Raja has Published 737 Answers

How to reset the JShell session in Java 9?

raja
raja
Published on 07-Apr-2020 09:22:26
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 ... Read More

What are the different feedback modes in JShell in Java 9?

raja
raja
Published on 06-Apr-2020 14:22:14
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 ... Read More

What is the structure of JDK and JRE directory in Java 9?

raja
raja
Published on 06-Apr-2020 12:26:15
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 ... Read More

How to set a verbose mode in JShell in Java 9?

raja
raja
Published on 06-Apr-2020 09:04:52
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 ... Read More

How to print previously typed snippets in JShell in Java 9?

raja
raja
Published on 03-Apr-2020 17:07:48
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 ... Read More

What are the changes in Memory Management in Java 9?

raja
raja
Published on 03-Apr-2020 14:09:51
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 ... Read More

What are the conditions for Collection factory methods in Java 9?

raja
raja
Published on 03-Apr-2020 10:33:04
In Java 9, factory methods have been added to Collections API. We can create an unmodifiable list, set and map collection objects in order to reduce the number of lines of code by using it. The List.of(), Set.of(), Map.of(), and Map.ofEntries() are the static factory methods provides convenient way of creating immutable collections.Below are ... Read More

Effectively final variables in try-with-resources in Java 9?

raja
raja
Published on 03-Apr-2020 08:43:39
Any variable that has been used within Try with Resource statements requires to be declared within the Try statement up to Java 8 version. Since Java 9, this restriction has been removed, and any final or effectively final variables have been used inside the Try block. Effectively final means that ... Read More

How can we import a gson library in JShell in Java 9?

raja
raja
Published on 02-Apr-2020 16:46:03
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 ... Read More

What are the different status states of REPL in Java 9?

raja
raja
Published on 02-Apr-2020 12:50:55
REPL stands for Read-Evaluate-Print-Loop. It holds some states, and each statement in JShell has a state. This state denies the execution status of snippets and variables. It can be determined by the results of the eval() method of JShell instance, which evaluates the code.There are seven different status states listed below.DROPPED: The ... Read More
1 2 3 4 5 6 7 ... 74 Next
Advertisements