수수께끼 고양이

String : equals, indexOf, contains, charAt, replaceAll, substring, toUpperCase, split, join StringBuffer : append, insert, substring ArrayList : add, get, size, contains, remove Hashmap : put, get, containsKey, remove, size, keySet

equals public class Main { public static void main(String[] args) { // equals String a = "hello"; String b = "java"; String c = "hello"; System.out.println(a.equals(b)); System.out.println(a.equals(c)); } } public class Main { public static void main(String[] args) { // equals String a = "hello"; String b = new String("hello"); System.out.println(a.equals(b)); System.out.println(a == b); } }