60 Days of Java : The Complete Java Masterclass

Declare and initialize an int in Java, assigning values like 36 or 74, and explore memory slots, equals sign usage, camel case versus snake case, and standard naming conventions.

this lecture covers the float and double data types, 32-bit vs 64-bit precision, why an f suffix is needed, and how incompatible types, lossy conversions, pi, and temperature arise.

Learn how strings store text with string literals in quotes, and how variables reuse those values, for example a greeting that prints Hello Java.

Learn how the modulo operator (percent sign) returns the remainder of integer division in Java, with examples using 5 and 8.

Master relational operators in Java by comparing values with equals, not equals, greater than, less than, and their inclusive counterparts, using booleans to drive if-like logic.

Learn how the string class equals method compares the value of variables rather than memory addresses, and how equalsIgnoreCase handles case-insensitive comparisons in Java.

Explore how the string class compareTo performs lexicographic comparisons between two strings, returning negative, zero, or positive values to reflect alphabetical order, shown with cat and dog examples.

Discover how to use the substring method to extract parts of a string with start and end indices, illustrated by programming in Java and handling index out of bounds errors.

Learn how to manipulate strings in Java using the replace method to swap characters and apply toUpperCase and toLowerCase, including examples with the phrase 'the quick brown fox'.

Install the Java development kit and an integrated development environment to write, compile, and run Java code, and explore key IDE features like syntax highlighting and code completion.

Install the JDK on Windows, set the java home environment variable, and verify with java -version to confirm Java 22 is installed.

Experience auto completion in IntelliJ as you type system.out.println, then learn to close the project from the hamburger menu to start or open a new project.

Create a new Java project in IntelliJ, build a magic potion calculator with a main method, compute potion power from magic essence, dragon scales, unicorn hair, and print it.

Create a budget tracker app in Java that prompts for income, rent, groceries, transportation, and entertainment, computes total expenses and percentages, and prints a formatted budget breakdown with remaining budget.

Master control statements by exploring if statements, if else if, nested ifs, and ternary operators, using logical operators to refine conditions and complete the Galaxy Weather Advisor exercise.

Explore nested if statements by checking a > 0, then b > a, and printing 'b is greater than a' when both conditions hold.

discover how the default case in a switch works, why a break is kept for readability, and how the default block executes when none of the cases match.

Learn how to use switch statements with the char data type in Java, handling cases A–F and a default, and print results such as excellent or good job.

Enums define accepted values to make code safer and easier to maintain, using coffee sizes and external day or month enums to simplify switch statements.

Discover how loops in Java execute code repeatedly, covering for loop, while loop, and do while loop, with initialization, condition, and update. See how loops reduce redundancy and boost readability.

Explore nested for loops with an outer and inner loop, using i and j to generate row and column patterns. See how printing affects output and build row-column values.

Build a pyramid with for loops by entering the number of levels, then print leading spaces and two times the row index minus one stars per row to shape it.

Explore how the do while loop executes its body at least once, then repeats while the condition holds, using do { ... } while (condition); compare with while and for.

Learn how to use the break keyword to exit the current loop—for, while, and do-while—and even switch statements, with real-world file scanning examples.

Master Java loops, including for, while, and do while, using break, continue, and labels to control execution while building a pyramid and a calculator and then exploring arrays.

Learn to iterate through arrays in Java with a for loop, using array length to prevent errors, accessing items by index, and using the enhanced for loop for cleaner iteration.

Learn to rearrange an even-length array by interleaving the first half with the second half using a simple for loop, producing a rearranged array like 235417.

Explore core array utilities in Java by using Arrays.toString to display arrays and Arrays.sort to order numeric and string arrays, with practical examples of pre- and post-sorting outputs.

Learn why array copy is important, distinguish by reference vs by value, and use copyOf to create a true backup of an array, controlling length and padding with zeros.

Explore 2D arrays by declaring, initializing, and iterating through a grid, find the largest element and sum all values, and introduce arraylists for a space travel simulator project.

Learn how to declare, initialize, and iterate a 2d array in Java, including setting values, using nested loops, and accessing rows and columns with array.length.

Learn how to initialize a 2D array directly with nested braces, create rows with varying column counts, and use array.length to safely iterate rows and columns without index errors.

Learn to iterate a 2d array using enhanced for loops and IDE tips for clearer code. Test changes to ensure the program still runs.

Learn to compute the sum of all items in a two-dimensional array using nested enhanced for loops, a running sum variable, and a simple arithmetic check to verify the result.