Java Tutorial: Lexical tokens in java

Learn about the building blocks of Java programs: Lexical Tokens. This video covers the basics of lexical tokens and how they're used in Java. You'll learn about different types of tokens like keywords, identifiers, literals, and symbols and how they work together to create Java programs. Whether you're a beginner or an experienced Java developer, this video will help you gain a deeper understanding of Java syntax and how it's used to write programs.

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content of this video:
00:00 Introduction
00:07 Agenda
00:27 What is Lexical token in java?
02:34 Identifiers in java
09:08 Keywords in java
11:52 Separators in java
13:30 Operators in java
14:00 Literals in java
15:32 Whitespaces in java
17:52 Comments in java
21:56 End

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🎯 Key Takeaways for quick navigation:

00:00 📖 Lexical tokens in Java are fundamental elements in the source code.
00:24 💻 Source code is just text for the computer, and the compiler processes it into tokens.
01:16 🧩 Tokens are organized into a hierarchical structure, leading to the compilation of source code into bytecode.
02:11 🆔 Identifiers are names for packages, classes, methods, variables, etc., with specific naming rules.
03:37 🚫 Invalid identifier rules include using reserved keywords, special characters (except underscores), and starting with a digit.
06:16 ✅ Valid identifier rules allow for unlimited length, letters (uppercase and lowercase), digits (not at the start), underscores, and currency symbols.
09:29 🗝️ Keywords in Java are reserved words, mostly in lowercase, used for predefined purposes.
13:56 ➕ Operators in Java perform specific operations on operands, including assignment, arithmetic, relational, and logical operations.
14:23 💡 Literals are fixed values that don't require further calculation, such as numbers assigned to variables.
15:47 ⌨️ White spaces in Java source code help format and improve readability; they are sometimes used as separators.
20:18 📝 Comments in Java include single-line, multi-line, and documentation comments, which are ignored by the compiler and used for documentation.