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Programming Articles
Page 2353 of 2547
How to implement JShell using JavaFX in Java 9?
JShell is an interactive tool used to implement sample expressions. We can implement JShell programmatically using JavaFX application then we need to import a few packages in the java program listed belowimport jdk.jshell.JShell; import jdk.jshell.SnippetEvent; import jdk.jshell.VarSnippet;In the below example, implemented a sample Java FX application. We will enter different values in the text field and press the "eval" button. It will display values with corresponding data types in a list.Exampleimport javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.Stage; import java.util.List; import jdk.jshell.JShell; import jdk.jshell.SnippetEvent; import jdk.jshell.VarSnippet; public class JShellFXTest extends Application { @Override public void start(Stage primaryStage) ...
Read MoreHow to implement HashMap, LinkedHashMap, and TreeMap in JShell in Java 9?
JShell is a command-line prompt tool introduced in Java 9, and it is also called a REPL tool to evaluate simple statements, executes it, and print the output immediately.A Map interface specifies a contract to implement collections of elements in the form of key/value pairs. Java collection classes that implement the Map interface are HashMap, LinkedHashMap, and TreeMap.In the below code snippet, the elements of HashMap are not guaranteed to store either in an insertion order or in the sorted order of keys.Snippet-1jshell> HashMap hashMap = new HashMap(); hashMap ==> {} jshell> hashMap.put("Adithya", 101); $2 ==> null jshell> ...
Read MoreDifferences between CompletableFuture and Future in Java 9?
CompletableFuture class implements Future interface in Java. CompletableFuture can be used as a Future that has explicitly completed. The Future interface doesn’t provide a lot of features, we need to get the result of asynchronous computation using the get() method, which is blocked, so there is no scope to run multiple dependent tasks in a non-blocking fashion whereas CompleteFuture class can provide the functionality to chain multiple dependent tasks that run asynchronously, so we can create a chain of tasks where the next task is triggered when the result of the current task is available.Syntaxpublic class CompletableFuture extends Object implements ...
Read MoreHow to get a snapshot of information about Process API in Java 9?
Java 9 has improved Process API by including new methods and introduced new interfaces ProcessHandle and ProcessHandle.Info to get all the details regarding the process and its information.ProcessHandle interface can identify and provide control of native processes. Each individual process can be monitored for liveness, listed its children, get information about the process, or destroys it. ProcessHandle.Info interface gives information snapshots about a process.SyntaxProcessHandle.Info info()Examplepublic class ProcessSnapShotTest { public static void main(String[] args) { ProcessHandle currentProcessHandleImpl = ProcessHandle.current(); ...
Read MoreImportance of destroyForcibly() method in Java 9?
The destroyForcibly() method can be used to kill a process. It will be needed if the process has finished or has frozen. For instance, the isAlive() method returns true after destroyForcibly() is called. The destroyForcibly() method returns true if the termination successfully requested, otherwise returns false.Syntaxboolean destroyForcibly()In the below example, we will able to launch a notepad application, and it will be terminated after the destroyForcibly() method called.Exampleimport java.io.IOException; import java.lang.ProcessBuilder; public class DestroyForciblyTest { public static void main(String args[]) throws IOException, InterruptedException { ProcessBuilder pBuilder = new ProcessBuilder(); ...
Read MoreBrace Expansion in C++
Suppose we have a string S that represents a list of words. Here each letter in the word has 1 or more options. If there is only one option, the letter is represented as is. If there is more than one option, then curly braces delimit the options. So for example, "{a, b, c}" will represent the options ["a", "b", "c"]. Now for example, if the input is like "{a, b, c}d{e, f}" this will represent the list ["ade", "adf", "bde", "bdf", "cde", "cdf"]. Return all words that can be formed in this manner, in lexicographical order. To ...
Read MoreReveal Cards In Increasing Order in C++
Suppose we have a deck of cards; every card has a one unique number. We can order the deck in any order that we want. So Initially, all the cards start face down (unrevealed) in one deck. Now, we do the following steps multiple times, until all cards are revealed − Take the top card off the deck, reveal it, and answer with it. If there are still cards in the deck, then put the next top card of the deck at the bottom of the deck. If there are still unseen cards, go back to step 1. Otherwise, ...
Read MoreSort an Array in C++
Suppose we have an array of integers; we have to sort them in ascending order. So if the array is like [5, 2, 3, 1], then the result will be [1, 2, 3, 5]To solve this, we will follow these steps −Make one method called partition, this will take array, low and highset pivot := lowfor i in range low to high – 1if nums[i] < nums[high], then swap(nums[i] and nums[pivot]), increase pivot by 1swap nums[pivot] and nums[high]Define a method called sortArr(), this will take array, low and highif low >= high, then returnpartitionIndex := partition(nums, low, high)sortArr(nums, low, partitionIndex ...
Read MoreHow to implement a Set interface in JShell in Java 9?
JShell is a command-line tool in Java 9 that has been used to execute simple statements like expressions, classes, interfaces, methods, and etc.A Set is an interface in Java that specifies a contract for collections having unique elements. If object1.equals(object2) returns true, then only one of object1 and object2 have a place in Set implementation.In the below code snippet, we have to use the Set.of() method. The collection returned by the Set.of() method is immutable, so it doesn't support the add() method. If we trying to add an element, throws UnsupportedOperationException. If we want to create a HashSet collection instead, ...
Read MorePossible Bipartition in C++
Suppose we have a set of N people (they are numbered 1, 2, ..., N), we would like to split everyone into two subgroups of any size. Now each person may dislike some other people, and they should not go into the same group. So, if dislikes[i] = [a, b], it indicates that it is not allowed to put the people numbered a and b into the same group. We have to find if it is possible to split everyone into two groups in this way.So if the input is like N = 4 and dislike = [[1, 2], [1, ...
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