StringBuilder.reverse()

StringBuilder.reverse() : StringBuilder 클래스의 reverse() 메서드를 이용해 문자열 뒤집기

public class Main {
    public static String reverse(String str) {
        // 1. StringBuilder sb = new StringBuilder(str);
        // return sb.reverse().toString();
        
        // 2. return new StringBuilder(str).reverse().toString();
    }
    public static void main(String[] args) {
        String test = "I am Ironman.";
        StringBuilder sb = new StringBuilder(test);
        System.out.println(reverse(test));

    }
}