What key points should be focused on before an interview?

Before a Java interview, focus on the following key points:

• Language fundamentals: syntax, data types, control flow.
• Object-oriented programming: classes, inheritance, polymorphism, encapsulation.
• Java collections: List, Set, Map, their features and when to use them.
• Exception handling: try-catch, creating custom exceptions.
• Multithreading: thread basics, synchronization, volatile, ThreadPool.
• Memory management: understanding Garbage Collector, strong and weak references.
• Java 8+ basics: lambda expressions, Stream API.
• Practical skills: writing clean code, understanding design patterns.

It is also recommended to prepare code examples and be ready to explain solutions to algorithm and data structure problems.