Java Fundamentals · Variables & Data Types · Lesson 6 of 22
Type Casting
Concept
Type Casting
Casting converts a value from one type to another, such as an int to a double, using parentheses around the target type.
By the end of this lesson
- Explain the core idea behind Type Casting.
- 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
int a = 7;
int b = 2;
double result = (double) a / b;
System.out.println(result);Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Type Casting. 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
Cast an int to a double before dividing it by another int to get a decimal result.
Loading editor…
Console