Student.java

public class Student {
    int rollNo;
    String name;
    double marks;

    public void displayDetails() {
        System.out.println("--- Student Details ---");
        System.out.println("Roll No : " + rollNo);
        System.out.println("Name    : " + name);
        System.out.println("Marks   : " + marks);
    }

    public void displayNameFormats() {
        System.out.println("\n--- Name Formatting ---");
        System.out.println("Original  : " + name);
        System.out.println("Uppercase : " + name.toUpperCase());
        System.out.println("Lowercase : " + name.toLowerCase());
        System.out.println("Length    : " + name.length());
    }
}