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Technical articles with clear explanations and examples
Explain the Mandatory Attribute in PowerShell Advanced Function.
We have an example of PowerShell advanced function below and we will try to understand how mandatory parameter works.function math_Operation{ [cmdletbinding()] param([int]$val1, [int]$val2) Write-Host "Multiply : $($val1*$val2)" Write-Host "Addition : $($val1+$val2)" Write-Host "Subtraction : $($val1-$val2)" Write-Host "Divide : $($val1+$val2)" }When you execute the above example and don’t supply values then the script won’t ask you for the values, by default it will take the values and execute the program. See the execution below.PS C:\WINDOWS\system32> math_Operation Multiply : 0 Addition : 0 Subtraction : 0 Divide : 0Even if you have mentioned two variables ($val1, ...
Read MoreExplain the PowerShell Advanced Function.
Before starting the Advance PowerShell function, assuming we know about the PowerShell function. You can check the explanation on the PowerShell function below.https://www.tutorialspoint.com/explain-the-powershell-functionHere, we will take the math function example that calculates the different types of operations. We already have a code with the simple function as shown below.function math_Operation{ param([int]$val1, [int]$val2) Write-Host "Multiply : $($val1*$val2)" Write-Host "Addition : $($val1+$val2)" Write-Host "Subtraction : $($val1-$val2)" Write-Host "Divide : $($val1+$val2)" }The above example is of the simple function. When you run the above code and run the function from the terminal and you can notice you will ...
Read MoreHow to print pid, info, children, and destroy processes in JShell in Java 9?
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 processes liveness, and destroy the process. ProcessHandle.Info interface gives an Information snapshot of a process.In the below code snippet, we can print pid, info, children, and destroy processes of Process API.in JShell tool.Snippetjshell> ProcessHandle currentProcess = ProcessHandle.current(); currentProcess ==> 3960 jshell> System.out.println("Current Process Id: = " + currentProcess.pid()); Current Process Id: = 3960 jshell> ...
Read MoreHow to get system properties in JShell in Java 9?
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 to display the system properties in the JShell tool by using static method property() of System class.Snippet-1jshell> System.getProperty("java.class.path") $1 ==> "C:\Program Files\Java\jdk-9.0.4\lib;C:\json-jars\json.jar;.;C:\json-jars\json-simple.jar;.;C:\json-jars\gson.jar;.;C:\json-jars\commons-io.jar;.;C:\json-jars\jackson-core.jar;.;C:\json-jars\jackson-databind.jar;.;C:\json-jars\jackson-annotations.jar;.;C:\json jars\flexjson.jar;.;C:\json-jars\jackson-dataformat-xml.jar;.;C:\json-jars\stax2-api.jar;.;C:\json-jars\jackson-dataformat-csv.jar;.;C:\json-jars\javax.json.jar;.;C:\json jars\javax.json-api.jar;.;C:\json-jars\jackson-module-jsonSchema.jar;.;C:\json-jars\json-lib.jar;.;C:\json-jars\commons-lang.jar;.;C:\json-jars\commons-logging.jar;.;"In the below code snippet, we have to use the “properties” object that extends Hashtable. So all properties can be listed as key/value pairs in the JShell tool by using ...
Read MoreHow to implement JShell using JavaFX in Java 9?
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 the text field and press the "eval" button. It will display values with corresponding data types in a list.Exampleimport javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.Stage; import java.util.List; import jdk.jshell.JShell; import jdk.jshell.SnippetEvent; import jdk.jshell.VarSnippet; public class JShellFXTest extends Application { @Override public void start(Stage primaryStage) ...
Read MoreHow to implement HashMap, LinkedHashMap, and TreeMap in JShell in Java 9?
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 HashMap, LinkedHashMap, and TreeMap.In the below code snippet, the elements of HashMap are not guaranteed to store either in an insertion order or in the sorted order of keys.Snippet-1jshell> HashMap hashMap = new HashMap(); hashMap ==> {} jshell> hashMap.put("Adithya", 101); $2 ==> null jshell> ...
Read MoreDifferences between CompletableFuture and Future in Java 9?
CompletableFuture class implements Future 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 a non-blocking fashion whereas CompleteFuture class can provide the functionality to chain multiple dependent tasks that run asynchronously, so we can create a chain of tasks where the next task is triggered when the result of the current task is available.Syntaxpublic class CompletableFuture extends Object implements ...
Read MoreHow to get a snapshot of information about Process API in Java 9?
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, or destroys it. ProcessHandle.Info interface gives information snapshots about a process.SyntaxProcessHandle.Info info()Examplepublic class ProcessSnapShotTest { public static void main(String[] args) { ProcessHandle currentProcessHandleImpl = ProcessHandle.current(); ...
Read MoreImportance of destroyForcibly() method in Java 9?
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, we will able to launch a notepad application, and it will be terminated after the destroyForcibly() method called.Exampleimport java.io.IOException; import java.lang.ProcessBuilder; public class DestroyForciblyTest { public static void main(String args[]) throws IOException, InterruptedException { ProcessBuilder pBuilder = new ProcessBuilder(); ...
Read MoreBrace Expansion in C++
Suppose we have a string S that represents a list of words. Here each letter in the word has 1 or more options. If there is only one option, the letter is represented as is. If there is more than one option, then curly braces delimit the options. So for example, "{a, b, c}" will represent the options ["a", "b", "c"]. Now for example, if the input is like "{a, b, c}d{e, f}" this will represent the list ["ade", "adf", "bde", "bdf", "cde", "cdf"]. Return all words that can be formed in this manner, in lexicographical order. To ...
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