Reverse string in java

StringReverseExample.java

/**
 *
 * Java program to reverse String in Java. There are multiple ways to reverse
 * String in Java, you can either take help of standard Java API StringBuffer
 * to reverse String in Java. StringBuffer has a reverse() method which return StringBuffer
 * with reversed contents. On the other hand you can also reverse it by applying your
 * own logic, if asked to reverse String without using StringBuffer in Java. By the way
 * you can also use StringBuilder to reverse String in Java. StringBuilder is non thread-safe
 * version of StringBuffer and provides similar API. You can use StringBuilder's reverse()
 * method to reverse content and then convert it back to String
 *
 * @author http://java67.blogspot.com
 */
public class StringReverseExample {
  
  
    public static void main(String args[]) {
      
        //quick wasy to reverse String in Java - Use StringBuffer
        String word = "HelloWorld";
        String reverse = new StringBuffer(word).reverse().toString();
        System.out.printf(" original String : %s , reversed String %s  %n", word, reverse);
      
        //another quick to reverse String in Java - use StringBuilder
        word = "WakeUp";
        reverse = new StringBuilder(word).reverse().toString();
        System.out.printf(" original String : %s , reversed String %s %n", word, reverse);
      
        //one way to reverse String without using StringBuffer or StringBuilder is writing
        //own utility method
        word = "Band";
        reverse = reverse(word);
        System.out.printf(" original String : %s , reversed String %s %n", word, reverse);
    }   
  
  
    public static String reverse(String source){
        if(source == null || source.isEmpty()){
            return source;
        }       
        String reverse = "";
        for(int i = source.length() -1; i>=0; i--){
            reverse = reverse + source.charAt(i);
        }
      
        return reverse;
    }
    
}

Output:
original String : HelloWorld , reversed String dlroWolleH 
original String : WakeUp , reversed String pUekaW
original String : Band , reversed String dnaB