Java Key Key Question

Classloader

• What is ClassLoader?
• Bootstrap ClassLoader in Java
• Extension ClassLoader in Java
• Application/System ClassLoader

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Collection

• Fail-Safe and Fail-Fast in Java

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Solid Principles

• SOLID Principles

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Garbage Collector

• G1 Garbage Collector
• Garbage Collector
• Heap vs Stack Memory in Java
• What is HashMap

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Java Versions

• Java 8
• Java 9 to 22
• Java Versions List
• What is New in Java 17 After Java 18
• Lambda Expressions

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Random

• Immutable Class in Java
• Immutable Nature of Java Strings
• Java Generics
• Java Streams

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Threads

• Parallelism and Concurrency
• What is Daemon Thread?
• What is Thread Priority?
• Atomic, Volatile, and Synchronized
• What is Race Condition in Java
• Single Thread Executor
• Different Thread Pools in Java Executor Service
• ExecutorService
• Is Virtual Threads Similar to Promise in JavaScript?
• Java Multithreading
• ThreadLocal and InheritableThreadLocal in Java Multithreading
• Virtual Threads in Java 21
• What is NewCachedThreadPool?

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Miscellaneous

• Why Field Injection is Not Recommended
• What is Wrapper Class and Why We Need Them?

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This organization makes it easy to navigate by topic. Let me know if you need more information!