); //String 6

        System.out.println(6+6); //12
        System.out.println("6"+"6"); //66

        System.out.println(6*6); //36
        //System.out.println("6"*"6"); ->문자열 * 연산 불가능

        System.out.println("1111".length());
        //System.out.println(1111.length()); ->숫자는 길이를 재는 연산 불가능
    }
}

 

https://www.youtube.com/watch?v=_D13-YBz4qk&list=PLuHgQVnccGMAIluRRVsC1e79ri-dwnBmR&index=15