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
mainmethod. - Use
System.out.printandSystem.out.printlnfor 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,elseconstructs. - 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
printfformatting for output precision.
8. printf Statement and Formatting
- Format specifiers:
%sfor strings%cfor characters%dfor integers%ffor floating-point numbers%bfor booleans
- Precision and width formatting (e.g.,
%.2ffor 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.
Category
Educational
