Java Fundamentals · Variables & Data Types · Lesson 5 of 22
Primitive Types vs Objects
Concept
Primitive Types vs Objects
Types like int and boolean are primitives that hold raw values directly. String and other capitalized types are objects, with their own built-in methods.
By the end of this lesson
- Explain the core idea behind Primitive Types vs Objects.
- 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
String name = "Alex";
System.out.println(name.length());
System.out.println(name.toUpperCase());Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Primitive Types vs Objects. 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
Call two different String methods on a variable holding your name.
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Console