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Raja
has Published
806
Answers
How to print pid, info, children, and destroy processes in JShell in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 03-May-2020 13:14:53
JShell is a Java Shell tool used to execute simple java statements like classes, methods, interfaces, enums, and etc.. evaluates it, and prints the result in a command-line prompt.Java has improved Process API to manage and control operating system processes. ProcessHandle interface identifies and provides control of native processes, methods to check ...
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How to get system properties in JShell in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 02-May-2020 14:33:15
JShell is a REPL (Read-Evaluate-Print-Loop) tool used to execute simple statements, evaluates it, and displays the result without a main() method. We can start it by simply type "jshell" in command-line prompt.We need to get the system properties by using System.getProperty() and System.getProperties() methods.In the below code snippet, we can able ...
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How to implement JShell using JavaFX in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 02-May-2020 13:15:07
JShell is an interactive tool used to implement sample expressions. We can implement JShell programmatically using JavaFX application then we need to import a few packages in the java program listed belowimport jdk.jshell.JShell; import jdk.jshell.SnippetEvent; import jdk.jshell.VarSnippet;In the below example, implemented a sample Java FX application. We will enter different values in ...
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How to implement HashMap, LinkedHashMap, and TreeMap in JShell in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 01-May-2020 20:54:58
JShell is a command-line prompt tool introduced in Java 9, and it is also called a REPL tool to evaluate simple statements, executes it, and print the output immediately.A Map interface specifies a contract to implement collections of elements in the form of key/value pairs. Java collection classes that implement the Map interface are ...
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Differences between CompletableFuture and Future in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 01-May-2020 15:15:14
CompletableFuture<T> class implements Future<T> interface in Java. CompletableFuture can be used as a Future that has explicitly completed. The Future interface doesn’t provide a lot of features, we need to get the result of asynchronous computation using the get() method, which is blocked, so there is no scope to run multiple dependent tasks in ...
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How to get a snapshot of information about Process API in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 01-May-2020 12:03:51
Java 9 has improved Process API by including new methods and introduced new interfaces ProcessHandle and ProcessHandle.Info to get all the details regarding the process and its information.ProcessHandle interface can identify and provide control of native processes. Each individual process can be monitored for liveness, listed its children, get information about the process, ...
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Importance of destroyForcibly() method in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 30-Apr-2020 20:51:25
The destroyForcibly() method can be used to kill a process. It will be needed if the process has finished or has frozen. For instance, the isAlive() method returns true after destroyForcibly() is called. The destroyForcibly() method returns true if the termination successfully requested, otherwise returns false.Syntaxboolean destroyForcibly()In the below example, ...
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How to implement a Set interface in JShell in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 30-Apr-2020 15:14:59
JShell is a command-line tool in Java 9 that has been used to execute simple statements like expressions, classes, interfaces, methods, and etc.A Set is an interface in Java that specifies a contract for collections having unique elements. If object1.equals(object2) returns true, then only one of object1 and object2 have a ...
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Differences between Jdeps and Jdeprscan tools in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 30-Apr-2020 11:53:25
Jdeps tool can be used to analyze the dependencies of our classes. The running of the "jdeps -jdkinternals jararchive.jar" command prints a list of all classes that use Java internal API. Jdeps tool returns a detailed description of the dependencies while Jdeprscan is another useful tool particularly used in combination with the "-for-removal" ...
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What is the importance of the jcmd tool in Java 9?
Java
Object Oriented Programming
Programming
raja
Published on 29-Apr-2020 17:48:03
The "jcmd" is JVM diagnostic tool, which is a command-line tool to run diagnostic commands against given JVM on the local machine. This tool has been included in the JDK installation since Java 7 version, and it can be represented by the "%java_home%\bin\jcmd.exe" program file. If we have "%java_home%\bin" directory included in ...
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