Quick Answer: How To Reverse A String In Java?

How do you reverse a string in Java?

How to reverse String in Java

  1. public class StringFormatter {
  2. public static String reverseString( String str){
  3. StringBuilder sb=new StringBuilder(str);
  4. sb. reverse ();
  5. return sb.toString();
  6. }
  7. }

How do you reverse a string?

Method 1: Reverse a string by swapping the characters

  1. Input the string from the user.
  2. Find the length of the string. The actual length of the string is one less than the number of characters in the string.
  3. Repeat the below steps from i = 0 to the entire length of the string.
  4. rev[i] = str[j]
  5. Print the reversed string.

How do I reverse a string in Java using charAt?

1. Using charAt () method of String

  1. Declare a string that you have to reverse.
  2. Initialize an empty string with the name reversedString.
  3. Apply for loop to get the characters of the blogName in the reverse order i.e int i = blogName.length()-1; i <= 0; i- -;

Why the string is immutable?

The string is Immutable in Java because String objects are cached in the String pool. Mutable String would produce two different hashcodes at the time of insertion and retrieval if contents of String was modified after insertion, potentially losing the value object in the map.

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Can we convert StringBuffer to string?

The toString() method of StringBuffer class can be used to convert StringBuffer content to a String. This method returns a String object that represents the contents of StringBuffer. As you can observe that the string object represents the same sequence that we had in StringBuffer.

Which function is used to reverse the string?

To reverse a string, we use the function Is strrev().

How do you reverse a string without reverse function?

Example to reverse string in Java by using static method

  1. import java.util.Scanner;
  2. public class ReverseStringExample3.
  3. {
  4. public static void main( String [] arg)
  5. {
  6. ReverseStringExample3 rev=new ReverseStringExample3();
  7. Scanner sc=new Scanner(System.in);
  8. System.out.print(“Enter a string: “);

How do you reverse a string in a for loop?

Reverse The String Using FOR Loop in C

  1. // Reverse the String using FOR Loop.
  2. #include <stdio.h>
  3. #include < string.h>
  4. int main(void)
  5. {char *str=”ForgetCode”;
  6. printf(” Reverse the String:”);
  7. for(int i=(strlen(str)-1);i>=0;i–)
  8. { printf(“%c”,str[i]);

Can we convert StringBuilder to string in Java?

To convert a StringBuilder to String value simple invoke the toString() method on it. Instantiate the StringBuilder class. Append data to it using the append() method. Convert the StringBuilder to string using the toString() method.

How do you remove duplicate characters from a string in Java?

We should have to use the following steps for removing duplicates.

  1. In the first step, we have to convert the string into a character array.
  2. Calculate the size of the array.
  3. Call removeDuplicates() method by passing the character array and the length.
  4. Traverse all the characters present in the character array.

How do you reverse a number?

Where reverse is a variable representing the reverse of number.

  1. Step 1 — Isolate the last digit in number. lastDigit = number % 10.
  2. Step 2 — Append lastDigit to reverse. reverse = ( reverse * 10) + lastDigit.
  3. Step 3-Remove last digit from number. number = number / 10.
  4. Iterate this process. while ( number > 0)
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Why is String final in Java?

The String is immutable in Java because of the security, synchronization and concurrency, caching, and class loading. The reason of making string final is to destroy the immutability and to not allow others to extend it. The String objects are cached in the String pool, and it makes the String immutable.

What is difference between string and StringBuffer?

In Java programming language, strings are treated as objects. The Java platform provides the String class to create and manipulate strings. Whereas, StringBuffer class is a thread-safe, mutable sequence of characters. A string buffer is like a String, but can be modified.

What is the difference between string buffer and string builder?

String buffer and StringBuilder both are mutable classes which can be used to do operation on string objects such as reverse of string, concating string and etc. We can modify string without creating a new object of the string. A string buffer is thread-safe whereas string builder is not thread-safe.

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