递归:

 public String stringReverse(String string) {
    if (string == null || string.length() == 0) {
        return string;
    }
    return stringReverse(string.substring(1)) + string.charAt(0);
 }

下面是一个使用递归的例子:

public void reverseString() {
    String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    String reverseAlphabet = reverse(alphabet, alphabet.length()-1);
}

String reverse(String stringToReverse, int index){
    if(index == 0){
        return stringToReverse.charAt(0) + "";
    }

    char letter = stringToReverse.charAt(index);
    return letter + reverse(stringToReverse, index-1);
}

StringBuilder s = new StringBuilder("racecar");
    for (int i = 0, j = s.length() - 1; i < (s.length()/2); i++, j--) {
        char temp = s.charAt(i);
        s.setCharAt(i, s.charAt(j));
        s.setCharAt(j, temp);
    }

    System.out.println(s.toString());

它会得到你输入的值，并反向返回;)

public static  String reverse (String a){
    char[] rarray = a.toCharArray();
    String finalvalue = "";
    for (int i = 0; i < rarray.length; i++)
    {
        finalvalue += rarray[rarray.length - 1 - i];
    }   
return finalvalue;

}

    public String reverse(String s) {

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

        return reversedString;
    }

System.out.print("Please enter your name: ");
String name = keyboard.nextLine();

String reverse = new StringBuffer(name).reverse().toString();
String rev = reverse.toLowerCase();
System.out.println(rev);

我使用这种方法将名称反向转换为小写。