문제풀이 21번

문자열 뒤집기

package _2;
import java.util.*;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Scanner sc = new Scanner(System.in);
	    String string =sc.next();
	    String st = "";
		for(int i=0 ; i<string.length(); i++) st+=string.charAt(string.length()-1-i);
		
		System.out.print(st);
				
			
			
		
		 
	}
}

reverse 메소드 이용

package _2;
import java.util.*;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Scanner sc = new Scanner(System.in);
	    String string =sc.next();
		System.out.print(reverseStr(string));
				
	}
	public static String reverseStr(String s) {
	    return (new StringBuffer(s)).reverse().toString();
	  }
}