Java Tutorial for Python Programmers

Java Files and Classes

Unlike Python, Java can't have a file with just a single print statement. Instead, each file must contain a class with the same name as the file. For example, the following could be the code inside CodeToRun.java:

public class CodeToRun {
    
    //code inside the class. (This is a comment.)
    
}
        

Java class names should always be given in PascalCase, just like in Python. Variable names, however, should be in camelCase instead of snake_case. The difference between camelCase and PascalCase is only that the first letter is always lower case in camelCase.

Use What You Learned

Create a new file, Monkey.java with the class declaration inside.

Tutorial Table of Contents

1. Intro
2. Java Files and Classes
3. Running Java Code
4. Statements and Printing
5. Comments
6. Types and Variables
7. Conditionals
8. Static Methods
9. Strings
10. Loops
11. Arrays
12. ArrayLists
13. Classes
14. Subclasses
15. Generic Types
16. Javadoc
17. Final Exam
18. What's Next?