Intro to Java Programming - GDG on Campus EUE
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The document is an introduction to programming in Java by Tony Youssef, outlining basics such as coding environments, variable types, and basic operations. It covers the process of compiling Java code, how to handle user input, and common errors in programming. Additionally, it includes a task for creating a number guessing game with hints and resources for further learning.
Intro to Java Programming - GDG on Campus EUE
- 1. Intro to Programming Tony Youssef Java Programming Head, GDG on Campus - EUE
- 3. Who am I?
- 4. Who am I? 1. Tony Youssef 2. I am from the United States 3. I only speak English 4. Level 5 CS student 5. 2+ years experience in Java Email: anthony.youssef23@uol.eue.edu.eg WhatsApp: +1 (541)-841-2992
- 5. Where do we write our code?
- 6. ● Any text editor ● Integrated Development Environment (IDE)
- 7. 1. IntelliJ by JetBrains 2. VSCode by Microsoft 3. Programiz (Website) 1. IntelliJ by JetBrains 2. VSCode by Microsoft Recommended IDEs 1. IntelliJ by JetBrains
- 8. Basic Syntax File name More keywords Your code goes here Keywords
- 9. How do we run it? The simple answer is we can’t. At least not yet.
- 10. What is compiling and how do we do it? 1. Converting our code into machine code (byte code for Java) 1. javac (fileName).java 2. java (fileName) Our Java file The compiled byte code file
- 11. Now let’s do something in our program
- 12. Output
- 13. Variables
- 14. How do we create a variable? 1. (type) (name); 2. (type) (name) = (value);
- 15. int
- 16. Integer values 1. 1, -1, 0, 1,523,696 2. Ranges from -2,147,483,648 to 2,147,483,647
- 17. double
- 18. Decimal values 1. 1.5, 2.0, 3.14159265, -12.34 2. Ranges from -1.79*10308 to 1.79*10308 3. Precise up to 15 digits
- 19. Number operations 1. +, -, *, /, % 2. +=, -=, ++, --
- 20. boolean
- 21. Binary values 1. true or false
- 22. boolean operations 1. <, >, <=, >= 2. ==, !=, ! 3. &&, ||
- 23. char
- 24. Single character 1. ‘a’, ‘1’, ‘ ’, 97 2. You can think of it as a character and a number 3. Uses the American Standard Code for Information Interchange(ASCII) Same value
- 25. String
- 26. String of characters 1. “Hello”, “123”, “”, “W o r l d” 2. Max length of 2,147,483,467 characters
- 27. String operations 1. +, += 2. .equals()
- 28. What should I name my variable?
- 29. Good variable names 1. Should describe the variable 2. camelCase, snake_case, PascalCase 3. Can have numbers, letters, underscores, and dollar signs ($)
- 30. Print more than just “Hello World!”
- 31. How do we get user input? Gives us a wide range of useful tools Create a variable to get user inputs
- 32. ● scan.nextLine(); ● scan.nextInt(); ● scan.nextDouble(); ● scan.nextboolean(); -> String -> int -> double -> boolean
- 33. if statements
- 34. Loops
- 35. for loop while loop
- 36. Arrays
- 37. What is an array? ● An ordered list of values
- 38. What is this error?
- 39. Runtime errors ● ArrayIndexOutOfBoundsException ● InputMisMatchException ● StackOverflowError
- 40. Compile time errors 1. Invalid syntax a. Usually typos
- 41. Logical errors
- 42. Task ● Create a secret 3 digit number and have the user guess what it is. ○ Get the user’s guess until they get it right ○ Have at least 4 hints ○ Print 1 hint if the answer is incorrect ○ Print the hints in order ○ Print a message saying there are no more hints when all of them have been shown ○ You can use the number and hints I came up with ■ 628 ■ “The last digit is even” ■ “The second digit is the smallest” ■ “The first and the second digits add up to the third ■ “All the digits are even”
- 43. More resources ● W3Schools ● GeeksForGeeks ● Oracle (for official Java documentation) ● StackOverflow (for specific questions)