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This contains all posts related to Java basics.
Why I Switched to Virtual Threads (And Why You Should Too) In a recent high-traffic Spring Boot application I worked on, we hit a frustrating wall: our servers were crashing under load, yet our CPU usage was sitting at only 20%. The problem? We had exhausted our Tomcat thread pool. Our “Platform Threads” were stuck…
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Java Sealed Classes Recondite yet practical, sealed classes give you a way to declare a fixed set of permitted subclasses, enabling safer APIs, exhaustive pattern matching and clearer domain modeling. By constraining inheritance you reduce unintended extensions, simplify reasoning about behavior, and enable compiler/JVM optimizations that can improve memory utilization and performance. Use cases include…
Stop Memorizing Definitions: How to Actually Pass a Java Interview The “Senior Dev” Factor: Performance vs. Readability Before we dive into the top 50 questions, you need to understand what interviewers are actually looking for in 2025. It is rarely just “getting the right answer.” It is about knowing the trade-off between writing clean code…
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Over recent Java versions, you might have noticed the introduction of the Java record class, a compact and immutable data carrier designed to simplify your code. Unlike traditional classes, records automatically provide implementations for equals and hashCode, saving you time and reducing errors. You’ll find that records come with a default constructor and default values…
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Text blocks are introduced in java 13 and 14 as a preview feature and with java 15 it is available as standard feature. What is text block in java ? Introduction Java Text Blocks are available from java 15 as a standard feature, which is a string that starts with three double quotes (“””). Problem…
JUnit provides Assert all to assert all the scenario of a test case. assertAll() is introduced in JUnit 5. It checks all the assertions and reports the individual results of failure or success. Checkout Junit Tutorial here. What is assertall in Junit 5 ? One of the new feature of JUnit 5 assertAll(), it allows…
What is Type Casting Type casting in java refers to converting one data type into others. There are two types, Implicit type casting and explicit type casting, in java. Type casting means we are casting the values from one data type to another. Implicit Type Casting Implicit type casting means casting is done by compiler,…
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Is java dead as of 2023 ? What is Java and its evolution Is java dead as of 2023 ? Java is one of the most popular programming language which is developed in 1995, so it’s been there for around 27 years (as of 2023). Almost around 90% of the Fortune 500 companies uses java….
Rest API Tutorial In this tutorial, we are going to implement rest API example. How to implement restful web services, what is rest client. We will see below topics: what is restful API, Rest API architecture, Methods and resources. What is web service? Web service is a piece of software available over the network/internet and…
Assertions: Assertions in JUnit 5 Assertions are a set of methods present in Junit 5 Assert Class which is used in asserting various conditions in tests. While using assertion, we are going to import this asserts class as static import, and then we will call its methods. JUnit 5 Assertions In Assert JUnit 5 we…