Java reference

StringBuilder.reverse()

Reverses the contents of a StringBuilder.

Available since: Java 5

Syntax

public StringBuilder reverse()

Return value

StringBuilderThe same StringBuilder, now reversed.

Examples

Reversing a string:

void main() {
    String reversed = new StringBuilder("Java").reverse().toString();
    IO.println(reversed);
}

Output:

avaJ

A palindrome check:

void main() {
    String word = "level";
    boolean palindrome = new StringBuilder(word).reverse().toString().equals(word);
    IO.println(palindrome);
}

Output:

true

Notes

The method changes the object itself rather than creating a new one. Surrogate pairs (emoji) are reversed correctly, as single characters. String has no reverse() method of its own.

Related recipes

In the tutorial

StringBuilder — StringBuilder in Java: a mutable string, append, insert, reverse, deleteCharAt, call chains and building a string in a loop.

Thanks for reading!