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The javafx.event package provides a framework for Java FX events. The Event class serves as the base class for JavaFX events and associated with each event is an event source, an event target, and an event type. An ActionEvent widely used when a button is pressed.In the below program, we can implement an ActionEvent for a button by using method reference.Exampleimport javafx.application.*; import javafx.beans.property.*; import javafx.event.*; import javafx.scene.*; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.*; import javafx.scene.effect.*; public class MethodReferenceJavaFXTest extends Application { private Label label; public static void main(String[] args) { launch(args); } @Override public void start(Stage primaryStage) { ... Read More
If you want to specify the number of occurrences while constructing a regular expression you can use quantifiers. Java supports three types of quantifiers namely: greedy quantifiers, reluctant quantifiers and possessive quantifiers.Greedy quantifiers − Greedy quantifiers are the default quantifiers. A greedy quantifier matches as much as possible from the input string (longest match possible) if match not occurred it leaves the last character and matches again.Exampleimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter input text: "); ... Read More
To find the sum of such series, the Java program is as follows −Example Live Demopublic class Demo { static long my_val = 1000000007; public static long compute_val(long my_int){ return ((my_int % my_val) * (my_int % my_val)) % my_val; } public static void main(String[] args){ long my_int = 45687234; System.out.println("The computed value is "); System.out.print(compute_val(my_int)); } }OutputThe computed value is 335959495A class named Demo defines a function named ‘compute_val’ that computes and returns the sum of a specific series. In the main function, the ... Read More
ToDoubleFunction is a functional interface defined in java.util.function package. This functional interface expects a parameter as input and produces a double-valued result. It is used as an assignment target for a lambda expression or method reference. ToDoubleFunction interface contains only one abstract method, applyAsDouble().Syntax@FunctionalInterface public interface ToDoubleFunction { double applyAsDouble(T value); }Example-1import java.util.function.ToDoubleFunction; public class ToDoubleFunctionTest1 { public static void main(String args[]) { ToDoubleFunction strLength = s -> s.length(); // lambda expression System.out.println("The length of a given String using lambda expression is: " + strLength.applyAsDouble("TutorialsPoint")); ToDoubleFunction innerClassImplementation = new ToDoubleFunction() ... Read More
To search a string in Matrix using split function, the code is as follows −Example Live Demoimport java.util.*; public class Demo { public static int search_string(String[] my_matrix, String search_string){ for (String input : my_matrix){ String[] my_value = input.split(search_string); if (my_value.length >= 2 || my_value.length == 0){ return 1; } else if (my_value.length == 1 && input.length() != my_value[0].length()){ return 1; } } ... Read More
JavaJava is an object oriented programming language as well as a computing platform.It is safe, quick and reliable.The code in Java is first converted into bytecode and then executed using a JVM (Java Virtual Machine).The java program that is converted into bytecode is stored with the help of the extension ‘.class’.Java doesn’t give any specific way in which associative arrays could be stored, instead there are implementations of various hash functions.Java programs that need to be run are stored with the extension ‘.java’.Java is a statically typed language, i.e type checking is performed during compile-time (not run-time).Single line comments in ... Read More
Program DescriptionIn geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles.Solid and Hollow Square will appear as shown belowAlgorithmFor Solid Square −Accept the Number of Rows from the user to draw the Solid Square For each Row, Print * for each Column to draw the Solid SquareFor Hollow Square −Accept the Number of Rows from the user to draw the Hollow Square For the First and Last Row, Print * for each Column For the Remaining Rows, Print * for the first and Last Column.Example/* Program to print hollow and ... Read More
In general, 10 packages are imported using the JShell.The following command shows the packages that were imported by default.jshell> /importOutputimport java.io.* import java.math.* import java.net.* import java.nio.file* import java.sql.* import java.util.* import java.util.regex* import java.util.function* import java.util.prefs* import java.util.stream.*Importing a specific package using JShelljshell> import java.util.*;
The Runnable interface is a functional interface defined in java.lang package. This interface contains a single abstract method, run() with no arguments. When an object of a class implementing this interface used to create a thread, then run() method has invoked in a thread that executes separately.Syntax@FunctionalInterface public interface Runnable { void run(); }In the below example, we can implement a Runnable interface by using an anonymous class and lambda expression.Examplepublic class RunnableLambdaTest { public static void main(String[] args) { Runnable r1 = new Runnable() { @Override public void run() { // anonymous class ... Read More
There are ambiguities while using variable arguments in Java. This happens because two methods can definitely be valid enough to be called by data values. Due to this, the compiler doesn’t have the knowledge as to which method to call.Example Live Demopublic class Demo { static void my_fun(double ... my_Val){ System.out.print("fun(double ...): " + "Number of args: " + my_Val.length ); for(double x : my_Val) System.out.print(x + " "); System.out.println(); } static void my_fun(boolean ... my_Val){ System.out.print("fun(boolean ...) " + "The number of ... Read More