Make a Linked List in Java Declare a class named User that contains the followin

Question

Make a Linked List in Java Declare a class named User that contains the following information: String Name String username String password Include in the class a single constructor that is passed a particular first and last name,username,and password; setters and getters, and a toString method that returns the information ia given User object as follows:"Ashley Smith" username: asmith password:"aWjPP406!" Declare a class named UserNode that contains a single User object and a link to another UserNode. Include an appropriate constructor and an appropriate set of methods for this class. 2. Create a class named UserAccounts that maintains a list of user accounts, with an appropriate constructor, and the following methods: isEmpty() returns true if list is empty, and false otherwise findPassword–returns the password for a given user name changePassword–updates the password for a given user name and password. If they do not match, the password is not updated. addUser – passed a User object to add deleteUser – deletes a user for a given user name and pass word. If they do not match, the user is not deleted. printUsers–prints a list of all user names, username and password

Explanation / Answer

1)

Java code creates two classes, User and UserNode.

User.java:

//Declare a class named User
class User
{
   //Declare variables
String Name;
String username;
String password;
User next;

//single constructor that is passed a particular
//name,username,and password; setters and getters,
//and a toString method
public User(String firstLastName, String uName, String pwd)
{
this.Name = firstLastName;
this.username = uName;
this.password = pwd;
next = null;
}
  
public String getNameValue()
{
return Name;
}

public void setName(String name)
{
this.Name = name;
}
  
public String getUsername() {
return username;
}

public void setUsername(String name) {
this.username = name;
}
  
public String getPassword() {
return password;
}

public void setPassword(String pwd) {
this.password = pwd;
}
public String toString()
{
return Name;
}

}

UserNode.java:

//Declare a class named UserNode that
//contains a single User object and
//a link to another UserNode
public class UserNode
{
   private User head = null;

   public void append(String name, String username, String pwd )
   {
   User nodeUser = getLastNodeUser();
   if (nodeUser == null)
   {
   head = new User(name, username, pwd);
   } else
   {
   nodeUser.next = new User(name, username, pwd);
   }
   }

   public void delete(String name, String username, String pwd)
   {
   if(head == null)
   {
   return;
   }

   User firstUser = null;
   User presentUser = head;
   while (presentUser != null && presentUser.Name != name && presentUser.username != username && presentUser.password != pwd) {
   firstUser = presentUser;
   presentUser = presentUser.next;
   }
   if(firstUser == null){
   head = head.next;
   return;
   }
   if (presentUser == null) {
   System.out.println("User not have here.");
   return;
   }
   firstUser.next = presentUser.next;
   }

   public void print() {
   System.out.println("");
   if(head == null){
   System.out.print("empty list");
   return;
   }
   User alternateUser = head;
   while (alternateUser != null)
   {
   System.out.print(alternateUser.Name + " -> ");
   System.out.print(alternateUser.Name + " -> ");
   System.out.print(alternateUser.username + " -> ");
   alternateUser = alternateUser.next;
   }
   }

   private User getLastNodeUser() {
   if (head == null) {
   return null;
   }
   User alternateUser = head;
   while (alternateUser.next != null) {
   alternateUser = alternateUser.next;
   }
   return alternateUser;
   }

   public static void main(String[] args)
   {
   UserNode listNodeUser = new UserNode();
   // User object as follows:"Ashley Smith"
   //username: asmith password:"aWjPP406!"
   listNodeUser.append("Ashley Smith", "asmith", "aWjPP406!");
   listNodeUser.print();
   listNodeUser.delete("Ashley Smith", "asmith", "aWjPP406!");
   }
   }

Output:

Ashley Smith -> Ashley Smith -> asmith ->

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.