Core Java Tutorials by Noel Kamphoa

How to Fix UnfinishedStubbingException In Java

Learn what causes UnfinishedStubbingException in Java, how to identify improper mock usage, and best practices to avoid this Mockito error.

Learn about the causes of InvalidUseOfMatchersException in Java, common mistakes with Mockito matchers, and how to fix them effectively

Disable wildcard imports in IntelliJ for cleaner code by adjusting import settings to show explicit classes.

Explore Java's sealed classes and interfaces, their uses, and how they enhance control over subclassing and improve code safety.

Learn how to use Java Records to simplify data modeling with immutable data, automatic method generation, and concise syntax in your apps.

Learn about ClassCastException in Java, common scenarios that trigger it, and best practices to avoid this runtime error in your code

Explore how Java's BigDecimal Class ensures precise calculations, avoiding pitfalls of floating-point arithmetic in various applications.

Learn how to handle NumberFormatException in Java. This guide covers common causes, examples, and best practices for robust number parsing

Learn how to fix ConcurrentModificationException in Java with practical tips and best practices to handle concurrent modifications.

Understand how to avoid and handle DateTimeException in Java. This guide provides best practices, common causes, and code examples.