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The JTable component in Java Swing is widely used for displaying and managing tabular data. Adding a new row dynamically to a JTable can enhance user interactivity, especially in applications that require real-time data manipulation. In this article we will tell you a step-by-step procedure, to use the insertRow() method to add a new row to a JTable, complete with a sample implementation and an algorithm. What is JTable in Java Swing? JTable is a Swing component used for displaying and editing tabular data. It is highly customizable and supports features like sorting, selection, and dynamic data manipulation, making it ... Read More
In this article, we will learn two approaches to check if a number is pandigital using JavaScript. Pandigital numbers are fascinating because they include each digit at least once within a specific range. Checking if a number is pandigital can be a common problem in programming challenges or number theory explorations. What is a Pandigital Number? A Pandigital number is a number that includes all the digits within a specific range at least once. For example − A 0-9 pandigital number contains each digit from 0 to 9 at least once, regardless of order. ... Read More
In JavaScript, there are scenarios where we need to reverse the mapping of keys and values in an object, creating a new object where the original values become keys, and the keys become their corresponding values. For example, cities can be grouped by their states. In this article, we’ll learn two approaches to achieve this: using Object.keys with iteration and reduce. Iterating with Object.keys() The first approach involves iterating over the keys of the original object using Object.keys() of Object properties and populating a new object. If multiple keys in the original object share the same value, they are grouped into ... Read More
These days, the risks to online privacy and security are numerous. Considering we use our phones for most of our daily interactions and transactions, getting an extra layer of protection is worth it. Without added security, it only takes a single lapse for criminals to access the logins of your financial apps or prominent social media accounts. They could get into your phone and download your camera roll images for ransom. When you're on public WiFi, the risks increase. Cybercriminals exploit vulnerabilities in wireless hotspots. For all these dilemmas, only a VPN can provide a comprehensive solution. It keeps your ... Read More
What is a Vector in C++?A vector is a dynamic array as the size of the vector changes during the program's execution. If we insert more elements in the vector it expands its size and if we remove elements from the vector it shrinks in size. A vector is part of the Standard Template Library (STL). Problem DescriptionIn this problem, we are given a vector and have to insert an element at a certain position. In this article, we are going to learn how to insert multiple positions in a vector in C++ using different approaches. Below are some examples to ... Read More
In Java, the left-justifying output means aligning text or data to the left within a specified width, with extra spaces on the right to fill the remaining space. It is commonly used when displaying tabular data or formatting strings. Left justification can be obtained using methods such as String.format() or printf(), which allow you to specify the width of the output field and the alignment of the content. Including a minus sign after the %, makes it left justified. Note − By default, output is right justified To display the Left justify output in Java is quite easy. Let us learn the following methods: ... Read More
Sometimes, when doing a project for a specific organization in a particular country, we need to convert it into the users' local timezone. In this article, we are going to learn how to convert a date to a user's local timezone using moment.js. Prerequisite Moment.js: Moment.js is a popular JavaScript library used for dealing with dates. This library is used to modify, parse, validate, manipulate, and display dates and times in JavaScript. MomentJS works with UTC (Coordinated Universal Time) by default or any other specific time zone. Install Moment.js: npm install moment ... Read More
A multi-dimensional array can be easily printed using java.util.Arrays.deepToString() in Java. This method converts the multi-dimensional array to string and prints the array contents enclosed in square brackets. What Are Multi-Dimensional Arrays? Multi-dimensional arrays allow you to store data in a matrix-like structure, providing a way to represent tables, grids, or more complex hierarchical data. The most common type is a two-dimensional array, but Java supports arrays with more than two dimensions. int[][] array = new int[rows][columns]; Using Naive Approach The Arrays.deepToString(arr) method from the Arrays class ... Read More
PL/SQL is a block-structured language that combines SQL's functionality with procedural commands. In this article, we will discuss a program in PL/SQL to reverse a given number for example −Input : 98765 Output : 56789 Explanation : reverse number of 98765 is 56789. Input : 56784 Output : 48765 Explanation Reverse number of ‘56784’ is ‘48765’.Approach to find The SolutionTake out the last digit from the number by finding the remainder of num/10.Now add the last digit to another variable reversed_num.Now check if num becomes 0 −If YES, then go to STEP1.If NO, then go to STEP4.Finally, print the ... Read More
SQL query is used to fetch data from the database. In some of the scenario you may need some perquisite data to call subsequent SQL query to fetch data from a table so instead of writing two seperate query we can write SQL query within the query. Therefore subQuery is a way to combine or join them in single query. Subqurey can have two types −Correlated subquery - In correlated subquery, inner query is dependent on the outer query. Outer query needs to be executed before inner queryNon-Correlated subquery - In non-correlated query inner query does not dependent on the outer ... Read More