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Page 477 of 589
What is Variable Handle in Java 9?
Variable Handle is a variable or reference to a set of variables, including other components of a static field, non-static fields, and outer array elements in the heap data structure. It means that Variable Handle is similar to the existing Method Handle. It can be represented by using java.lang.invoke.VarHandle class. We can use java.lang.invoke.MethodHandles.Lookup static factory method to create Variable Handle objects. It can also be used to access a single element in the array, and byte[] array.Syntaxpublic abstract class VarHandle extends ObjectExampleimport java.lang.invoke.MethodHandles; import java.lang.invoke.VarHandle; import java.util.Arrays; public class VarHandleTest { public static void main(String ...
Read MoreJava program to calculate the GCD of a given number using recursion
You can calculate the GCD of given two numbers, using recursion as shown in the following program.Exampleimport java.util.Scanner; public class GCDUsingRecursion { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter first number :: "); int firstNum = sc.nextInt(); System.out.println("Enter second number :: "); int secondNum = sc.nextInt(); System.out.println("GCD of given two numbers is ::"+gcd(firstNum, secondNum)); } public static int gcd(int num1, int num2) { if (num2 != 0){ return gcd(num2, num1 % num2); } else{ return num1; } } }OutputEnter first number :: 625 Enter second number :: 125 GCD of given two numbers is ::125
Read MoreWhat is the importance of the ProcessHandle interface in Java 9?
ProcessHandle interface introduced in Java 9. It allows us to perform actions and check the state of a process that relates. This interface provides the process’s native process ID (pid), start time, accumulated CPU time, arguments, command, user, parent process, and descendants.ProcessHandle interface allows us to perform the following actions.It returns a ProcessHandle.Info containing further information about a processThe Pid of a processIf it is aliveRetrieve a snapshot of the direct children of a processRetrieve a snapshot of all descents of a processRetrieve a snapshot of all currently running processesAllow the process to be destroyedIt returns a CompletableFuture with a ProcessHandle for when the ...
Read MoreJava program to find the permutation when the values n and r are given
Permutation refers a number of ways in which set members can be arranged or ordered in some fashion. The formula of permutation of arranging k elements out of n elements is −nPk = n! / (n - k)!Algorithm1. Define values for n and r. 2. Calculate factorial of n and (n-r). 3. Divide factorial(n) by factorial(n-r). 4. Display result as a permutation.Exampleimport java.util.Scanner; public class Permutation { static int factorial(int n) { int f; for(f = 1; n > 1; n--){ ...
Read MoreJava program to display English alphabets
Following is an example to display English alphabets A to Z. Example public class DisplayingAtoZ { public static void main(String args[]){ char ch; System.out.println("List of alphabets are ::"); for(ch = 'A'; ch <= 'Z'; ch++ ){ System.out.print(ch+" "); } } } Output List of alphabets are :: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Read MoreJava program to calculate student grades
The following program accepts average from the user, calculates the grade and prints it.Examplepublic class CalculateStudentGrades { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter average of your marks (less than 100)::"); int average = sc.nextInt(); char grade; if(average>=80){ grade = 'A'; }else if(average>=60 && average=40 && average
Read MoreJava program to find the area of a circle
Area of a circle is the product of the square of its radius, and the value of PI, Therefore, to calculate the area of a rectangleGet the radius of the circle.Calculate the square of the radius.Calculate the product of the value of PI and the value of the square of the radius.Print the result.Exampleimport java.util.Scanner; public class AreaOfCircle { public static void main(String args[]){ int radius; double area; Scanner sc = new Scanner(System.in); System.out.println("Enter the radius of the circle ::"); radius = sc.nextInt(); ...
Read MoreWhat is Http/2 Client in Java 9?
Http/2 Client API introduced in Java 9. It has more performance improvements over Http/1.1 and also supports server-side push events. This makes the website efficient and faster to browse. Http/2 Client is an incubator module named jdk.incubator.httpclient, which means that all features are still not finalized, and new changes may come in future versions of java. It exports jdk.incubator.http package that contains all public APIs.To use Http/2 Client, we need to use the incubator module, we simply pass the httpclient module into JShell using the "–add-modules" command as belowC:\>jshell -v --add-modules jdk.incubator.httpclient | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help introExamplejshell> import jdk.incubator.http.*; jshell> HttpClient httpClient ...
Read MoreHow to debug JShell in Java 9?
JShell is a REPL tool that allows snippets of code to be run without placing them in classes. This tool provides a way to evaluate declarations, statements, and expressions in Java and no need to create the main() method to test some parts of the code.The command "/debug" can be used to display debugging information for the JShell tool implementation. Once we type the "/debug" command, the debugging mode is on. After enabling the debug mode and type something like a simple addition, or a simple string, then it prints as below.Example-1jshell> /debug | Debugging on jshell> 5+3 Compiling: ...
Read MoreHow to implement a String in JShell in Java 9?
JShell is Java’s first official REPL application introduced in Java 9. It is a tool that helps in executing and evaluating simple java programs, and small logics such as statements, simple programs, loops, expressions, etc. Java REPL can provide a simple programming environment in a command-line prompt. It reads the input, evaluates it, and prints the output.In the below example, we can implement a string with pre-defined methods of String class.Examplejshell> String str = "{abcd}"; str ==> "{abcd}" jshell> str.substring(2, str.length() - 1) $7 ==> "bcd" jshell> String s1 = new String("abcd"); s1 ==> "abcd" jshell> String ...
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