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Programming Articles
Page 1617 of 2547
What is the JLink tool in Java 9?
What is JLink? Java Linker is a new linker tool that has been used to create our own customized JRE. Usually, we can run our program using default JRE provided by Oracle. If we need to create our own JRE then use this tool. JLink tool can help to create its own JRE with only the required class to run the application. It can reduce the size of the API developed and the dependency of using the full JRE. In Java 9, we have a new phase between compiling the code and its execution, link time. Link time is an optional phase between the phases of ...
Read MoreHow to create scratch variables in JShell in Java 9?
JShell is a REPL interactive tool introduced in Java 9 to execute and evaluate simple Java programs like variable declarations, statements, expressions, and programs without using the main() method.In this article, we will learn to create scratch variables in JShell in Java 9. Variables in JShell In Java 9, JShell allows for the declaration and use of variables without the need for a surrounding class or method structure. One may be able to explicitly declare the variable with a type, or else it might be declared implicitly using var for type inference. C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 ...
Read MorePrinting the correct number of decimal points with cout in C++
When working with floating-point numbers in C++, it's important to know how to control the number of decimal places displayed in the output. By default, cout may not always print the expected number of digits after the decimal point.How to Print Correct Number of Decimal Points with cout?To display numbers with a specific number of decimal places using cout, you can use the setprecision() function, which accepts an integer value representing the number of digits after the decimal to be printed and returns a stream manipulator that formats the number with the specified precision. The setprecision() function belongs to the ...
Read MoreHow to initialize const member variable in a C++ class?
A const member variable in a C++ class is a data member whose value must be initialized during object construction and cannot be modified. Initializing Const Member Variable in C++ Class The const member variable must be initialized. To initialize a const member variable, you can use a member initializer list using a constructor, . The member initializer list is the special way to initialize the values to class variables while creating an object before the constructor block runs. Note: If the member is static and of an integer type, you can directly initialized with the class definition. ...
Read MoreHow to use POSIX semaphores in C language
The POSIX stands for Portable Operating System which was developed by IEEE (Institute of Electrical and Electronics Engineers). This is UNIX based operating system that is used for both system calls and library functions. The semaphores are used in the process of multithreading and synchronization. For eg. file sharing and memory management. It can be named or unnamed. Multithreading is the process of executing multiple tasks in the same instance of time while synchronization is used to control the thread to work in a sequential manner. It is important for data security. Using Semaphores in C language To use ...
Read MoreHow to define control flow statements in JShell in Java 9?
In this article, we will learn about the control flow statements in JShell in Java. JShell is a new interactive command-line tool introduced in Java 9. This tool can also be called REPL (Read-Eval-Print-Loop) because it takes input, evaluates it, and returns output to the user via the command line. JShell Control Flow Statements Control flow statements are used to control the execution path of the code and are a fundamental part of the Java programming language. We can execute multiple-line control flow statements using JShell in the same way as Java. It recognizes multiple-line statements are prompts with the ...
Read MoreHow to handle an exception in JShell in Java 9?
In this article, we will learn to handle an exception in JShell in Java 9. We will learn about the JShell, exceptions in Java, JShell exceptions, their handling, and Types of exceptions in JShell with examples. What is JShell? JShell is a new command-line interactive REPL (Read-Evaluate-Print-Loop) tool introduced in Java 9 to evaluate declarations, statements, and expressions written in Java. This tool also allows us to execute Java code snippets and get immediate results. C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> JShell provides a fast and friendly environment that ...
Read MoreWhat is the purpose of using Optional.ifPresentOrElse() method in Java 9?
In this article, we will learn about the purpose of using the Optional.ifPresentOrElse() method in Java 9. The Optional Class The Optional class was introduced in Java 8. Many Java developers face null pointer exceptions to avoid this, we need to put null checks we need to put if, to check if a method is null we can put it in the if statement; otherwise, we have to put it in the else statement. And to check this, we need to put this at multiple points to avoid this situation, We use the Optional class. It avoids the null pointer ...
Read MoreHow to use the PI constant in C++?
The Pi is a special mathematical value, approximately 3.14159, that is often used in calculations related to circles and geometry. In C++, we need to understand how to access and use this constant in our programs. In this article, we will show how to use the PI constant in a C++ program. The PI constant is available in the cmath header file. We will explain how to use PI to calculate values like the area or circumference of a circle. How to Use Pi in C++ There are multiple ways to use the Pi constant in C++. ...
Read MoreHow to import external libraries in JShell in Java 9?
In this article, we will learn to import external libraries in JShell in Java 9. JShell is an interactive tool to learn the Java language and prototype Java code. This tool works on the principle of REPL (Read-Evaluate-Print-Loop). Default Imports in JShell By default, JShell automatically imports a few useful Java packages when the JShell session is started. We can type the command /imports to get a list of all these imports. jshell> /imports | import java.io.* | import java.math.* | import java.net.* | import java.nio.file.* | import java.util.* | import java.util.concurrent.* | import java.util.function.* | import java.util.prefs.* | import ...
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