What should I learn before core Java or advanced Java?

Before diving into core Java or advanced Java, it's important to have a solid foundation in some fundamental programming concepts:

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• Basic Programming Logic: Understand concepts like variables, data types, conditionals (if-else statements), loops (for, while loops), and basic problem-solving skills. This knowledge is crucial for any programming language.

• Object-Oriented Programming (OOP): Grasp the four main OOP principles - encapsulation, inheritance, polymorphism, and abstraction. This forms the backbone of Java programming.

• Understanding of Data Structures: Familiarize yourself with basic data structures like arrays, linked lists, stacks, queues, and trees. Knowing how to manipulate and work with data efficiently is key to Java programming.

• Basic Algorithms: Learn common algorithms like sorting and searching. This knowledge is essential for writing efficient code.

• Handling Exceptions: Understand how to handle exceptions and errors in Java. This is crucial for writing robust and reliable code.
  
  

• File I/O Operations: Familiarize yourself with reading and writing files in Java.

• Understanding of Threads and Concurrency: Have a basic understanding of how threads work and how to manage concurrent execution in Java.

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Once you're comfortable with these concepts, you can start with core Java, which covers the foundational aspects of the language. After mastering core Java, you can move on to advanced Java, which includes topics like Servlets, JSP, JDBC, and more complex features of the language.