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Object Oriented Programming Articles
Page 466 of 589
How can we implement methods of Stream API in Java 9?
Stream API provides lots of built-in functionality to help in performing operations on a collection using a stream pipeline. The API is declarative programming that makes the code precise and less error-prone. In Java 9, few useful methods have added to Stream API.Stream.iterate(): This method can be been used as stream version replacement for traditional for-loops.Stream.takeWhile(): This method can be used in a while loop that takes value while the condition is met.Stream.dropWhile(): This method can be used in a while loop that drops value while the condition is met.In the below example, we can implement the static methods: iterate(), takeWhile(), and dropWhile() methods of Stream ...
Read MoreWhat are the different startup scripts in JShell in Java 9?
JShell is an interactive Java Shell tool that executes code from the JShell and instantly displays an output. JShell is the REPL (Read-Evaluate-Print-Loop) tool that can run from the command-line prompt.In JShell, there is an option to load a script on startup that includes some special predefined options. These can be specified using the "--startup" flag passing in either a filename or one of DEFAULT, JAVASE, and PRINTING. We can use "/list -start" comamnd to see all startup snippets to be evaluated.DEFAULT: It loads the default behavior. This acts the same as if this is not specified at all.JAVASE: It ...
Read MoreWhat are the different "/edit" commands in JShell in Java 9?
JShell is a command-line tool introduced in Java 9 that evaluates declarations, statements, and expressions without the main() method. JShell can set up a text editor called JShell Edit Pad, which allows us to modify the code very easily, and it can be launched using the "/edit" command.Below are the different "/edit" commands used in Jshell./edit /edit [ID] /edit [Code_Name]/edit: This command can be used without an argument, the "/edit" command displays all the active code in the text editor./edit [ID]: This command displays in the text editor the code corresponding to the ID entered./edit [Code_Name]: This comamnd displays in the ...
Read MoreHow to get JShell documentation in Java 9?
Java 9 introduced a new interactive tool called JShell. This tool can be used to execute expressions, classes, interfaces, enums, and etc.The detailed documentation can be available in JShell with full information, as well as the use of its internal commands with the various options. This documentation can be accessed using two commands: "/help" and "/?". JShell's documentation is not only limited to information regarding its internal controls, and also includes Javadoc.In the below code snippet, the result can be obtained by using the "/help" command.jshell> /help | Type a Java language expression, statement, or declaration. | Or ...
Read MoreHow can we implement Flow API using Publisher-Subscriber in Java 9?
Flow API (java.util.concurrent.Flow) has introduced in Java 9. It helps to understand different ways in which the Publisher and Subscriber interfaces interact to perform desired operations.Flow API consists of Publisher, Subscriber, Subscription, and Processor interfaces, which can be based on reactive stream specification.In the below example, we can implement Flow API by using Publisher-Subscriber interfaces.Exampleimport java.util.concurrent.Flow.Publisher; import java.util.concurrent.Flow.Subscriber; import java.util.concurrent.Flow.Subscription; public class FlowAPITest { public static void main(String args[]) { Publisher publisherSync = new Publisher() { // Create publisher @Override public void subscribe(Subscriber
Read MoreWhat is text origin in JavaFX?
In addition to the local coordinate system for positioning its nodes, JavaFX provides an additional coordinate system for the text node.The textOrigin property specifies the origin of the coordinates of the text node in the parent coordinate system. You can set values to this property using the setTextOrigin() method. This method accepts one of the constants of the enum named VPos. This enum contains 4 constants namely: BASELINE, BOTTOM, CENTER and, TOP.Exampleimport java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.util.Scanner; import javafx.application.Application; import javafx.geometry.VPos; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.text.Text; public class TextOriginExample extends Application { ...
Read MoreHow to strike through and underline text in JavaFX?
In JavaFX, the text node is represented by the Javafx.scene.text.Text class. To insert/display text in JavaFx window you need to −Instantiate the Text class.Set the basic properties like position and text string, using the setter methods or, bypassing them as arguments to the constructor.Add the created node to the Group object.The strikethrough property of the javafx.scene.text.Text class determines whether each line of the text should have a straight line passing through the middle of it. You can set the value to this property using the setStrikeThrough() method. It accepts a boolean value. You can strike though the text (node) by ...
Read MoreHow to adjust the line spacing in the text node in JavaFX?
The line spacing property of the javafx.scene.text.The text class specifies the line spacing between the lines of the text (node) vertically.You can set the value to this property using the setLineSpacing() method. This method accepts a boolean value as a parameter and sets the specified space between the lines (vertically).Exampleimport java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.util.Scanner; import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.scene.text.Text; import javafx.scene.text.TextAlignment; public class TextSpacing extends Application { public void start(Stage stage) throws FileNotFoundException { //Reading the contents of a text file. InputStream inputStream ...
Read MoreHow to adjust the alignments of the text in JavaFX?
You can set a fixed width for the text in user space by setting the value to the wrappingWidth property. Once you do so, given width is considered as the boundary of the text in user coordinates and, the text is arranged width in the given width.If you haven’t given any value for this property, by default, the length longest line in the text is considered as the width of the bounding box.Text alignment is the arrangement of the text horizontally within the bounding box. You can adjust the alignment of the text using the setTextAlignment() method. This method accepts ...
Read MoreHow to wrap the text within the width of the window in JavaFX?
In JavaFX, the text node is represented by the Javafx.scene.text.Text class. To insert/display text in JavaFx window you need to −Instantiate the Text class.Set the basic properties like position and text string, using the setter methods or, bypassing them as arguments to the constructor.Add the created node to the Group object.If the length of the lines in the text you have passed, longer than the width of the window part of the text will be chopped as shown below −As a solution you can wrap the text within the width of the window by setting the value to the property wrapping ...
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