Java StringBuilder reverse() method is used to reverse a given character sequence.
Syntax of reverse() method:
sb.reverse(); //reverses the string represented by sb
Here, sb is an object of Java StringBuilder class.
reverse() Description
public StringBuilder reverse(): A StringBuilder instance represents a character sequence (a string). This method replaces the existing character sequence by reverse sequence.
reverse() Parameters
- This method does not take any parameter.
reverse() Return Value
- It returns a StringBuilder instance that contains the reverse of the given sequence.
Example 1: Reversing a String
public class JavaExample {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder("Tomato");
System.out.println("Given String: "+sb);
//reverse the String "Tomato"
sb.reverse();
//print reverse string
System.out.println("Reverse String: "+sb);
}
}
Output:
Example 2: Reversing user entered String
import java.util.Scanner;
public class JavaExample {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder("");
//take user input
System.out.print("Enter any String: ");
Scanner scan = new Scanner(System.in);
String str = scan.nextLine();
sb.append(str);
System.out.println("Entered String: "+sb);
//reverse the user entered string
sb.reverse();
//print reverse string
System.out.println("Reverse String: "+sb);
}
}
Output:
