Welcome to Knowledge Basement

Linux, Java, Open Source related how-to articles

How to Work with Hazelcast Distributed Maps in Java

Distributed maps provide a way for applications to store and access data in a distributed environment, where the data is automatically distributed across multiple nodes in a cluster. There are several benefits to using distributed maps: Overall, using distributed maps can improve the scalability, fault tolerance, performance, and consistency of applications that need to store… read more »

Common Mistakes When Using Optional in Java

Optional in Java is a container object that is used to represent the presence or absence of a value. It is a powerful tool that can help to avoid null pointer exceptions and make code more robust. However, there are some common mistakes that developers can make when using Optional in Java: By avoiding these… read more »

How to Use Efficiently Generics in Java

In Java, generics provide a way to specify a type parameter for a class, method, or interface. A type parameter is a placeholder for a type that is specified at runtime, allowing code to be written that works with a variety of different types. Generics in Java offer several benefits: Here is an example of… read more »

What are the Benefits of the Diamond Operator in Java

The diamond operator in Java, also known as the empty angle bracket (<>) syntax, was introduced in Java 7 and provides several benefits: Overall, the diamond operator in Java provides a cleaner, safer, and more efficient way to work with generic types, improving the readability and maintainability of code. Here are some additional examples of… read more »

Why should You Use Method References in Java

In Java, a method reference is a shorthand notation for referring to a method as a lambda expression. Method references provide a way to pass a reference to a method without actually invoking the method, which can be useful in functional programming contexts where methods are treated as first-class objects. Method references are created using… read more »

How to Create Custom Annotations in Java

In Java, annotations are a form of metadata that provide additional information about program elements such as classes, methods, fields, and parameters. Annotations are defined using the ‘@’ symbol followed by an annotation name and can be added to a program element by including them in the source code. Annotations are typically used to provide… read more »

Why Python Replaced Perl

Both Perl and Python are powerful scripting languages that are used extensively in software development, system administration, and data analysis. Here are some key differences between the two languages: In recent years, Python has become the preferred language for many tasks, particularly in the areas of data science, machine learning, and web development. This is… read more »

How to Write Bash Script with User Input

Here’s a Linux bash script that performs the following tasks: #!/bin/bash # Prompt user to enter directory path echo “Enter a directory path:” read directory # Check if directory exists and create it if not if [ ! -d “$directory” ]; then mkdir “$directory” echo “Directory created: $directory” fi # Prompt user to enter file… read more »

How to Use the Java 8 Stream API to Perform Filtering, Mapping, and Reduction operations

The Java 8 Stream API is the best choice when it comes to working with collections. Here’s an example of how to use it to perform filtering, mapping, and reduction operations on a collection of objects: import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; public class StreamExample { public static void main(String[] args) { List<String> names =… read more »