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An important concept in Java is OOP, which stands for object-oriented programming. Java is an OOP language, which means that it emphasizes data more than it does functions.
OOP programming languages revolve around objects. This object bundles up data and the methods that operate on this data in one unit.
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The most important concepts, in sequence, are :-
1. Class elements ( Variables, Methods, Constructor, Instance-block, Static-block)
2. Oops (A-PIE : Abstraction, Polymorphism, Inheritance, Encapsulation )
3. Access modifiers ( public, private, protected, default )
4. final and static keyword ( at variable, method and class level )
5. String Manipulation ( String.class, StringBufffer.class, StringBuilder.class)
6. Interface ( with use of abstract keyword and strategy design pattern )
Advance topics
1. Exception Handling ( throw vs thowss, try-catch-finally, custom exceptions )
2. Multithreading ( synchornized method and block, Lock, Latch, Barrier, Semaphore, thread states, thread creation using lamda, CompletableFutures, Executors )
3. Collection (List, Set, Map, Comparable, Comparator, Iterator )
4. Streams
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