[Java] String - 문자열<->배열 변환(toCharArray(), getBytes(), new String())

1. toCharArray() - String -> char[]

String str = "Hello World";

char[] charArr = str.toCharArray();

2. getBytes() - String -> byte[]

String str = "Hello World";

byte[] byteArr = str.getBytes();

3. new String() - 배열 -> String

char[] charArr = {'H','e','l','l','o'};

String str = new String(charArr);