Java Learning Codes

Beginner-friendly Java programs, starting from the basics.

Basic Programs

1. HelloWorld.java — print a message
2. Variables.java — declare and display variables
3. UserInput.java — read input with Scanner
4. EvenOdd.java — check whether a number is even or odd
5. AgeCheckForVote.java — check voting eligibility by age
6. MultiplicationTable.java — print a multiplication table using a method
7. PositiveNegativeZero.java — classify a number using conditions
8. Calculator.java — perform arithmetic on two user-entered numbers
9. FahrenheitToCelsius.java — convert Fahrenheit to Celsius
10. StudentInfo.java — display student information
11. StudentGradeCalculator.java — calculate total, percentage, grade, and pass/fail result
12. ClassAndObjectDemo.java — demonstrate a class and two objects
13. ArrayAverage.java — calculate the average of numbers stored in an array

Run a Program

javac basic/HelloWorld.java
java -cp basic HelloWorld

To run the grade calculator:

javac basic/StudentGradeCalculator.java
java -cp basic StudentGradeCalculator

Each file contains one public class. The filename and class name must match.