Java Fundamentals · Getting Started · Lesson 2 of 22
Compiling and Running Java
Concept
Compiling and Running Java
Java source files compile to bytecode with javac, then run on the Java Virtual Machine (JVM) with the java command — which is how the same compiled program can run on any device with a JVM installed.
- Explain the core idea behind Compiling and Running Java.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Compiling and Running Java. 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
Explain, in a comment, the difference between compiling and running a Java program.
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
Console