import java.util.Stack; public class StringReverse { public static String reverse1(String s) {    int length = s.length();    if (length <= 1)     return s;    String left = s.substring(0, length / 2);    String right = s.substring(length / 2, length);    return reverse1(right) + reverse1(left);  }  public static String reverse2(String s) {    int length = s.length();    String reverse = "";    for (int i = 0; i < length; i++)     reverse = s.charAt(i) + reverse;    return reverse;   }   public static String reverse3(String s) {    char[] array = s.toCharArray();    String reverse = "";    for (int i = array.length - 1; i >= 0; i--)     reverse += array[i];    return reverse;   }   public static String reverse4(String s) {    return new StringBuffer(s).reverse().toString();   }   public static String reverse5(String orig) {    char[] s = orig.toCharArray();    int n = s.length - 1;    int halfLength = n / 2;    for (int i = 0; i <= halfLength; i++) {     char temp = s[i];     s[i] = s[n - i];     s[n - i] = temp;    }    return new String(s);   }   public static String reverse6(String s) {    char[] str = s.toCharArray();    int begin = 0;    int end = s.length() - 1;    while (begin < end) {     str[begin] = (char) (str[begin] ^ str[end]);     str[end] = (char) (str[begin] ^ str[end]);     str[begin] = (char) (str[end] ^ str[begin]);     begin++;     end--;    }    return new String(str);   }   public static String reverse7(String s) {    char[] str = s.toCharArray();    Stack<Character> stack = new Stack<Character>();    for (int i = 0; i < str.length; i++)     stack.push(str[i]);    String reversed = "";    for (int i = 0; i < str.length; i++)     reversed += stack.pop();    return reversed;   }  }