자바 문자열

자바의 String에 대해 정리하려고 한다.

 

String str1 = "king";
String str2 = "king";
String str3 = new String("king");
String str4 = "k";


System.out.println("해쉬값 출력");
System.out.println(str1.hashCode());
System.out.println(str2.hashCode());
System.out.println(str3.hashCode());
System.out.println(str4.hashCode());

System.out.println("========================");
System.out.println("== , equals메소드 비교");

System.out.println(str1 == str2);   // true
System.out.println(str1.equals(str2)); // true
System.out.println(str1 == str3); // false
System.out.println(str1.equals(str3)); // true
System.out.println(str2 == str3); // false
System.out.println(str2.equals(str3)); // true
System.out.println(str1 == str4);   // false
System.out.println(str1.substring(0, 1).equals(str4));  // true

해쉬값 출력
3292055
3292055
3292055
107
========================
== , equals메소드 비교
true
true
false
true
false
true
false
true