Java Fundamentals · Final Project · Lesson 21 of 22
Planning a Java Program
Concept
Planning a Java Program
Sketch what data your program needs — variables, an array, or a class — and which methods you will write before coding.
By the end of this lesson
- Explain the core idea behind Planning a Java Program.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
ExampleRunnable
// Project: Grade calculator
// class Student { name, int[] scores }
// method average(Student s)Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Planning a Java Program. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Write a plan, as comments, for a small Java project of your choice.
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Console