Mastering Java + Spring Boot: REST APIs and Microservices

Begin by exploring core Java and Java SE fundamentals, including environment setup, syntax, and basic constructs. Build a solid foundation in object oriented programming, collections, streams, exception handling, and multithreading.

Learn to set up a Java development environment, write and save your first Java program, compile with javac, and run with java, and understand editors, IDEs, and the main method.

Explore how to write the first Java program, including public class, the main method, static and void, braces, arrays, and printing with System.out.println.

Master command line arguments in Java using the main method and string[] args; read, parse integers, and print results with System.out.println.

Master the basic programming constructs of Java, including data types, identifiers, keywords, operators, control statements, loops, and jump statements.

Explore java's 16-bit charset and unicode foundation, revealing 65,536 possible characters. Compare ascii's 128-character subset and how unicode preserves ascii, enabling java programs across languages.

Learn how identifiers shape Java programs by studying variables, constants, keywords, and primitive data types; apply final for constants and follow naming rules for reliable, strongly typed memory management.

Explore the eight primitive data types in Java, including byte, short, int, long, float, double, char, and boolean, with attention to ranges, default values and default types, and type casting.

Explore Java operators, including unary, binary, and ternary forms, and learn arithmetic, relational, bitwise, and logical operators, with operands, assignment, precedence, and associativity rules.

Explore arithmetic, relational, and assignment operators in Java, including precedence, associativity, and binary versus unary forms. Understand division and modulus behavior, division by zero risks, and floating-point infinities and NaN.

Explore logical and bitwise operators in java, including and, or, not, left and right shifts, and unsigned right shift, with boolean results and binary bit operations.

Master Java control statements, including if and switch selections, while, do-while, and for loops, and break, continue, and return jumps. Learn nesting, else-if ladders, and for each usage in collections.

Learn how else-if ladder extends two-way if statements to handle many conditions in Java, with a grade-by-marks example using ranges for A+, A, B, C, D, and fail.

Demonstrates the switch statement, a multi-way control construct in Java that evaluates an expression against case labels, which must be literals, uses breaks to avoid fall-through, and handles default cases.

Explore while and do-while loops in Java, learning initialization, test conditions, and updates; compare entry and exit control loops and apply to menu driven programs and prime number examples.

Learn how break exits loops and switches, continue skips loop iterations, and return exits methods or returns values, with Java examples from loops, prime checks, and method design.

Learn the fundamentals of Java arrays: declare, define, initialize, and read/write with fixed, zero-based indexing. Explore contiguously allocated, homogeneous data, length, and random access.

Master arrays in Java by populating, printing, and computing sum and average; find min and max, search elements, and sort using Arrays utilities, with practical, example-driven explanations.

Explore arrays of arrays in Java, covering 2d, 3d, and n dimensional structures, and learn to declare, initialize, define, populate, and print them as matrices.

Explore methods in Java, defining self-contained blocks of code with return types or void, calling methods with actual and formal parameters, and using varargs for flexible inputs.

Explore the object oriented paradigm by defining objects and classes, and applying encapsulation, inheritance, polymorphism, and abstraction to solve complex problems in Java.

Explore how Java uses classes as blueprints for objects and distinguishes instance and static data. Trace how methods manipulate data, and review memory areas like heap, stack, and class area.

Explore how a class defines properties while objects hold state, behavior, and identity in Java. Learn object creation with new and constructors, heap memory, stack frames, and garbage collection.

Master constructors in Java, including default and parameterized forms; learn constructor overloading to initialize objects at creation, and understand no return type yet returning the class type.

Discover how the this keyword references the current object to resolve shadowing between instance members and local variables, enable constructor calls, and support constructor overloading.

Explore the static keyword in Java: use static variables shared by a class, accessed via the class name, with static blocks and static nested classes, and understand static method constraints.