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Reverse a String

Java Easy 7 views
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Ever wanted to flip a word or sentence completely backwards just to see its hidden mirror image? That’s the classic challenge of Reverse a String! Your mission is to write a function that takes any text and returns a brand-new string with all the characters in exact reverse order. The last letter becomes the first, and the first becomes the last!

The "secret sauce" here is understanding String Immutability. In many languages like Java, strings cannot be changed after they’re created. This means you can't simply swap characters "in-place." Instead, you’ll need to build a new sequence—perhaps by iterating backwards from the end of the text and appending each character one by one to a StringBuilder. It’s a fundamental test of your ability to manipulate sequences and manage memory efficiently.

Mastering string reversal is a rite of passage for every developer. It’s the gold standard exercise for understanding how characters and strings are stored and accessed in memory correctly!

Algorithm Flow

Recommendation Algorithm Flow for Reverse a String - Budibadu
Recommendation Algorithm Flow for Reverse a String - Budibadu

Best Answers

java - Approach 1
public class Solution {
    public String reverseString(String text) {
        if (text == null) return null;
        return new StringBuilder(text).reverse().toString();
    }
}