java字符串反转的7种方式

public class Test {
public static String reverse4(String s) {
 return new StringBuffer(s).reverse().toString();
}
public static void main(String[] args) {
        System.out.println(reverse1("瓜傻"));
System.out.println(reverse2("瓜傻"));
System.out.println(reverse3("瓜傻"));
System.out.println(reverse4("瓜傻"));
System.out.println(reverse5("瓜傻"));
System.out.println(reverse6("瓜傻"));
System.out.println(reverse7("瓜傻"));
}

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 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;
}
}