The reverse() method of StringBuilder is used to reverse the characters in the StringBuilder. The method helps to this character sequence to be replaced by the reverse of the sequence. Syntax:
public java.lang.AbstractStringBuilder reverse()
Returns: This method returns StringBuilder object after reversing the characters. Below programs illustrate the java.lang.StringBuilder.reverse() method: Example 1:
Java
// Java program to demonstrate// the reverse() Method.class GFG { public static void main(String[] args) { // create a StringBuilder object // with a String pass as parameter StringBuilder str = new StringBuilder("WelcomeGeeks"); // print string System.out.println("String = " + str.toString()); // reverse the string StringBuilder reverseStr = str.reverse(); // print string System.out.println("Reverse String = " + reverseStr.toString()); }} |
Output:
String = WelcomeGeeks Reverse String = skeeGemocleW
Example 2:
Java
// Java program to demonstrate// the reverse() Method.class GFG { public static void main(String[] args) { // create a StringBuilder object // with a String pass as parameter StringBuilder str = new StringBuilder("AAAABBBCCCC"); // print string System.out.println("String = " + str.toString()); // reverse the string StringBuilder reverseStr = str.reverse(); // print string System.out.println("Reverse String = " + reverseStr.toString()); }} |
Output:
String = AAAABBBCCCC Reverse String = CCCCBBBAAAA
References: https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#reverse()
