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In this article, we will learn how to sort a stream of strings using a reversed comparator in Java. Java 8 introduced the Stream API, which allows powerful operations like sorting using custom comparators. Java Comparator A Comparator is a functional interface in Java that defines custom sorting logic. It compares two objects and returns a result based on the comparison. Java Stream A Stream is a sequence of elements that can be processed in parallel or sequentially, supporting methods like sorting, filtering, and mapping. Sorting string stream with a reversed comparator The following are the steps for sorting a ... Read More
In this article, we will learn how to print a diamond shape pattern using nested loops in Java. This helps in understanding loops and conditional structures in Java programming.A nested loop refers to a loop placed within another loop. This structure is often called "loops within loops" because the inner loop runs completely each time the outer loop iterates.Diamond Shape A diamond shape is a symmetrical pattern that consists of two parts: an upper triangle and a mirrored inverted triangle below it. In programming, such patterns are typically printed using nested loops to control spaces and symbols. A diamond ... Read More
In this article, we will learn how to check whether a file exists using Java. The program demonstrates the use of the exists() method from the java.io.File class to perform this check. Java.io.File.exists() MethodThe java.io.File.exists() method returns true if the file path exists, otherwise it returns false. Parameters: This method does not take any parameters. Return Value: It returns a boolean indicating whether the file specified by the abstract path exists. Checking whether a file exists or not in Java The following are the steps to check whether a file exists or not − Step 1. ... Read More
In this article, we will learn how to add a component to a JTextPane in Java. By using StyledDocument and StyleConstants, we can insert elements like buttons within the text pane, allowing us to create dynamic and interactive text-based components.JTextPaneJTextPane is a versatile text component in Java Swing that allows for styled text. It supports multiple text formats like bold, italic, and different fonts. It can also display rich text, such as embedded images or buttons, through the StyledDocument class. Inserting a component into a JTextPane The following are the steps to insert a component into a JTextPane − ... Read More
In this article, we will learn how to validate U.S. zip codes using a regular expression in Java. The program checks if a given string is a valid U.S. zip code, either in the standard five-digit format or the extended nine-digit format.Zip Code Format In the U.S., zip codes are five digits, with each digit representing a specific part of the United States.Let’s say we have the following zip code. String zipStr = "12345"; Now, set the following regular expression to match zip codes in America. String reg = "^[0-9]{5}(?:-[0-9]{4})?$"; Matching (Validating) a ZIP CodeThe following are the steps to ... Read More
In this article, we will learn how to get the display name for a day of the week in different locales using Java. The DayOfWeek class in Java provides methods to work with days of the week, and with the help of getDisplayName(), you can retrieve the name of a day in different formats based on the locale. Java.util.Locale.getDisplayName() Method The java.util.Locale.getDisplayName(Locale inLocale) method returns a name for the locale that is appropriate for display to the user. This will be the values returned by getDisplayLanguage(), getDisplayCountry(), and getDisplayVariant() assembled into a single string. Steps to get the display ... Read More
In this segment of Java programming, we are going to learn and discover certain programs by which we can represent linear equations in Matrix form. To do these programs, we first have to learn about linear equations and Matrix forms, their types, and how they are solved by simple mathematical methods. We will learn how to integrate a scanner class of java.util package to take input from the user using Java build code. The array will initialize to store some variables as input for the problem matrix. Then, it will be converted into a loop by which the problem equation will ... Read More
In this article, we will learn to remove duplicate elements from a List in Java. We will be using two methods: LinkedHashSet and the Stream API. First, we'll create a list with duplicate values and use LinkedHashSet to remove them while maintaining the order. Then, we’ll use the Stream API to filter out duplicates using distinct(). By the end, you’ll see how both methods work to clean up the list while keeping the original order. List in Java The List interface in Java, part of the Collection framework, represents an ordered collection of elements that allows duplicates and provides index-based ... Read More
To change the background color after clicking the button in JavaScript, we are going to discuss two different approaches. We have to perform two simple task, that is, adding a click event and changing the background color of the document. In this article our task is to understand how to change the background color after clicking the button in JavaScript. Approaches to Change Background Color on Clicking Button Here is a list of approaches to change the background color after clicking the button in JavaScript which we will be discussing in this article with stepwise explaination and complete example codes. ... Read More
A Heap is a Tree-based data structure in which the tree is a complete binary tree. Binary heap is of two types max heap and min heap. A min-heap is a tree-like structure in which the value of the parent node should always be less than both of its left and right child and follow this property recursively for all nodes until it reaches to leaf node. According to this property, the root node of the min-heap has the smallest value. In this article, we are going to check whether an array represents a min-heap or not. Problem Description We ... Read More