How to Reverse String in Java using Various Methods?
- Using StringBuffer or StringBuilder
- Using charAt () method
- Using ArrayList object
- Using Reverse Iteration
- Using Recursion
How to reverse a string in JavaScript tutorial?
How to Reverse a String in JavaScript. To reverse a string, you can transform the string into an array and then use JavaScript arrays' built-in reverse () method. You can also use str.split ('').reverse ().join (''), but we recommend using Array.from () or the spread operator . The split () method does not handle UTF-16 characters, like emojis.
How do I return a string in Java?
- Parameters
- Returns
- Exception Throws. StringIndexOutOfBoundsException is thrown when any one of the following conditions is met. ...
- Internal implementation substring (int beginIndex)
- Internal implementation substring (int beginIndex, int endIndex) FileName: SubstringExample.java ... FileName: SubstringExample2.java ... ...
How to reverse a string in Java word by word?
Reverse a string in Java
- Objects of String are immutable.
- String class in Java does not have reverse () method, however StringBuilder class has built in reverse () method.
- StringBuilder class do not have toCharArray () method, while String class does have toCharArray () method.
How to reverse a string in JavaScript in one line?
Reverse a String With Built-In Functions
- The split () method splits a String object into an array of string by separating the string into sub strings.
- The reverse () method reverses an array in place. The first array element becomes the last and the last becomes the first.
- The join () method joins all elements of an array into a string.
See more
What are the different ways to reverse a string?
Reverse a String in Java in 10 different waysUsing StringBuilder/StringBuffer.Using Stack.Using Java Collections Framework reverse() method.Using character array.Using character array and swap()Using + (string concatenation) operator.Using Unicode Right-to-left override (RLO) character.Using a Byte Array.More items...
Which method is used to reverse a string in Java?
By using toCharArray() method is one approach to reverse a string in Java. The code also uses the length, which gives the total length of the string variable. The for loop iterates till the end of the string index zero.
What is Reverse () in Java?
StringBuffer reverse() Method in Java with Examples reverse() is an inbuilt method which is used to reverse the characters in the StringBuffer. The method causes this character sequence to be replaced by the reverse of the sequence. Syntax : public StringBuffer reverse()
How do you reverse a string without reverse?
You can reverse a String in several ways, without using the reverse() function. Using recursion − Recursion is the process of repeating items in a self-similar way....Outputconvert it into an array.Reverse the elements of the array.Create another String using the resultant array.
What do the replaceAll () do?
The replaceAll() method returns a new string with all matches of a pattern replaced by a replacement .
How do I reverse a word in a string in Java?
Java Program to reverse each word in Stringpublic class StringFormatter {public static String reverseWord(String str){String words[]=str.split("\\s");String reverseWord="";for(String w:words){StringBuilder sb=new StringBuilder(w);sb.reverse();reverseWord+=sb.toString()+" ";More items...
What is a string in Java?
A string is a character sequence that is an object in Java. There are several operations that can be performed on the String object in Java. One of the commonly used operations is String Reversal. A String that is reversed is said to be a Reverse String. For example, the ‘HAPPY’ string can be reversed as ’YPPAH’.
Can a string be reversed?
There are several ways in which a string can be reversed. For each of the methods, separate functions and loops will be used. Even though the methods are different, the underlying process behind the reversal of string almost similar, and it is mentioned below:
Introduction
This question is simple but important since it is asked in most of the java interviews. You will be asked to reverse a string using a ready to use library method (like reverse () of StringBuilder) or without using a library method. In this article, we will see both ways.
1. Using charAt () method of String
charAt () method of the Java String returns character value at the specified index of the string.
2. Using getBytes () method of String
In the getBytes () method of Java String first encodes the specified string into the sequence of bytes using the platforms default charset and then save the result in the byte array. The same byte array will be returned.
4. Using reverse () method of StringBuilder
reverse () method of the StringBuilder class replaces the character sequence represented by a string in the reverse order.
5. Using reverse () method of Collections
reverse () method of the Collections take list as a parameter and reverse the order of elements.
Conclusion
We can reverse the string in multiple ways. I have listed the five ways below.
Properties Of String in Java
Strings are immutable. Immutable simply is the word used to mean its unchangeable. Once a String objects are created, its value or state cannot be altered.
How To Reverse a String in Java
String object is immutable to make it mutable we will use StringBuilder class. StringBuilder has an inbuilt function known as reverse () that reverses the string. So, we’ll use this function to reverse the StringBuilder. Finally, transform the reversed StringBuilder into String by using the built-in method toString ().
Conclusion
In this post we saw Strings and its properties in java and also saw various methods on how to reverse a string in java.
1. Using build-in Methods to Reverse A String Java
In Java, programming language if we have a choice to use the built-in methods then we can directly use the reverse () method of the StringBuilder class to reverse a string.
Reverse String By Using Stack
We can also make use of stack data structure to reverse a string in Java or in any other programming language.
Solution Using In-Place Conversion
We can also solve this problem in linear time and constant space by using the in-place conversion. Below is the solution in linear time and constant space by using the stack data structure.
How to reverse a string in Java?
1. The user will input the string to be reversed. 2. First we will convert String to character array by using the built in java String class method toCharArray (). 3. Then , we will scan the string from end to start, and print the character one by one.
How to convert input string into character array?
1. Convert the input string into character array by using the toCharArray () built in method of the String Class . 2. In this method we will scan the character array from both sides , that is from the start index (left) as well as from last index (right) simultaneously. 3.
Does Java have a reverse method?
1. String class in java do not have reverse () method , StringBuilder class does have built in reverse () method. 2. StringBuilder class do not have toCharArray () method , while String class does have toCharArray () method. 1. The user will input the string to be reversed.
Built-in reverse () method
The StringBuffer class provides you a method named reverse (). It reverses the contents of the current StringBuffer object and returns the resultant StringBuffer object. It is the easiest way to reverse a Sting using Java. To do so −
Using recursion
Recursion is a process of calling a function within itself, following java program reverses a Sting using recursion −
Using toCharArray ()
You can also convert the String to a character array and swap the characters of the array.
