public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, Java!");
        
        String name = "Alice";
        int age = 25;
        double salary = 75000.50;
        boolean isEmployed = true;
        
        System.out.printf("%s is %d years old%n", name, age);
        
        // Type conversion
        int x = 10;
        double y = x; // implicit
        double z = 3.14;
        int w = (int) z; // explicit
    }
}