public class Main {
    public static void main(String[] args) {
    	  String str1 = "Programming"; 
          String str2 = "Programming";
          String str3 = new String("Programming");
          
          System.out.println(str1==str2);
          System.out.println(str1==str3);
          System.out.println(str1.equals(str3));
          System.out.print(str2.equals(str3));
    }
}

// str1, str2는 같은 값이기떄문에 같은 주소를 바라 (String Pool 주소)
// == : 주소까지 확인
// equals : 값 확인

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