How to Reverse a String in Java Using Different Methods

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String Reverse in Java

In Java, a string is a group of characters that is regarded as an object. The String object has a wide range of actions available on it in Java. String Reverse is one of the most often used operations on a string object.Java’s String class lacks the reverse() function and is immutable. The Java reverse() method is integrated into the StringBuilder and StringBuffer classes, nevertheless. The reverse() method is used to reverse the order in which each character appears in a String, as its name implies. There are three main methods of reversing a string in Java.

1. Reverse a String using the CharAt method

To extract the characters from the supplied String, use the CharAt() function. The primary function of the CharAt() method is to return the character that is located at the given String’s specified index. One of the straightforward methods in Java for reversing a String is this one.

2. Reverse a String using the String builder

Reversing the characters in a StringBuffer is done using the built-in method reverse() of the StringBuffer and StringBuilder classes. By using this technique, the original character sequence is replaced.

3. Reversing string using reverse iteration

In this method, the given String was first transformed to a Character Array using the CharArray() method. Simply iterate the provided array in reverse order after that.

4. With the use of toCharArray ()

The code that follows will explain how to reverse a string. Java has a method called toCharArray() that can be used to reverse a string. The length keyword is also used in the code, and it returns the overall length of the string variable. The for loop continues until the string index zero ends.

5. Using the While Loop or the For Loop

The while loop or the for loop should only be used to handle the string. With the use of a cursor movement or by iterating through the string’s index, determine the length of the string to end the loop. The loop outputs the string character where the index is (i-1). The loop begins, iterates through the entire length of the string, and ends at index 0.

6. Making a String into Bytes

The given string will be divided or turned into bytes using the getBytes() method. The length of the temporary byte array will match the length of the supplied string. Reverse the order of the bytes and place them in another byte array.

7.ArrayList Objects Are Used

Convert the input string into a character array using the built-in function toCharArray(). Add the characters from the array to the ArrayList object after that. A built-in reverse() function is also available in the Java Collections class. Use the ArrayList object, which is a list of characters, to reverse the list since the reverse() method of the Collections class requires a list object.

8. Using Stack

These steps can be used to reverse a Java string using the Stack data structure:

• Make a stack with no characters in it.
• Use the String.toCharArray() method to turn a specified string into a character array, then push each character onto the stack.
• Once the stack is empty, remove characters, then add them to another character array. Reversed character order will be used for entry.
• Then, using String.copyValueOf(char[]), create a string from the character array and return it.

9. Utilizing Recursion

Learn how to use the stack data structure to reverse a Java string in this article. Since the stack is involved, we can easily adapt the code by using the recursive call stack. Since a string cannot be changed, we must first turn it into a character array. After accomplishing this, we invert the character array and finish by turning it back into a string.

10. Using the swap() Method and the Character Array

Here is a useful method for reversing a Java string using character arrays.

• To begin, use String.toCharArray to construct your character array and initialize it with the characters from the given string ().
• Run the loop until it intersects the two endpoints “1” and “h,” starting from each of them. Swap the values that are present at the indexes “l” and “h” for each iteration of the loop. Add a “l” and subtract a “h.”
• Finish up by using String.copyValueOf(char[]) to change your character array into a string before returning.

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Reverse Function in Java

The characters in the StringBuffer can be reversed using the built-in method Java. lang.StringBuffer.reverse(). The technique causes the opposite character sequence to be used in place of this one. the employed syntax is public StringBuffer reverse(). Let us take the input as Join Entri and the output will be irtnE nioJ.

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Conclusion

Java string objects are inherently immutable, however, there are a variety of manipulation techniques we can use. We examined the various Java methods for reversing strings. We may accomplish this by either creating some logic to perform the string reversal or by using built-in functions like reverse(). The String class also includes several well-known string functions that can be used to convert, compare, and trim strings, among other things.

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