Find Intersection of Two Arrays – Java Code

Given two sorted arrays, Write a java code to find intersection of two arrays.

For example, if the input arrays are:

arr1[] = {2, 3, 6, 7, 9, 11}
arr2[] = {4, 6, 8, 9, 12}

Then your program should print intersection as {6, 9}. Before writing actual code, let’s first discuss different approaches to solve this problem.

Move All Zeroes to the End of Array – Java Code

In this tutorial, We are going to discuss another interesting problem to move all zeroes to end of array. Given an array of random integers move all zeroes of a given array to then end of an array. The order of all other elements of an array should be same.

For example, if a given array is {1, 2, 0, 4, 0, 5, 3, 8}, than the output should be {1, 2, 4, 5, 3, 8, 0, 0}.

Find Next Greater Element in an Array – Java Code

Write a java program to find next greater element in an array. Given an input array, find the next greater element for every element of an array.The next greater element x is the first greater element on the right side of x in an array.

For example:

Let’s take an array: [4, 2, 6, 8, 1]

4 => 6 (First next greater element of 4 is 6)
2 => 6 (Next greater element of 2 is 6)
6 => 8 (Next greater element of 6 is 8)
8 => null
1 => null

Java Program to Find Missing Number in Array

Write a java program to find missing number in array. Given an array of n-1 integers and these integers are in the range of 1 to n. One of the integer is missing from an array. We have to write an efficient java code to find missing number from an array. An array does not contains any duplicates.

PHP Composer : Manage Package Dependency in PHP

What’s a PHP composer? How to use PHP composer in your PHP Application? What are the benefits of using composer in your application?

PHP Composer is a dependency manager. It manages the dependency of PHP packages in your application. Using composer you can pull the required library and dependencies and manage them in one place. The concept of a composer is similar to npm in node.js and gem in Ruby.

Let’s first understand what is a dependency.

Magic Methods in PHP

What are PHP Magic Methods?

PHP Magic methods are a specialized method that is executed in response to a specific event. Each magic methods start with two underscores(__) and it is called automatically when a certain condition is met. It triggers custom behaviors defined by a programmer inside the class. Some of the magic methods are __construct(), __destruct(),  __toString(),  __get(),  __set(), __call() etc.

In this tutorial, we are going to explore these magic methods.

PHP Magic Methods

PHP Magic Methods