String is palindrome or not in java

String is palindrome or not in java

Palindrome number in java: A palindrome number is a number that is same after reverse. For example,are the palindrome numbers. Let's see the palindrome program in java.

In this java program, we will get a number variable and check whether number is palindrome or not. You can also use a method where number or string is not predefined. JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. Java Training Java Tutorial.

Write a Java Program to Check String is palindrome or not using String Buffer

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string is palindrome or not in java

Selenium Py. Verbal A. Angular 7. Compiler D. Software E. Web Tech. Cyber Sec. Control S. Data Mining. Javatpoint Services JavaTpoint offers too many high quality services.Learn to check if a given string is palindrome string with simple java programs using stack, queue or simple loops. A palindrome is a word, phrase, number, or other sequence of units that may be read the same way in either direction, generally if used comma, separators or other word dividers are ignored.

To check palindrome, we can pick the characters one by one from start and end of string and start comparing to each other. Rather than comparing chars from start and end, we can also find the reverse string of the given string and compare both strings.

If both strings are same, they are palindrome.

Java Program to Check String is a Palindrome or Not (Revisited)

Then we compare both strings. This is simplest approach which simply iterated the char array backwards and creates the string by appending chars to produce reverse string. Drop me your questions related to check whether the given string is a palindrome or not in java. A family guy with fun loving nature. Love computers, programming and solving everyday problems.

Find me on Facebook and Twitter. Why not call String. May be your are referring to StringBuilder.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

A palindrome is a word, phrase, number or other sequence of units that can be read the same way in either direction.

To check whether a word is a palindrome I get the char array of the word and compare the chars. I tested it and it seems to work. However I want to know if it is right or if there is something to improve.

First loop iteration we will compare word[0] and word[4]. They're equal, so we increment i1 it's now 1 and decrement i2 it's now 3. So we then compare the n's. They're equal, so we increment i1 it's now 2 and decrement i2 it's 2. Now i1 and i2 are equal they're both 2so the condition for the while loop is no longer true so the loop terminates and we return true. EDIT: FernandoPelliccioni provided a very thorough analysis of the efficiency or lack thereof of this solution, both in terms of time and space.

If you're interested in the computational complexity of this and other possible solutions to this question, please read it! For anybody who is looking for a shorter recursive solution, to check if a given string satisfies as a palindrome:. And here a complete Java 8 streaming solution. An IntStream provides all indexes til strings half length and then a comparision from the start and from the end is done. I worked on a solution for a question that was marked as duplicate of this one.

Might as well throw it here Checking palindrome for first half of the string with the rest, this case assumes removal of any white spaces. Here my analysis of the Greg answer: componentsprogramming.

Sidenote: But, for me it is important to do it in a Generic way. The requirements are that the sequence is bidirectionally iterable and the elements of the sequence are comparables using equality. Recently I wrote a palindrome program which doesn't use StringBuilder. A late answer but this might come in handy to some people. Iterative : This has be proven as a good solution. I think this solution shouldn't be much worse than the iterative one.

Is a little bit crapy we need to extract the cleaning step out of the method to avoid unnecesary procesing. Reversing : This has been proved as a expensive solution. Learn more.

Check string for palindrome Ask Question. Asked 9 years, 5 months ago. Active 2 months ago. Viewed k times. Upvote Upvote Active Oldest Votes. I too felt that way. Would be great if OP has a different explanation.In this program, it is very easy to check the given string is Palindrome or not. In this program ,First convert the String to StringBuffer. I am reversing the string using reverse method in String Buffer Class and then comparing the reversed string with original string using compareTo method in string.

The following code accepts a string, and checks whether the given string is Palindrome or not using String Buffer. The Program below is successfully compiled and run on the Windows System to produce desired output.

I wrote a program for the palindrome without declaring a string in the beginning. I took both the strings as StringBuffer and reversed one of them using the reverse method. Why am I still not getting the right answer? Not Palindrome: :.

string is palindrome or not in java

Scanner. Enter string which u want to check : madam Given String is : madam Reverse String is : madam madam is Palindrome. Enter string which u want to check : madam. Given String is : madam. Reverse String is : madam.

Like this:.

string is palindrome or not in java

Leave a Reply Cancel reply.When people interview for Javathey are normally tested for their logic and programming skills. One of the most frequently asked questions is Palindrome program in Java. Palindrome is nothing but any number or a string which remains unaltered when reversed. For example: or MAAM. It is evident that letters form mirror images on reversal.

Explanation : Input the number you want to check and store it in a temporary temp variable. Now reverse the number and compare whether the temp number is same as the reversed number or not. If both the numbers are same, it will print palindrome number, else not a palindrome number. Note: The logic of the Palindrome program remains the same, but the execution differs. In this section, we will find palindrome of a Java string.

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Palindrome in Java

What is the role for a ClassLoader in Java?This post is part of the series JavaScript Puzzles. I will provide multiple solutions for a program so that you can have a better understanding of the problem and solution. If you are preparing for competitive programming, then you have landed in a right place because I will persistently make more and more articles regarding algorithms and puzzles in JavaScript.

I am very excited. So, let's get started…. Note : I will follow the shortest syntax in solving these problems, you should be familiar with the ES6 syntax. Write a program to check whether a string is a palindrome or not. Like — 'madam', 'radar', 'lol' etc. First of all, Try to solve this problem on your own. Always remember — You can only learn to code by doing it.

string is palindrome or not in java

There can be many solutions for this program. Let's have a look on solutions which I found. This might seem complicated but it's not, this is the most efficient solution of it.

If both of them are equal, we will compare second and second-last characters. If we will keep getting same character, we will keep iterating till the middle of the loop. We don't require to iterate through entire loop. We will break the loop, if we don't find the match and set isPalindrome to false. Now lets have a look at other solutions. Solution 2 to 6 uses the same principle i. If a given string and its reverse string are same, then given string is a palindromic string.Great article.

We use two pointers moving from the front and back of the String respectively. Once a mismatched char is found, we can safely say that the String is not a palindrome. Hey dear Paul nice article : I would like to explain me this line : return reverse str.

Hello Hybrid Static, here we are extracting the first character and passing rest of the String to method itself the recursive call. After that we are adding that first character at then end of what reverse return. So if your string is "abcd" then str. When recursion will complete and things will start rolling back e.

Suan, that's indeed a good solution without using recursion. Best part of this is that it doesn't need to reverse the whole string to check if given String is palindrome, as soon as you find one mismatched character you can say that its not palindrome. Great solution. CheckPalindrome method will not work. You have given new StringBuilder text ; and later appending the reverse of the string to the same stringbuilder sb. So if my string is the reversed string as per your prog will be How is it working for you?

Here is solution in a simple way without using loop. We are checking only first and last index. It looks like your code fragment would only check the first and last chacters. Anthony, There is no need to check the whole string using loop if first and last character of the string is same then your string is palindromee.

Here is another logic but this has more time and space complexity. That makes much more sense in the second version, since you are checking the reverse of the string equalling the original string. Or if you just compared the nth char with the length-1 th char. Unless you just missed something in your first example. A palindrome is a word that reads the same forwards as it does backwards. Post a Comment. Recursion and Loop. A String is said to be Palindrome if it is equal to itself in reverse order.

You can use this logic to check if String is Palindrome or not. There are two common ways to find if a given String is Palindrome or not in Java, first by using for loop, also known as iterative algorithm and second by using recursion, also known as recursive algorithm. The crux of this problem lies in how do you reverse String in Java?

If both are equal then given String is Palindrome otherwise it's not. Also whether your solution is iterative or recursive will also determine by implementing this logic. If you reverse String using for loop then it become an iterative solution and if you reverse String using recursion then it become a recursive solution.

In general, recursive solution are short, readable and more intuitive but subject to StackOverFlowError and that's why not advised to be used in production system. You should always be using iterative solution in production, unless your programming language supports tail recursion optimization e.

Scala which eliminates risk of StackOverFlowError by internally converting a recursive solution to an iterative one.


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