Learn Java
from Zero to Expert

public class Main {
    public static void main(String[] args) {
        // Declare variables
        String name = "Java";
        int year = 1995;
        boolean popular = true;
        
        // Print to console
        System.out.println("Learning " + name + "!");
        System.out.println("Released in " + year);
        System.out.println("Popular: " + popular);
    }
}

public class Student {
    // Fields (private for encapsulation)
    private String name;
    private int age;
    private double average;
    
    // Constructor
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
        this.average = 0.0;
    }
    
    // Getter
    public String getName() {
        return name;
    }
    
    // Setter
    public void setAverage(double average) {
        if (average >= 0 && average <= 10) {
            this.average = average;
        }
    }
    
    // Method
    public void displayInfo() {
        System.out.println(name + " (" + age + " years) - Average: " + average);
    }
}

// Usage:
Student s = new Student("John", 20);
s.setAverage(9.5);
s.displayInfo();