Daily Java Challenge #1 – Reverse a String in Java (Beginner Level)

Problem statement:

Write a java program to reverse a string entered by the user.

Input:

A string, for example “hello”

Output:

The reversed string “olleh”

Explanation (Very simple language):

Image you’re reading a word backward, like reading from the last letter to the first letter. So instead of:

h->e->l->l->o

We go:

o->l->l->e->h

That’s what reversing a string means — flipping it.

import java.util.Scanner;

public class ReverseString {
    public static void main(String[] args) {
        // Step 1: Ask the user to enter a word
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a word: ");
        String input = scanner.nextLine();

        // Step 2: Create a new string to store the reversed word
        String reversed = "";

        // Step 3: Loop from last letter to the first
        for (int i = input.length() - 1; i >= 0; i--) {
            reversed = reversed + input.charAt(i); // Add each letter one by one
        }

        // Step 4: Print the result
        System.out.println("Reversed word is: " + reversed);
    }
}

Step-by-Step

• We use scanner to take input from the user.
• We create an empty string reversed to keep our flipped word.
• We run a loop from the last letter to the first, using charAt(i) to get each letter.
• We add each letter to the reversed string.
• We show the final reversed word.

Example:

If the user types: “apple”

The output will be: “elppa”

Challange For You (Try this):

Can you reverse the string without using a loop? Hint: Check out StringBuilder in Java.