Ch 13 · Mini-Projects & Practice · Java

Topic 13 of 13 in Java — Complete Tutorial (Beginner) — 5 lessons.

Simple Calculator

This project builds a calculate method that takes two numbers and an operator, then performs the right operation using a switch. It handles division by zero safely. It shows methods, switch, and returning values.

Grade Reporter

This project uses a Student class and methods to compute an average and grade, then prints a formatted report. It brings together classes, arrays, loops, methods, and String.format — nearly every concept in this tutorial.

Number Guessing Game

This project implements the core logic of a guessing game — it processes a list of guesses in a loop using a method, conditionals, and break. In a real interactive version the guesses would come from user input, but the logic is identical.

Practice Exercises

Now You Try!

Try to practice by writing your own code. Reading code teaches you a little — *writing* it teaches you a lot! Open the playground beside this card, pick one of these mini-challenges, and build it from scratch:

All topics in Java Beginner

1. Introduction to Programming & Java
2. Your First Java Program
3. Variables — Your Data Containers
4. Data Types — Kinds of Values
5. Operators & Expressions
6. Conditional Statements
7. Loops & Iterations
8. Methods
9. Arrays & Lists
10. Objects & Classes
11. Strings — Working with Text
12. Exception Handling
13. Mini-Projects & Practice