How to reverse a String in Java?

Question

Aryan Kumar · Answer

In Java, you can reverse a string by converting it into a StringBuilder object, then using the
reverse() method to reverse the characters in the string. Here's an example code snippet that demonstrates how to reverse a string in Java:
public class ReverseString {
   public static void main(String[] args) {
       String originalString = "hello world";
       StringBuilder reversedString = new StringBuilder(originalString).reverse();
       System.out.println("Original string: " + originalString);
       System.out.println("Reversed string: " + reversedString);
   }
}
In this example, we first create a string called originalString that we want to reverse. We then create a
StringBuilder object and pass the original string as a parameter to the constructor.
Next, we call the reverse() method on the StringBuilder object to reverse the characters in the string. The reversed string is then stored in the
reversedString variable.
Finally, we print out both the original string and the reversed string using the
println() method.
and

Krishnapriya Rajeev · Answer

The code given below demonstrates how to reverse a string.
class reverse
{
    public static void main(String args[])
    {
        String word = "Welcome to MindStick Forum.";	// Declare and initialise a string
        int n = word.length();	// Store length of the string
        String rev = "";
        for(int i = n-1; i >= 0; i--)
        {
            rev += word.charAt(i);	// Stores the array in reverse order
        }
        System.out.println("The reverse is " + rev);
    }
}
OUTPUT:
The reverse is .muroF kcitSdniM ot emocleW

Mukul Goenka · Answer

import java.util.Scanner;
public class HelloWorld {
and public static void main(String[] args) {
and  and  Scanner sc = new Scanner(System.in);
and  and  System.out.println('Enter any string for reverse: ');
and  String str = sc.nextLine();
and  System.out.println(reverse(str));
and }
and public static String reverse(String in) {
and  if (in == null)
and  and throw new IllegalArgumentException('Null is not valid input');
and  StringBuilder out = new StringBuilder();
and  char[] chars = in.toCharArray();
and  for (int i = chars.length - 1; i >= 0; i--)
and  and out.append(chars[i]);
and  return out.toString();
and }
}
Output.
Enter any string for reverse: Here are mindstick software pvt ltd.
.dtl tvp erawtfos kcitsdnim era ereH

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How to reverse a String in Java?

Mukul Goenka

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