What is OOP and what are its main principles?, What is the difference between Association, Aggregation, and Composition?, What primitive data types exist in Java?, Why is char considered less relevant in modern Java?, What is the difference between UTF-8, UTF-16, and Unicode?, What is the difference between an Object and a Primitive?, What is bytecode and what is the main() method?, What is type casting (Upcasting and Downcasting)?, What is the difference between Static and Dynamic Polymorphism?, What constructor types exist in Java?, Which classes are Immutable in Java?, What is the difference between an Abstract Class and an Interface?, How does the final keyword work?, What is the execution order of initialization blocks and constructors?, Why is String immutable and what does intern() do?, What is the difference between Heap, Stack, and Metaspace?, How does Garbage Collection work (Young vs Old Generation)?, Where are primitive variables stored in memory?, Is Java pass-by-value or pass-by-reference?, What is the difference between String, StringBuilder, and StringBuffer?
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