Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles by raja
Page 32 of 38
What is Project Jigsaw in Java 9?
The primary objective of the Jigsaw project is to introduce the modularity concept to create a module in Java 9 and then applying the same to JDK.Below are some of the benefits of Modularity(Jigsaw)Strong Encapsulation: The modules can access only those parts that can be available for use. Unless the package is explicitly exported into the module-info.java file, public classes in a package can't be public.Clear Dependencies: A module must declare about other modules that they are used through the required clause. The modules are combined in order to create a shorter runtime that can be scaled to comparatively smaller ...
Read MoreWhat are the different compilation modes of a module in Java 9?
A module is a container of packages and each module contains a module descriptor that includes module name, module dependencies, it means that the name of other modules depends on and name of the packages it exports that can be used only by modules that depend on it.module com.tutorialspoint.app { /** Modules upon which the module com.tutorialspoint.app depends on */ requires com.tutorialspoint.services; /** Packages exposed by this module which can be used by other modules */ exports com.tutorialspoint.app.util; }There are three different compilation modes provided by Java 9 Module: Legacy mode, single module mode, and multi-module mode.Compilation modes of ...
Read MoreHow to declare a class and an interface in JShell in Java 9?
JShell can provide an interactive shell for quickly prototyping, debugging, and learning Java and Java API without the need for the main() method or need to compile our code before executing it.Declaration of Class:We can declare a class just like we have written a code in Java Language. The JShell can detect when the class completes it.In the below code snippet, we can declare a class Employee with two parameters and one method.C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> class Employee { ...> String ...
Read MoreImportance of transferTo() method of InputStream in Java 9?
The transferTo() method has been added to the InputStream class in Java 9. This method has been used to copy data from input streams to output streams in Java. It means it reads all bytes from an input stream and writes the bytes to an output stream in the order in which they are reading.Syntaxpublic long transferTo(OutputStream out) throws IOExceptionExampleimport java.util.Arrays; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; public class TransferToMethodTest { public void testTransferTo() throws IOException { byte[] inBytes = "tutorialspoint".getBytes(); ByteArrayInputStream bis = ...
Read MoreWhat are the benefits of a module in Java 9?
An important feature introduced in Java 9 is Module. By using a module, we can divide the code into smaller components called modules. It means each module has its own responsibility and declare its dependency on other modules to work correctly.Below are the steps to create a modular project in Java 9:Initially, we can create a file named "module-info.java" and add to a package(module) for which it is created. For instance, if our package name is com.mycompany.mypackage then the file goes to the same package (src/com.mycompany.mypackage/module-info.java). We can create a module by declaring "exports" and "requires" expressions.If our modules require another module ...
Read MoreHow many non-access modifiers are there in Java?
Java provides some other modifiers to provide the functionalities other than the visibility. These modifiers are called Non-Access ModifiersStatic The members which are declared as static are common to all instances of a class. Static members are class level members which are stored in the class memory.Final This modifier is used to restrict the further modification of a variable or a method or a class. The value of a variable which is declared as final can’t be modified once it gets a value. A final method can not be overridden in the subclass and you can not create a subclass ...
Read MoreStackWalker API in Java 9?
StackWalker API allows easy filtering and lazy access to execute tasks within any method. It is an efficient API for obtaining stack trace information in Java 9.There are three new important classes in StackWalker API: StackWalker, StackWalker.StackFrame and StackWalker.Option.StackWalker − It is the main class in StackWalker API. We traverse stack frames by using StackWalker.forEach() method and get caller class in an efficient way by calling StackWalker.getCallerClass() method. We walk through stack traces and applying a function on a stream of stack frames by using StackWalker.walk() method.StackWalker.StackFrame − It is a static nested class of StackWalker and represents method invocation ...
Read MoreDifferences between takewhile() and dropWhile() methods in Java 9?
The takewhile() method of Stream API accepts all values until predicate returns false whereas dropWhile() method of Stream API drops all values until it matches the predicate. If a stream is ordered, the takewhile() method returns a stream consisting of the longest prefix of elements taken from this stream that matches predicate whereas the dropWhile() method returns the remaining stream after matching predicate. If the stream is unordered, the takewhile() method returns a stream consisting of a subset of elements extracted from a stream that matches the given predicate whereas the dropWhile() method returns a stream consisting of the remaining ...
Read MoreWhat are the new methods added to an Optional class in Java 9?
An Optional class provides a container that may or may not contain a non-null value. This Optional class introduced in Java 8 to reduce the number of places in the code where a NullPointerException can be generated. Java 9 added three new methods to Optional class: or(), ifPresentOrElse() and stream() that help us to deal with default values.Optional.or()The or() method introduced in Java 9 and the parameter of this method is a functional interface Supplier. This method always gives us an Optional object that is not empty. If the Optional object is not empty, it returns the Optional object itself. ...
Read More@SafeVarargs annotation for private methods in Java 9?
The @SafeVarargs annotation was introduced in Java 7. This annotation applies to both final and static methods or constructors that take varargs parameters. This annotation used to make sure that a method does not perform unsafe operations on its varargs parameters. Since Java 9, @SafeVarargs annotation also applies to private instance methods.Syntax@SafeVarargs private void methodName(...) { // some statements }Exampleimport java.util.ArrayList; import java.util.List; public class SafevarargsTest { @SafeVarargs // Apply @SafeVarargs to private methods private void display(List... names) { for(List name : names) { System.out.println(name); } } public static void ...
Read More