Reverse a String using StringBuilder and StringBuffer in Java

This post will discuss how to reverse a string using StringBuilder and StringBuffer in Java.

The following example demonstrates how to use the StringBuilder.reverse() method to reverse a string in Java efficiently.

class Main

{

// Method to reverse a string in Java using `StringBuilder`

public static String reverse(String str) {

return new StringBuilder(str).reverse().toString();

}

public static void main(String[] args)

{

String str = "Techie Delight";

// Note that string is immutable in Java

str = reverse(str);

System.out.println("The reversed string is " + str);

}

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Output:

The reversed string is thgileD eihceT

Alternatively, we can also use the StringBuffer.reverse() method. Using StringBuilder is suggested as it’s not synchronized and faster than StringBuffer.

class Main

{

// Method to reverse a string in Java using `StringBuffer`