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Homework 2 Answers
1. The Unified Modelling Language (UML) provides a variety of diagrams to model different aspects of a system. Here's a
ief overview of each type:
Class Diagram: Class Diagram is the static structure of a system, including classes, attributes, methods, and relationships between classes (e.g., inheritance, associations).
Example: School class with attributes like name and address, and a teacher class inheriting from School.
Object Diagram: Shows instances of classes at a particular moment in time, focusing on the relationships between objects rather than the classes themselves.
Example: Teachers object with specific values for name and age, linked to an Address object.
Use Case Diagram: Illustrates the functional requirements of a system, depicting actors (users or other systems) and their interactions with the system's use cases.
Example: Teachers interacting with use cases like Preparing Exams Paper and Preparing Report Cards.
Sequence Diagram: Represents the order of messages exchanged between objects or components over time, showing interactions in a sequence.
Example: The sequence of messages between a School Management, Principal, and Teachers during an
Student’s admissions procedure.
State Diagram: Models the different states of an object and transitions between those states in response to events.
Example: Shows state of Student object that admission is pending, confirmed
Component Diagram: Represents the organization and dependencies among software components or modules in a system.
Example: A diagram showing components like User Interface, Business Logic, and Database, with dependencies indicating interactions between them.
Deployment Diagram: Shows the physical deployment of artifacts (software components) on hardware nodes, illustrating how software is distributed across hardware.
Example: A diagram depicting a Server node hosting a Web Application component and a Database node hosting a Database component.
Package Diagram: Organizes related classes or components into packages, showing how they are grouped and their dependencies.
Example: A diagram grouping User, Order, and Product classes into a Shopping package with dependencies to an authentication package.
Composite Structure Diagram: Details the internal structure of a class or component, showing how its parts interact.
Example: A diagram detailing the internal structure of a Li
ary component, with parts like Catalogue, Member, and Loan Management.
Here's a simple example of a UML Class Diagram:
     Student
    · studentID: int
     + register()
     Person
    · name: string
· age: int
     + getName()
+ getAge()



     Teache
    · employeeID: int
     + teach()
2. To get the output as mentioned using the toString() methods in H2ClassA and H2ClassB, we have to ove
ide the toString() method in both classes. When System.out.println(y) is called, the output format is co
ect and uses the toString() method of H2ClassB.
H2ClassB: Implement the toString() method to return the integer value of x as a string, allows each object to represented by its integer value.
H2ClassA: Implement the toString() method to iterate over the A
ayList of H2ClassB objects, collect their string representations, and format them as a space-separated string using StringBuilder.
Here is new code
import java.util.A
ayList;
public class H2ClassA {
A
ayList list = new A
ayList();
public static void main(String args[]) {
H2ClassA y = new H2ClassA();
int[] v = {4, 3, 7, 5, 99, 3};
for (int m : v)
y.list.add(new H2ClassB(m));
System.out.println(y);
}
end main

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