Problem StatementWith a given number n, write a program to find the difference between sum of the squares of and square of sum first n natural numbers.Examplen = 3 Squares of first three numbers = 3x3 + 2x2 + 1x1 = 9 + 4 + 1 = 14 Squares of sum of first three numbers = (3 + 2 + 1)x(3 + 2 + 1) = 6x6 = 36 Difference = 36 - 14 = 22Example Live DemoFollowing is the program in Java to find the required difference.public class JavaTester {    public static int difference(int n){   ... Read More

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 More

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 More

Flow API in Java 9 corresponds to Reactive Streams specification, which is a defacto standard. It contains a minimal set of interfaces that capture the heart of asynchronous publication and subscription.Below are the key interfaces of Flow API:1) Flow.Publisher: It produces items for subscribers to consume, and it contains only method: subscribe(Subscriber), whose purpose should be obvious.Syntaxvoid subscribe(Flow.Subscriber

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

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 More

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 More

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 More

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 More

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 ... Read More