Learning overview
- Estimated time
- 4 minutes
- Difficulty
- Beginner
- Prerequisites
- No prior experience required
- Learning outcome
- Explain java using a clear mental model · Apply java in practical Java work
- Last updated
- July 18, 2026
Definition of Java
Java is a high-level programming language used to write instructions computers can run through the Java Virtual Machine (JVM).
Beginners meet Java through classes, the main method, and System.out.println. Professionals use it for large systems because it emphasizes structure, tooling, and portability.
Tiny Java example
This program defines a class and prints a message when main runs.
public class Hello {
public static void main(String[] args) {
System.out.println("Hello from Java");
}
}Output
Hello from Java
What to remember
Java programs are organized in classes. The JVM runs compiled bytecode, which is why people say write once, run anywhere.
Frequently asked questions
Is Java the same as JavaScript?
No. They are different languages with different jobs. Java is commonly used for applications and backends; JavaScript powers interactive web pages.
Is Java free to learn?
Yes. You can install the JDK and practice with free tools, including Avora Learn lessons and playgrounds.
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