How can I get a char array in reverse order?

Question

my assignment question is like that

Write a program which prints the letters in a char array in reverse order using

void printReverse(char         


        

Answer 1

public void printReverse(char[] word){

reverseWordMaxIndex = word.length -1;

char[] reverseWord = new char(reverseWordMaxIndex + 1)

for ( int i= 0; i < word.length; i++){

reverseWord[reverseWordMaxIndex-i] = word[i];

}

for( int i= 0; i < reverseWord.length; i++){
  System.out.println(reverseWord[i]);
   }

}

Answer 2

This is a class which reveres the character array using recursion.

public class ReverseString {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        String str = new String("Hello");
        char[] strcharArray = str.toCharArray();
        printReverse(strcharArray);

    }

    private static void printReverse(char [] str) {
          helper(0, str);
        }
        private static void helper(int index, char [] str) {
          if (str == null || index >= str.length) {
            return;
          }
          helper(index + 1, str);
          System.out.println(str[index]);
        }
}

Answer 3

You can make use of StringBuilder#reverse() method like this:

String reverse = new StringBuilder(new String(letters)).reverse().toString();

Answer 4

This should take about 6 ms. It reverses a char array "in-place" before printing.

public static void reverseString(char[] s) {
    int len = s.length;

    if (len == 0)
        return;

    for (int i=0; i < (len/2); i++)
    {
        char l = s[i];
        s[i] = s[len-i-1];
        s[len-i-1] = l;
    }

    System.out.println(s);
}