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In this problem statement, our task is to write a JavaScript program by which we can simply filter an associative array with the help of another array. Before discussing the solution for the given problem, let's familiarize ourselves with associative array first. What is an associative array? An associative array is a data structure which is used to store the key and value pairs. In this each key is associated with a value given to the key. The keys in this array are unique identifiers that can be used to retrieve their respective values. In an associative array the keys ... Read More
As per the problem statement we have to write a Java program to replace each element of the array with its next element. In Java, the array is an object. It is a non-primitive data type which stores values of similar data types. Before discussing the solution for the given problem, let's understand the problem statement with an example − Example Scenario: Input: arr[] = {12, 23, 11, 64} Output: updated array = {23, 11, 64, 12} Algorithm Follow the steps below to replace each element of the array with its next element − Step 1 − Declare ... Read More
Given a string and its substring(s) of length k, write a Java program to compare and find whether the substrings are equal or not. Substring is a small portion of characters from a large string. In Java, a String is a class that represents a contiguous block of characters. Using compareTo() Method The compareTo() method belongs to the String class of java.lang package. It compares two strings based on the Unicode value of each character contained in the strings. It returns 0 if the specified strings are equal. Example In this example, we are using the compareTo() method to ... Read More
Suppose an integer number is given as an input, our task is to write a Java program to count the number of digits in that integer. For this problem, create a counter variable and initialize it with 0. Divide the given integer value with 10 till the integer becomes 0 and increment the counter variable for each turn. Using while Loop A while loop in Java is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. For the given problem, we use this loop to check whether the specified integer value is ... Read More
A block of code that is associated with the static keyword is called as static block. This block executes when classloader loads the class. Remember, if your code contains any static block, it will be invoked before the main() method. In this article, we will learn how to create and invoke static blocks in Java along with its use case. But, before that let's understand the static keyword. What is Static Keyword? The static keyword in Java is a non-access modifier. This keyword is used with variables, methods, blocks of code and classes. A class, method or variable declared with ... Read More
The special characters, also known as metacharacters, in Java Regex holds a specific meaning within the regex syntax and must be escaped if you want to use them as regular characters. Here, we will demonstrate escaping characters in Regex through Java Program. But, before diving deep into the topic, let us get familiar with the term Regex in Java. What is Regex? It is an acronym for a Regular expression. It is an API that offers users to define String patterns that are useful for finding, modifying, and editing strings. A couple of areas of strings where Regex is ... Read More
There could be numerous interview questions on Constructors, it is not possible to cover all in just one article. However, we have researched and assorted the most popular Java interview questions on Constructors. In most of the Java interviews, the interviewers always start by asking basic questions. They can test one's knowledge in just a few minutes of the interviews. Therefore, it is essential to get thorough with the fundamental concepts of Java such as class, object and constructor. In Java interviews, the first question one might encounter is to define constructors. So, let's start our discussion with this question. ... Read More
We can create a grid of subplots by using plt.subplot() or plt.subplots() methods in python Matplotlib . 'subplots' refers collection of multiple plots within a single figure, where each subplot is an axis object. We can create multiple subplots by seting the spine visibility false out of multiple axes. Plotting grids across subplots Steps involved to plot grids across the subplots are follows. Setting parameters for figure Creating ... Read More
In PHP, the 'exec()' or 'shell_exec’ function can be used. It can be executed via the shell and the result can be returned as a string. It returns an error if NULL is passed from the command line or returns no output at all. 'exec()' Function The exec function is used for executing commands in the shell and command line of an external program and optinally capture the last line of the output. Syntax exec(string $command, array &$output = null, int &$return_var = null); 'shell_exec()' Function The shell_exec is similiar to exec but it captures and return the ... Read More
We can click on a link on page with the help of locators available in Selenium. Link text and partial link text are the locators generally used for clicking links. Both these locators work with the text available inside the anchor tags. Link Text: In Selenium a link text is used to hyperlinks on a web page, to create the hyperlinks on a webpage, we can use anchor tag followed by link Text. ... Read More