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
Program shape
A common beginner console program uses one public class and a main method.
public class App {
public static void main(String[] args) {
System.out.println("Running");
}
}Output
Running
Variables and decisions
Declare a type, choose a clear name, then branch with if/else when needed.
int score = 42;
if (score >= 40) {
System.out.println("Pass");
} else {
System.out.println("Try again");
}Output
Pass
Loops and methods
Use for when you know the count. Extract repeated logic into methods.
for (int i = 1; i <= 3; i++) {
System.out.println("Step " + i);
}Output
Step 1 Step 2 Step 3
Frequently asked questions
Must the file name match the public class?
Yes for a public class: Hello.java should contain public class Hello.
What does System.out.println do?
It prints a line of text to the console and then moves to the next line.
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