Table of Contents1. Using String Library Methods2. Using Recursion3. Using Hashing ConceptUsing ArraysUsing Collections (Map) 4. Using Java 8 Features In this article, we will look at a problem: Given an Input String and a Character, we have to Count Occurrences Of character in String in java. For Example, If the Given String is : […]

Table of ContentsAlgorithmUsing while loopUsing log() and pow() methodsUsing while loop and pow() method In this article, we are going to find first and last digit of a number in Java. To find first and last digit of any number, we can have several ways like using modulo operator or pow() and log() methods of […]

Table of ContentsWhat is a Happy Number?Using HashsetAlgorithmExampleUsing slow and fast pointersAlgorithmExample In this article, we are going to learn to find Happy Number using Java. Let’s first understand, what is Happy Number? What is a Happy Number? A number which leaves 1 as a result after a sequence of steps and in each step […]

Table of ContentsIterative approachRecursive approach In this article, we are going to find whether a number is perfect or not using Java. A number is called a perfect number if the sum of its divisors is equal to the number. The sum of divisors excludes the number. There may be several approaches to find the […]

Table of ContentsWhat is a Magic Number?Algorithm for Magic NumberExample to find Magic NumberAnother Example To find Magic Number In this article, we are going to learn to find Magic Number using Java. Let’s first understand, what is Magic Number? What is a Magic Number? A number which leaves 1 as a result after a […]