Introduction to Computer Science & Java: Lesson 1.2 — Java File Structure

Classes • Methods • main() Method • Compiling & Running Java Programs

This printable worksheet packet (with full Teacher Guide included) introduces students to the essential structure of a Java program. Perfect for 9th–12th grade Computer Science classes, AP CSA, or any Java fundamentals unit. Students learn how Java files are organized, how methods work, why the main() method is required, and how Java programs are compiled and run. Includes guided practice, code tracing, vocabulary, and a JDoodle-based coding activity.

⭐ What’s IncludedStudent Worksheet (Printable 8.5×11)

• Engaging title page
  
• Mini-lesson on classes, methods, and the main() method
  
• Easy-to-understand examples and syntax breakdowns
  
• Vocabulary section with fill-in-the-blank terms
  
• Guided practice questions (short answer + predict-the-output)
  
• Code tracing exercises
  
• JDoodle coding activity with starter code
  
• “Level Up” extension challenge
  
• Exit ticket reflection prompts
  

Teacher Guide

• Lesson overview and learning objectives
  
• Standards alignment (AP CSA + CSTA)
  
• Materials list & prep instructions
  
• Step-by-step teaching script for introducing concepts
  
• Common misconceptions to address
  
• Answer key for every section
  
• Example outputs and complete sample code
  
• Differentiation ideas for advanced and struggling learners
  
• Optional homework + quick quiz questions
  

🎯 Learning Goals

Students will be able to:

• Identify the required parts of a Java program
  
• Explain the role of classes, methods, and the main() method
  
• Understand the compile → run workflow
  
• Trace and predict the output of simple Java programs
  
• Write and call their own methods in JDoodle
  

✨ Perfect For

• AP Computer Science A
  
• CSA Java levels 1–2
  
• Intro to Programming
  
• High school computer science courses
  
• Substitute plans or independent practice
  
• Your “Introduction to Computer Science & Java” unit sequence
  

📌 File Format

• Fully editable DOCX
  
• Classroom-friendly visuals
  
• Printer-ready 8.5×11 layout