In this article we’ll see a Java program to get all the files having a specific extension from a directory. FileNameFilter Interface in Java In FilenameFilter interface there is method accept(). accept(File dir, String name)– Tests if a specified file should be included in a file list. By implementing this…
In this post we’ll see a Java program to reverse a String in-place. If we go by the definition of an in-place algorithm it doesn’t use any extra space the space of the input data itself is used to modify the data and produce the output. Now we do know…
In this post we’ll see how to reverse an array in-place Java. Though it is easy to take another array and start storing elements from the last index to the first index of the original array to this new array in order to get reversed array but this approach means…
An in-place algorithm is an algorithm that doesn’t use any extra space to transform the input. It uses the same space used by input data and modify the data with in that space itself to produce the output. However a small amount of extra storage space is allowed for auxiliary…
While reading about different sorting algorithms you would have come across the terms stable sorting algorithms and unstable sorting algorithms. In this post we’ll see what is the difference between stable and unstable sorting algorithms. Stable sorting algorithm A sorting algorithm is said to be stable if the order of…
This post shows ways to find first non repeated character in the given String in Java. For example if the given String is “abcdcab” then the first non repeated character is d. There are many options to write a Java program to find first non repeated character in the given…
In this post we’ll see a Java program to check if the given strings are anagram or not. Two strings are called anagrams if you can get the second string by rearranging all of the letters in the other string. As example– Keep and Peek, Dormitory and Dirty room, Listen…
In this post we’ll see a Java program to find the longest palindrome in the given string. In the given string there may be more than one palindromes but you need to find which one is the longest and display that one. For finding the longest palindrome in the string…
String Java Program to Count The Frequency of Each Character in a String Java Program to Count Number of Words in a String Java Program to Find Duplicate Characters in a String With Repetition Count Java Program to Check Given String Palindrome or Not Java Program to Find Longest Palindrome…
In this post we’ll see how to reverse a number in Java. The Java program to reverse a number can be written in both iterative as well as recursive way. Both solutions are given here. Logic for both of the method is similar; you need to do a modulo division…
