public static String reverseIt(String source) {
    int i, len = source.length();
    StringBuilder dest = new StringBuilder(len);

    for (i = (len - 1); i >= 0; i--){
        dest.append(source.charAt(i));
    }

    return dest.toString();
}

http://www.java2s.com/Code/Java/Language-Basics/ReverseStringTest.htm

java中的简单For循环

 public void reverseString(char[] s) {
    int length = s.length;
    for (int i = 0; i < s.length / 2; i++) {
        // swaping character
        char temp = s[length - i - 1];
        s[length - i - 1] = s[i];
        s[i] = temp;
    }
}

由于下面的方法(使用XOR)反转字符串没有列出，我附加这个方法来反转字符串。

该算法基于:

1.(a xor b) xor b = a 2.(a xor b) xor a = b

代码片段:

public class ReverseUsingXOR {
    public static void main(String[] args) {
        String str = "prateek";
        reverseUsingXOR(str.toCharArray());
    }   

    /*Example:
     * str= prateek;
     * str[low]=p;
     * str[high]=k;
     * str[low]=p^k;
     * str[high]=(p^k)^k =p;
     * str[low]=(p^k)^p=k;
     * 
     * */
    public static void reverseUsingXOR(char[] str) {
        int low = 0;
        int high = str.length - 1;

        while (low < high) {
            str[low] = (char) (str[low] ^ str[high]);
            str[high] = (char) (str[low] ^ str[high]);   
            str[low] = (char) (str[low] ^ str[high]);
            low++;
            high--;
        }

        //display reversed string
        for (int i = 0; i < str.length; i++) {
            System.out.print(str[i]);
        }
    }

}

输出:

keetarp

过程:

我们可以使用split()来拆分字符串。然后使用反向循环并添加字符。

代码片段:

class test
{
  public static void main(String args[]) 
  {
      String str = "world";
      String[] split= str.split("");

      String revers = "";
      for (int i = split.length-1; i>=0; i--)
      {
        revers += split[i];
      }
      System.out.printf("%s", revers);
   }  
}

 //output : dlrow

public class Test {

public static void main(String args[]) {
   StringBuffer buffer = new StringBuffer("Game Plan");
   buffer.reverse();
   System.out.println(buffer);
 }  
}

    public String reverse(String s) {

        String reversedString = "";
        for(int i=s.length(); i>0; i--) {
            reversedString += s.charAt(i-1);
        }   

        return reversedString;
    }