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Programming Articles
Page 2370 of 2547
How 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 ...
Read MoreWhat does the method toString(int[] a) do?
The toString(int[]) method of the class java.util.Arrays return a string representation of the contents of the specified int array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space).Exampleimport java.util.Arrays; public class ArrayDemo { public static void main(String[] args) { int[] i1 = new int[] { 33, 12, 98 }; System.out.println("The array is:"); for (int number : i1) ...
Read MoreWhat does the method fill(obj[], object val) do?
The fill(Object[] a, Object val) method of the java.util.Arrays class assigns the specified Object reference to each element of the specified array of Objects.Exampleimport java.util.Arrays; public class ArrayDemo { public static void main(String[] args) { Object arr[] = new Object[] {10.5, 5.6, 4.7, 2.9, 9.7}; System.out.println("Actual values: "); for (Object value : arr) { System.out.println("Value = " + value); } Arrays.fill(arr, 12.2); System.out.println("New values after using fill() method: "); for (Object value : arr) { System.out.println("Value = " + value); } } }OutputActual values: Value = 10.5 Value = 5.6 Value = 4.7 Value = 2.9 Value = 9.7 New values after using fill() method: Value = 12.2 Value = 12.2 Value = 12.2 Value = 12.2 Value = 12.2
Read MoreConnecting SAP in Ruby on Rails
Try downloading nwrfcsdk library from sap and follow instructions mentioned in Readme to perform the installation. Use function Module like ENQUEUE_READ to perform remote call as below −#!/usr/bin/env ruby require 'sapnwrfc' require 'rubygems' conn = SAPNW::Base.rfc_connect(:client => '800', :sysnr => '01', :lang => 'EN', :ashost => 'hostname', ...
Read MoreWhat is Common Locale Data Repository (CLDR) in Java 9?
Internationalization enhancements for Java 9 include enabling of CLDR Locale Data by Default.There are four distinct sources for locale data identified by using the below keywords:CLDR: The locale data provided by a Unicode Common Locale Data Repository (CLDR) project.HOST: The current user’s customization of an underlying operating system’s settings. Depending on the operating system, formats like date, time, number, and currency can be supported.SPI: The locale-sensitive services implemented in installed SPI providers.COMPAT (JRE): The locale data that is compatible with releases prior to Java 9. The JRE can still be used as a value but deprecated, and removed in the ...
Read MoreTrivial classes in C++
In this tutorial, we will be discussing a program to understand trivial classes in C++.When a class/ struct contains explicitly defaulted value inside it, then it is known as Trivial classes. Further trivial classes have their own constructor, assignment operator and destructor.Example//using the default constructor struct Trivial { int i; private: int j; }; //defining your own constructor //and then marking it as default struct Trivial2 { int i; Trivial2(int a, int b){ i = a; } Trivial2() = default; };Output(No output as we are just defining classes here and not creating object instances from them.)
Read MoreHow to implement an ArrayList using JShell in Java 9?
JShell is an interactive Java Shell tool that enables us to execute java code from the shell and instantly displays the output. JShell is the REPL(Read Evaluate Print Loop) tool that runs from the command-line. We can start a JShell by simply typing "jshell" in the command prompt, and to exit the jshell by using "/exit" command. For small snippets, we do not need to create a main() method in JShell.We can also implement the major collections like list, map and set by using this tool. In the below program, we can implement an ArrayList with various scenarios.ExampleC:\Users\User\Desktop\Java 9 QNA>jshell | Welcome to JShell ...
Read MoreWhat is Platform Logging API in Java 9?
In Java 9, Platform Logging API can be used to log messages with a service interface for consumers of those messages. An implementation of LoggerFinder has been loaded with the help of java.util.ServiceLoader API by using System ClassLoader. Based on this implementation, an application can plug in its own external logging backend without configuring java.util.logging.We can pass a class name or module to LoggerFinder so that it knows which logger to return.public class MyLoggerFinder extends LoggerFinder { @Override public Logger getLogger(String name, Module module) { // return a ...
Read MoreHow to filter stack frames using StackWalker API in Java 9?
StackWalker API provides a stream of information in stack traces during the execution of a program. This API requires a virtual machine to capture a snapshot of the entire stack and returns an array of elements for filtering purposes. We need to skip, drop, and limit the stack frames by using the walk() method. We can also filter a stack frame by class for getting the first matching frame, and all matching frames by using the filter() method.In the below example, we can filter a stack frame by using StackWalker API.Exampleimport java.lang.StackWalker.StackFrame; import java.util.*; import java.util.stream.*; public class StackWalkerFilterTest ...
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