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Students will gain the knowledge to create reusable code blocks in Java through methods. They will learn how to declare and invoke methods, work with parameters and return types, and understand the concept of method overloading.
By the end of this unit, students will be able to write more organized, efficient, and reusable code by effectively using methods in their programs.
Each lesson in this unit follows the same structure:
- Read the concept
- Study the example
- Write or modify Java code
- Compile the program
- Run the code
- Review the output
- Complete a hands-on lab
- Answer review questions
Method declaration and invocation
A method is a named block of code that performs a specific task and can be called from other parts of a program. Students will learn the structure of a method declaration, including the access modifier, return type, method name, and parameter list. They will practice writing methods, calling them from the main method, and understanding how execution flows between method calls.
Method parameters and return types
Parameters allow a method to receive input values when it is called. A return type specifies what kind of value the method sends back to the caller when it finishes. A method with a void return type does not return a value. Students will practice writing methods that accept different types of parameters and return different types of values.
Method overloading
Method overloading allows a class to have multiple methods with the same name as long as their parameter lists are different. Java determines which version of the method to call based on the number and types of arguments provided. Overloading is commonly used to create methods that handle similar tasks for different input types without requiring different names.
Recursion basics
A recursive method is one that calls itself as part of its own execution. Every recursive method needs a base case that stops the recursion and a recursive case that moves toward the base case. Students will practice writing recursive methods for classic problems such as calculating a factorial and computing Fibonacci numbers.
This unit is included in all academic level tracks.
| Academic Level | Track |
|---|---|
| High School | Units 1–7 |
| College / University — Year 1 | Units 1–8 |
| College / University — Year 2 | Units 1–11 |
| College / University — Year 3 | Units 1–13 |
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