Java Programs on String are commonly asked interview questions. In this article, we will discuss – how to reverse a String in Java without using an in-built function.

Step 1: First, we will convert the String to a char[] array using String function – toCharArray() and store it in variable arr

Step 2: Initialized an empty string i.e. null

Step 3: Write a for loop which adds each character in reverse order – reverse = reverse + arr[i];

Example – Code Snippet:

package TestAutomationCentral;

public class ReverseString {
    public static void main(String[] args) {
        //TestAutomationCentral.com
        String str = "Test Automation Central";
        char[] arr = str.toCharArray();
        String reverse = "";
        for (int i = arr.length - 1; i >= 0; i--) {
            reverse = reverse + arr[i];
        }

        System.out.println(reverse);
    }
}