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Java 9 supports to create Reactive Streams by introducing a few interfaces: Publisher, Subscriber, Subscription, and SubmissionPublisher class that implements the Publisher interface. Each interface can play a different role corresponding to the principles of Reactive Streams.We can use the Subscriber interface to subscribe to the data that is being published by a publisher. We need to implement the Subscriber interface and provide an implementation for the abstract methods.Flow.Subscriber interface methods:onComplete(): This method has been called when the Publisher object completes its role.onError(): This method has been called when something goes wrong in Publisher and is notified to the Subscriber.onNext(): This method has been called whenever ... Read More
It occurs when Index is outside the bounds of the array.Let us see an example. We have declare an array with 5 elements and set the size as 5.int[] arr = new int[5]; arr[0] = 10; arr[1] = 20; arr[2] = 30; arr[3] = 40; arr[4] = 50;Now, we try to add the value of an element that extends the size of our array i.e.arr[5] = 60;Above, we are trying to add element at 6th position.Example Live Demousing System; using System.IO; using System.Collections.Generic; namespace Demo { class Program { static void Main(string[] args) { ... Read More
In general, a 2D shape is a geometrical figure that can be drawn on the XY plane, these include Line, Rectangle, Circle, etc.The javafx.scene.shape package provides you, various classes, each of them represents/defines a 2d geometrical object or, an operation on them. The class named Shape is the base class of all the 2-Dimensional shapes in JavaFX.Creating 2D shapesTo draw a 2D geometrical shape using JavaFX you need to −Instantiate the class − Instantiate the respective class. For example, if you want to draw a circle you need to instantiate the Circle class as shown below −//Drawing a Circle Circle ... Read More
This is class represents the path element arc. It helps you to draw an arc from the current coordinates to the specified (new) coordinates.To create a line path element −Instantiate the ArcTo class.Set values to the properties of this class using setter methods or, bypassing them to the constructor.Instantiate the Path class.Get the observable list object of the above-created Path using the getElements() method.Add the above created ArcTo object to the observable list using the add() method.Finally, add the path to the Group object.Exampleimport javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.shape.ArcTo; import javafx.scene.shape.LineTo; import javafx.scene.shape.MoveTo; import ... Read More
This is class represents the path element cubic curve. It helps you to draw a cubic curve form the current coordinates to the specified (new) coordinates.To create a line path element −Instantiate the CubicCurve class.Set values to the properties of this class using setter methods or, bypassing them to the constructor.Instantiate the Path class.Get the observable list object of the above-created Path using the getElements() method.Add the above created CubicCurve object to the observable list using the add() method.Finally, add the path to the Group object.Exampleimport javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.shape.CubicCurveTo; import javafx.scene.shape.LineTo; import javafx.scene.shape.MoveTo; ... Read More
This is class represents the path element quadratic curve. It helps you to draw a quadratic curve form the current coordinates to the specified (new) coordinates.To create a line path element −Instantiate the QuadCurveTo class.Set values to the properties of this class using setter methods or, bypassing them to the constructor.Instantiate the Path class.Get the observable list object of the above-created Path using the getElements() method.Add the above created QuadCurveTo object to the observable list using the add() method.Finally, add the path to the Group object.Exampleimport javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.shape.LineTo; import javafx.scene.shape.MoveTo; import ... Read More
This is class represents the path element vertical line. It helps you to draw a vertical line from the current coordinates to the specified (new) coordinates.To create a line path element −Instantiate the VLineTo class.Set values to the properties of this class using setter methods or, bypassing them to the constructor.Instantiate the Path class.Get the observable list object of the above-created Path using the getElements() method.Add the above created VLineTo object to the observable list using the add() method.Finally, add the path to the Group object.Exampleimport javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.shape.HLineTo; import javafx.scene.shape.LineTo; import ... Read More
This is class represents the path element horizontal line. It helps you to draw a horizontal line form the current coordinates to the specified (new) coordinates.To create a line path element −Instantiate the HLineTo class.Set values to the properties of this class using setter methods or, bypassing them to the constructor.Instantiate the Path class.Get the observable list object of the above-created Path using the getElements() method.Add the above created HLineTo object to the observable list using the add() method.Finally, add the path to the Group object.Exampleimport javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.shape.HLineTo; import javafx.scene.shape.LineTo; import ... Read More
The javafx.scene.shape.LineTo class represents the path element line. It helps you to draw a straight line from the current coordinates to the specified (new) coordinates.To create a line path element −Instantiate the LineTo class.Set values to the properties of this class using setter methods or, bypassing them to the constructor.Instantiate the Path class.Get the observable list object of the above-created Path using the getElements() method.Add the above created LineTo object to the observable list using the add() method.Finally, add the path to the Group object.Exampleimport javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.shape.LineTo; import javafx.scene.shape.MoveTo; import javafx.scene.shape.Path; ... Read More
The javafx.scene.shape package provides classes using which you can draw various 2D shapes, but these are just primitive shapes like line, circle, polygon, and ellipse, etc… Therefore, if you want to draw complex custom shapes you need to use the Path class.The Path ClassThe Path class represents the geometrical outline of a shape using this class you can draw your custom path.To draw a custom path JavaFX provides various path elements and, all these are available as classes in the javafx.scene.shape package.LineTo − This is class represents the path element line. It helps you to draw a straight line from the ... Read More