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Java Articles
Page 332 of 450
How to reset the JShell session in Java 9?
Java 9 has introduced JShell for Java, and it allows us to evaluate code snippets such as declarations, statements, and expressions.During the JShell session, we need to reset it without closing and re-opening JShell then we can use the internal command: "/reset". By using this command, code entered during the current session has erased. It can be useful when we want to test new classes, create new variables, etc. while keeping the names previously used.In the below snippet, we have created variables x, y, and str. We can able to see all entered code snippets using the "/list" command. After that, we can apply ...
Read MoreWhat are the different feedback modes in JShell in Java 9?
When performing an operation in the JShell tool, it displays a message in return (success of the command, error, and type of a variable created as well as its value). It has been customized using the command: "/set feedback". This command displays the type of return currently configured as well as the different return modes available.jshell> /set feedback | /set feedback normal | | Available feedback modes: | concise | normal | silent | verboseThere are four feedback modes available in JShell as listed below:1) /set feedback normal: This is the default JShell feedback. When we evaluate an expression, JShell ...
Read MoreWhat is the structure of JDK and JRE directory in Java 9?
The directory structure of JDK and JRE are almost the same, except that JDK has two additional directories like jmods and include and also there is no JRE subdirectory in the JDK9 version. The JDK directory is the root directory for JDK software installation. This directory also includes copyright, readme, and src.zip files, which can be a source code archive file of the Java platform.JDK Directory Structure:JDK-9 - bin - conf - include - jmods - legal - libThe JDK/bin directory contains an executable and command-line launcher that can be defined by the modules linked to an image.The JDK/conf directory contains ...
Read MoreHow to set a verbose mode in JShell in Java 9?
JShell is the REPL tool that has introduced in Java 9. We can use this tool to execute simple snippets in the command-line prompt.When we enter an arithmetic expression, variable, etc in JShell, then it displays the result without details of the type of variable created. It is possible in JShell to display more information about the execution of an entered command, use verbose mode. We need to obtain more information on the commands executed by using the command: "/set feedback verbose" (the command can be preceded by "/").In the below snippet, the verbose mode is on, and it can ...
Read MoreHow to print previously typed snippets in JShell in Java 9?
JShell is an official Read-Evaluate-Print-Loop (REPL) introduced in Java 9. It provides an interactive shell for quickly prototyping, debugging, and learning Java and Java API without the need for a main() method.The "/list" command in JShell prints out all of the previously typed snippets of that particular session with a unique identifier called the snippet ID. By default, the output doesn't contain any snippet with only valid statements or expressions that can be shown. We need to see all previously typed code include errors, then pass the -all argument to the /list command.In the below code snippet, we have created ...
Read MoreWhat are the changes in Memory Management in Java 9?
Garbage Collection or simply GC is the core part of Memory Management in Java. It can be responsible for cleaning dead objects from memory and reclaiming that space. GC executes cleanup using predefined Garbage Collectors that uses certain algorithms.There are a few important types of Garbage Collectors listed belowSerial GC: A single thread collector and applies to small applications with small data usage. It can be enabled by specifying the command-line option: -XX:+UseSerialGC.Parallel GC: Parallel GC uses multiple threads to perform the garbage collecting process, and it's also known as the throughput collector. It can be enabled by explicitly specifying ...
Read MoreHow can we import a gson library in JShell in Java 9?
Java 9 introduced an interactive REPL command-line tool named JShell. It allows us to execute Java code snippets and get immediate results. We can import external classes that can be accessed from a JShell session through the classpath. The Gson library is a Java serialization/deserialization library intended for converting Java Objects into JSON and vice-versa.In the below code snippet, we can set the classpath in JShelljshell> /env --class-path C:\Users\User\gson.jar | Setting new options and restoring state.Once we have imported the gson library in JShell, able to see that library in the list.jshell> import com.google.gson.* jshell> /import | import java.io.* ...
Read MoreHow to implement the encapsulation concept in JShell in Java 9?
Java Shell (simply JShell) is a REPL interactive tool for learning the Java and prototyping Java code. It evaluates declarations, statements, and expressions as entered and immediately prints out the result and runs from the command-line.Encapsulation is an important concept in Java to make sure that "sensitive" data has been hidden from users. To achieve this, we must declare a class variable as private and provides public access to get and set methods and update the value of a private variable.In the below code snippet, we have implemented the Encapsulation concept for Employee class.jshell> class Employee { ...> private String firstName; ...> ...
Read MoreHow to check a string is palindrome or not in Jshell in Java 9?
JShell is the first REPL(Read-Evaluate-Print-Loop) interactive tool that has been introduced as a part of Java 9. It evaluates declarations, statements, and expressions as entered and immediately shows the results, and it runs from the command-line prompt.Palindrome string is a string where it remains the same when reversed or word spelled the same way in both forward and backward directions.In the below example, we can able to check whether the given string is palindrome or not in the JShell tool.C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> String str="LEVEL"; str ==> ...
Read MoreWhat are the core library changes in Process API in Java 9?
In Java 9, one can retrieve the PID of the process through a native call and can be achievable through the ProcessHandle. We can also retrieve information about the currently running Java Process (JVM) and Info (inner class of ProcessHandle) class that contains details about the process. We can also return a snapshot of all currently running processes in the system.Exampleimport java.lang.ProcessHandle.Info; public class ProcessAPIChanges { public void detailedAPIInfo(ProcessHandle processHandle) { Info processInfo = processHandle.info(); System.out.println("Detailed Process Info is Provided Below: "); ...
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