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In this article, we will learn to implement Quicksort recursively in JavaScript. Quicksort is one of the most efficient and widely used sorting algorithms, known for its divide-and-conquer approach. What is Quicksort? Quicksort is a divide-and-conquer sorting algorithm that sorts an array by selecting a pivot element and partitioning the array into two subarrays: elements smaller than the pivot and elements greater than or equal to the pivot. It then recursively sorts the subarrays. Algorithm Quicksort follows the below steps − Step 1 − Make any element the pivot (preferably first or last, ... Read More
In this article, we will learn to sort maps by keys in Java. In Java, the Map interface provides a collection of key-value pairs where each key is unique. Sorting a map by its keys can be useful when you want to order the elements based on the keys instead of their values. Sorting a Map in Java Java provides different ways to sort a map by keys. A TreeMap, a part of the java.util package is one of the easiest ways to sort a map. It stores the map entries in a natural order (ascending) based on the ... Read More
Adding rows dynamically to a JTable is a common task in Java Swing when working with user interfaces that involve tabular data. This article walks you through creating a Java Swing application that appends a new row to a JTable when the user inputs data and clicks a button. What is JTable? A JTable is a powerful Swing component for displaying and editing tabular data. By using a DefaultTableModel, we can manage the table's data dynamically, including adding or removing rows. This makes it an excellent choice for applications requiring user interaction. Approach Following are the steps to append a row ... Read More
In this article, we will learn that concurrency in Java allows multiple threads to execute simultaneously, sharing system resources efficiently. One of the methods provided in the Thread class for managing thread execution is the yield() method. What is the yield() Method? The yield() method is a static method of the Thread class that hints to the thread scheduler that the current thread is willing to pause its execution in favor of other threads of the same or higher priority. It is part of Java's concurrency toolbox and is primarily used for fine-tuning thread execution. Syntax of yield function − ... Read More
An interface is like a reference type, similar to a class that enforces the rules that the class must implements(It is a keyword). An interface may have abstract methods i.e. methods without a definition and also constants or variables with fixed value. What is a Runnable interface in Java? If your class is intended to be executed as a thread, then you can achieve this by implementing a Runnable interface. This belongs to the java.lang package. The Runnable interface in Java is a functional interface that enables the compiled code of the class to run as a separate thread. The ... Read More
To set the text of the label component to be left-justified and top-aligned, you need to set the alignment. Set the label to be on the left and top aligned − JLabel label = new JLabel("Department”); label.setVerticalAlignment(JLabel.TOP); Here, we have set the size of the label as well as the color that includes foreground and background color − label.setPreferredSize(new Dimension(220, 70)); label.setOpaque(true); label.setBackground(Color.MAGENTA); label.setForeground(Color.WHITE); In Java, when we talk about setting the content of a JLabel to be left-justified and top-aligned, we are referring to how the text or icon within the label is positioned relative to the label's ... Read More
The sum of alternate elements has various real-life applications such as signal processing, data compression, pattern recognition, gaming, and financial data analysis. Problem Description In this article, we are going to learn how to find the sum of alternate elements of an array in C++. Alternate elements are present at even or odd indices of the array, depending on how we define them. Example 1 Inputarray = [1, 2, 3, 4, 5] OutputSum_even = 9Sum_odd = 6 Explanation The alternate elements at the even index are 1, 3, 5 (at ... Read More
To search for an element in a linked list, we need to go through each node one by one and check if its value matches the target element. If we find the element, we return its position in the list. If not, we return a message saying the element is not found. In this article, our task is to implement a JavaScript program that searches for a specific element in a linked list and returns its position if found, or a message if it is not present. Example Let's look at the below examples: Linked list: 10 -> ... Read More
SQL (Structured Query Language) is a programming language used to manage and interact with databases. In this case, the goal is to find the highest salary in each department from a table that contains employee data, including their salaries and the departments they work in. We'll write an SQL query to find the highest salary for each department, which is useful for analyzing salary trends, setting pay standards, and making informed business decisions. Finding the Highest Salary of Each Department To find the highest salary in each department, use SQL's GROUP BY and MAX() functions. The GROUP BY ... Read More
To query data in SQL where you need to match multiple values within the same column, you can use operators like IN and OR. For example, how would you find employees in the "Sales" or "Marketing" departments, or list those with job titles like "Manager" or "Salesperson"? These are common scenarios when filtering data based on multiple conditions in SQL: The IN operator allows you to match values from a list, while OR helps combine multiple conditions efficiently. In this article, we'll show you how to write SQL queries to match multiple values within the same column, making it easier ... Read More