Exercise Program Code List Node Class List Item Public Int D
01exerciseprogram Code List Nodeclass Listitempublic Int Data
Cleaned Assignment Instructions:
Implement a singly linked list class with methods to add data, print the list, and check for membership of an item. The list should be generic to handle objects of any class. Include methods for adding elements, printing the list, and determining whether a specific element exists within the list. Demonstrate the usage of this list class with several object types, such as Person instances, and ensure proper overriding of equals() and toString() methods. Validate the functionality with test classes that add various objects to the list, print contents, and perform membership checks. Handle object comparisons correctly through the equals() method, especially when comparing complex objects like Person instances. Document the implementation details and ensure the list functions correctly with different object types. Use appropriate Java conventions for class design, encapsulation, and generics to produce a robust and flexible linked list implementation.
Paper For Above instruction
Implementing a Generic Singly Linked List in Java for Object Storage
Linked lists are fundamental data structures widely used in computer science for their dynamic memory allocation and efficient insertions and deletions. Creating a versatile, generic linked list class in Java enhances reusability and flexibility, especially when managing diverse object types. This paper explores designing a generic singly linked list, implementing core methods, including addition, listing, and membership checks, and validating these functionalities through comprehensive test cases involving custom object classes such as Person.
Introduction
The need for flexible and type-safe data structures is central to modern programming. Java’s object-oriented design facilitates creating generic collections, but understanding the underlying implementation fosters better control and customization. The singly linked list, composed of nodes that link to subsequent nodes, offers an efficient structure for sequential data access. Implementing a generic version of this list requires defining a node class that holds objects of any type, along with associated list management methods.
Design and Implementation
Node Class
The core element of the list is the node class, typically called ListItem, which contains an Object reference to data and a pointer to the next node. To support generics, the ListItem class should be parameterized with a type variable, allowing compile-time type safety and clarity.
```java
public class ListItem
private T data;
private ListItem
public ListItem(T data) {
this.data = data;
this.next = null;
}
public T getData() {
return data;
}
public ListItem
return next;
}
public void setNext(ListItem
this.next = next;
}
}
```
Linked List Class
The MyLinkedList class manages nodes, providing methods to add data, print the list, and check membership. Use type parameters to allow the list to accept any object type.
```java
public class MyLinkedList
private ListItem
private ListItem
private int numItems = 0;
public void addData(T d) {
ListItem
if (front == null) {
front = newNode;
rear = front;
} else {
rear.setNext(newNode);
rear = newNode;
}
numItems++;
}
public void printList() {
ListItem
System.out.println("List contains " + numItems + " items:");
int i = 1;
while (listPtr != null) {
System.out.println("Item# " + i + ": " + listPtr.getData());
i++;
listPtr = listPtr.getNext();
}
}
public boolean memberOf(T content) {
ListItem
while (listPtr != null) {
if (listPtr.getData().equals(content)) {
return true;
}
listPtr = listPtr.getNext();
}
return false;
}
}
```
Usage with Custom Objects
To demonstrate the list's versatility, create a Person class with appropriate fields, constructors, and methods. Override equals() and toString() for meaningful comparisons and display. For example:
```java
public class Person {
private String name;
private String ssn;
public Person(String name, String ssn) {
this.name = name;
this.ssn = ssn;
}
@Override
public String toString() {
return "Person: name=" + name + ", ssn=" + ssn;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (!(obj instanceof Person)) return false;
Person other = (Person) obj;
return this.name.equals(other.name) && this.ssn.equals(other.ssn);
}
}
```
Test cases instantiate several Person objects, add them to a MyLinkedList
Validation and Testing
In test classes, instantiate the generic list for various data types, add multiple objects, and invoke printList(). Use the memberOf() method to confirm the presence or absence of certain objects. Carefully handle comparisons of complex objects by overriding equals(). For example:
```java
public class TestPersonList {
public static void main(String[] args) {
MyLinkedList
personList.addData(new Person("Alice", "123-45-6789"));
personList.addData(new Person("Bob", "987-65-4321"));
personList.printList();
Person p1 = new Person("Alice", "123-45-6789");
Person p2 = new Person("Charlie", "555-55-5555");
System.out.println("Is Alice in list? " + personList.memberOf(p1));
System.out.println("Is Charlie in list? " + personList.memberOf(p2));
}
}
```
Conclusion
Creating a generic singly linked list in Java enhances code reusability and type safety. By implementing parameterized node and list classes, along with appropriate methods for adding, printing, and membership testing, developers can manage various data types efficiently. Proper overriding of equals() and toString() methods ensures meaningful object comparisons and representations. Thorough testing with different object types confirms the list’s robustness and flexibility.
References
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