java基础 7种反转方法 charAt()等方法

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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; }  }

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