Easy way to reverse String

Question

Without going through the char sequence is there any way to reverse String in Java

Answer 1

I have not seen any easy way. Here is the suitable way to do:

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Using the loop:

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    String d = "abcdefghij";
    char b[] = new char[d.length()];// new array;
    int j=0; // for the array indexing
    for(int i=d.length()-1;i>=0;i--){
        b[j] = d.charAt(i); // input the last value of d in first of b i.e. b[0] = d[n-1]
        j++;
    }
    System.out.println("The reverse string is: "+String.valueOf(b));

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Output is The reverse string is: jihgfedcba

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The simple logic is:

array[i] = array[n-i]; where i is the Iteration and n is the total length of array

Answer 2

Try this,

String s = "responses";
StringBuilder builder = new StringBuilder(s);
System.out.println(builder.reverse());

Answer 3

You can use the StringBuilder#reverse() method:

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

Answer 4

This is a way to do so using recursion -

public static String reverse(String s1){
        int l = s1.length();
        if (l>1)
                return(s1.substring(l-1) + reverse(s1.substring(0,l-1)));
        else
                return(s1.substring(0));
}

Answer 5

You can use String buffer to reverse a string.

public String reverse(String s) {
    return new StringBuffer(s).reverse().toString();
}

one more interesting way to do this is recursion.

public String reverse(String s) {
    if (s.length() <= 1) { 
        return s;
    }
    return reverse(s.substring(1, s.length())) + s.charAt(0);
}

Answer 6

public class RevString {
  public static void main(String[] args) {
    String s="jagan";
    String rev="";
    for (int i=s.length()-1;i>=0;i--) {
      rev=rev+s.charAt(i);
    }
     System.out.println("Reverse String is: "+rev);
  }
}