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
What you will build and learn
You will build a StudentGradeApp that stores three scores, computes an average, and prints a result message. Keep calculation separate from printing so each part stays testable.
- Use a class with a main method
- Store scores in variables or an array
- Write a method that returns the average
- Use if/else for the pass decision
Step 1: Create the program skeleton
Every beginner Java program needs a class and a main method. main is the starting door when you press Run.
public class StudentGradeApp {
public static void main(String[] args) {
System.out.println("Grade calculator ready");
}
}Output
Grade calculator ready
Step 2: Calculate the average in a method
Methods package reusable steps. Returning a value keeps math separate from display.
public static double average(int a, int b, int c) {
return (a + b + c) / 3.0;
}Step 3: Decide Pass or Needs practice
After you have an average, use if/else to choose a message. Then extend the project with more subjects or letter grades.
Frequently asked questions
Why divide by 3.0 instead of 3?
Using 3.0 keeps the result as a decimal average. Dividing only ints can truncate the fractional part.
Where should beginners place main?
Inside a public class that matches the file name, as public static void main(String[] args).
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