Summary of Java Full Course for free ☕ (2025)

Summary of "Java Full Course for free ☕ (2025)"

1. Introduction to Java

• Setup requirements:
  • Install JDK (Java Development Kit) from Oracle.
  • Install an IDE (IntelliJ IDEA Community Edition recommended).
• Create a new Java project and main class.
• Write and run your first Java program with a main method.
• Use System.out.print and System.out.println for console output.
• Use comments (// for single line, /* */ for multi-line).
• IntelliJ shortcuts (e.g., sout + Tab for print statement).

2. Variables and Data Types

• Variables are containers for values.
• Primitive data types:
  • int (whole numbers)
  • double (decimal numbers)
  • char (single characters, enclosed in single quotes)
  • boolean (true or false)
• Reference data types:
  • String (sequence of characters, enclosed in double quotes)
• Declaration and assignment explained.
• Naming conventions: camelCase.
• String concatenation with +.
• Boolean usage and simple if-statement example.

3. User Input with Scanner

• Import java.util.Scanner.
• Create a Scanner object to read input from the console.
• Methods:
  • nextLine() for strings with spaces.
  • next() for strings without spaces.
  • nextInt() for integers.
  • nextDouble() for doubles.
  • nextBoolean() for booleans.
• Handle input buffer issues (clearing new line after numeric input).
• Exercises:
  • Calculate area of rectangle with user input.
  • Mad Libs game using multiple user inputs.

4. Operators and Expressions

• Arithmetic operators: +, -, *, /, % (modulus).
• Augmented assignment operators: +=, -=, *=, /=, %= for shorthand.
• Increment (++) and decrement (--) operators.
• Order of operations (PEMDAS).
• Example: simple shopping cart program using user input and arithmetic.

5. Control Flow: If Statements

• Basic if, else if, else constructs.
• Comparison operators: ==, !=, <, >, <=, >=.
• Logical operators: && (and), || (or), ! (not).
• Nested if statements.
• Using booleans in conditions.
• Example: age categorization, student status, name input validation.

6. Random Numbers

• Import java.util.Random.
• Create Random object.
• Generate Random integers within bounds (nextInt(bound)).
• Generate Random doubles (nextDouble()).
• Generate Random booleans (nextBoolean()).
• Example: dice roll simulation.

7. Math Class Utilities

• Constants: Math.PI, Math.E.
• Methods:
  • Math.pow(), Math.abs(), Math.sqrt()
  • Math.round(), Math.ceil(), Math.floor()
  • Math.max(), Math.min()
• Exercises:
  • Calculate hypotenuse of a right triangle.
  • Calculate circumference, area, and volume of circle/sphere.
• Introduction to printf formatting for output precision.

8. printf Statement and Formatting

• Format specifiers:
  • %s for strings
  • %c for characters
  • %d for integers
  • %f for floating-point numbers
  • %b for booleans
• Precision and width formatting (e.g., %.2f for 2 decimal places).
• Flags for padding, signs, and alignment.
• Examples with various data types and formatted output.

9. Projects

• Compound Interest Calculator: user inputs principal, rate, times compounded, years; calculates final amount.
• Shopping Cart: user inputs item, price, quantity; calculates total.
• Mad Libs Game: user inputs adjectives, nouns, verbs to fill in a silly story.
• Dice Rolling Simulator: user inputs number of dice; outputs dice rolls with ASCII art.
• Number Guessing Game: Random number generated; user guesses until correct; counts attempts.
• Rock Paper Scissors Game: user vs computer with input validation and replay option.
• Slot Machine Game: user bets, Random emojis generated, payout calculated.
• Banking Program: deposit, withdraw, show balance with input validation.
• Temperature and Weight Conversion Programs using ternary operators.
• Calculator Program using enhanced switch statements.
• Hangman Game: user guesses letters, ASCII hangman displayed.

Notable Quotes

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