Java 字符串反轉實現

package demo;

public class Test {
 
 public static String reverseString1(String s){
  
  String str = new StringBuffer(s).reverse().toString() ;
  return str ;
 }
 public static String reverseString2(String s){
  char[] c = s.toCharArray() ;
  String str = new String() ;
  for (int i = c.length-1; i>=0; i--) {
   str+=c[i] ;
  }
  return str ;
 }
 
 
 public static void main(String[] args) {
  String str="abc" ;
  //System.out.println(reverseString1(str));這是stringbuffer實現
  System.out.println(reverseString2(str));這是數組實現
  
 }

}