编译和运行 Java 代码时如何修复「类未找到」错误

# Introduction

When working with Java, one of the most common frustrations for developers is encountering the 'class not found' error. This error occurs when the Java Virtual Machine (JVM) cannot locate a class that your program needs to run. Whether you are a beginner or have some experience with Java, understanding how to diagnose and resolve this error is essential for smooth development.

In this lab, you will learn what causes the 'class not found' error, how to identify the specific issue in your code, and implement effective solutions to fix it. By the end of this session, you will have the knowledge and practical experience to overcome this common obstacle in Java programming.