How To Contrary String Inward Coffee Amongst Or Without Stringbuffer Example

Reverse String inwards Java

There are many ways to contrary String inwards Java. You tin role rich Java API to speedily contrary contents of whatever String object. Java library provides StringBuffer as well as StringBuilder course of teaching alongside reverse() method which tin survive used to contrary String inwards Java. Since converting betwixt String as well as StringBuffer or StringBuilder is really slow it's the easiest means available to contrary String inwards Java. At the same time, Writing Java programme to contrary String inwards Java without StringBuffer is 1 of the pop Java String interview question, which requires you lot to contrary String past times applying logic as well as past times non using API methods.

Since contrary is a recursive job, you lot tin role recursion equally good equally a loop to contrary String inwards Java. In this Java tutorial, I lead maintain shown How to contrary String using StringBuffer, StringBuilder as well as using a pure loop alongside logic.

You tin likewise banking enterprise tally How to contrary String alongside recursion inwards Java if you lot desire to run across the recursive code. let's run across consummate Java programme for this beautiful Java programming exercise.

Algorithm

Here are the algorithm as well as code to contrary a given String inwards Java without using StringBuffer or whatever other API methods. The method below shows you lot how to contrary the String, which you lot tin farther reuse to banking enterprise tally if given String is Palindrome or not.

After initial input validation, nosotros are only iterating through String, starting from cease to start as well as generating a contrary String.

Java programme to Reverse String inwards Java

the master copy method, nosotros lead maintain outset used StringBuffer as well as StringBuilder to reverse contents of String as well as hence nosotros wrote our ain logic to contrary String.

This uses toCharArray() method of String course of teaching which render character array of String. By looping through grapheme array as well as appending it into empty String nosotros tin larn reversed String inwards Java, equally shown inwards the next example.

/**
 *
 * Java programme to contrary String inwards Java.
 * There are multiple ways to reverse
 * String inwards Java, you lot tin either lead maintain aid of measure
 * Java API StringBuffer to contrary String inwards Java.
 * StringBuffer has a reverse() method which returns StringBuffer
 * alongside reversed contents. 
 *
 * On the other hand, you lot tin likewise contrary it past times applying your
 * ain logic, if asked to contrary String without
 * using StringBuffer inwards Java. 
 *
 * By the means you lot tin likewise role StringBuilder to contrary
 * String inwards Java. StringBuilder is non-thread-safe
 * version of StringBuffer as well as provides similar API.
 * You tin role StringBuilder's reverse()
 * method to contrary content as well as hence convert it dorsum to String
 *
 * @author http://java67.blogspot.com
 */
public class StringReverseExample {
 
 
    public static void main(String args[]) {
     
        //quick wasy to contrary String inwards Java - Use StringBuffer
        String give-and-take = "HelloWorld";
        String contrary = new StringBuffer(word).reverse().toString();
        System.out.printf(" original String : %s ,
               reversed String %s  %n", word, reverse);
     
        //another quick to contrary String inwards Java - role StringBuilder
        give-and-take = "WakeUp";
        contrary = new StringBuilder(word).reverse().toString();
        System.out.printf(" original String : %s ,
             reversed String %s %n", word, reverse);
     
        // 1 means to contrary String without using
        // StringBuffer or StringBuilder is writing

        // ain utility method
        give-and-take = "Band";
        contrary = 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 contrary = "";
        for(int i = source.length() -1; i>=0; i--){
            contrary = contrary + source.charAt(i);
        }
     
        return reverse;
    }
   
}

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

That's all on How to contrary String inwards Java alongside as well as without StringBuffer as well as StringBuilder. Though beingness a Java programmer I prefer to role a library as well as propose anyone to role StringBuffer or StringBuilder to contrary String for whatever production use. Though its likewise a good programming exercise as well as you lot should exercise it earlier going for whatever Java programming interview.

Further Learning
The Coding Interview Bootcamp: Algorithms + Data Structures
Data Structures as well as Algorithms: Deep Dive Using Java
21 String Algorithm Questions for Java Programmers
10 Algorithm Books Every Programmer Should Read

Thanks for reading this article hence far. If you lot similar this String based coding Interview query hence delight portion alongside your friends as well as colleagues. If you lot lead maintain whatever incertitude or feedback hence delight drib a note.