What is ConcurrentHashMap? In Java, ConcurrentHashMap is a class that implements the Map<K,V> interface, and it is synchronised. When we declare a HashMap<K,V> in Java, the JVM internally assigns 16 buckets of memory to it. In ConcurrentHashMap, the lock is on each of the 16 buckets, which facilitates multiple write operations on different buckets concurrently… Read More »
1. String vs. StringBuilder | When to use String and StringBuilder in Java? Feature String StringBuilder Definition String is an immutable class in Java, which means once an object is created, its value cannot be changed. StringBuilder is used to create mutable string objects, which means we can change the content of the StringBuilder object.… Read More »
In Java, annotation is a form of metadata that provides information about the programs but it is not the part of the program itself. The annotations are used by compilers, development tools or runtime libraries for different purposes. We can write annotations with the help of the @ symbol followed by the annotation name. In… Read More »
What is a constructor in Java? In Java, constructors are a special type of method that is used to initialize the objects. It has the same name as that of a class and does not have a return type, not even void. Constructors are automatically called as soon as objects get created and set the… Read More »
In Java, immutable objects are objects whose state cannot be changed once they are created; they will remain constant throughout the lifecycle of the object. It helps in terms of simplicity, thread-safety and security. For example, string objects, In Java, string objects are immutable. i.e., once they are initialized, they cannot be changed. To learn… Read More »
Java Decompiler A Java decompiler is a reverse engineering tool that can be used to convert Java bytecode back to Java source code. It became useful when we had the compiled Java classes (in the form of bytecode, typically stored in a.class file) but not the original source code. In this tutorial, we will learn… Read More »
Lombok is a popular Java library that simplifies Java application development by reducing boilerplate code and making our codebase clean and easy to understand. It is an annotation-based library that provides several annotations to be used in Java classes to automatically generate the biolerplate codes for getters, setters, constructors, etc. These annotations are processed at… Read More »
What is Multithreading in Java? In multithreading, a program is divided into two or more subprograms or threads that can run concurrently (at the same time) in parallel or concurrently in a shared memory space. Each thread represents a separate flow of control within the program, allowing multiple operations to be performed simultaneously. Multithreading is… Read More »
The new version of Java, Java 21, is finally released on September 19, 2023, as the next long-term support (LTS) version. Because of this LTS version, it will be used in commercial support as the next stable version. After working on a total of 2585 JIRA issues, of which 1868 were resolved by Oracle and… Read More »
In Java, System.out.println() is a statement that is used to print the arguments passed to it to the standard output, typically a console window. Let us understand System.out.println in Java in detail: System System is a predefined final class present in the java.lang package. It is automatically imported in every Java program, we are not… Read More »