why will it not display all of the entries-- output -nMenu n-Add Entr.pdf

why will it not display all of the entries??
output
/nMenu
n.Add Entry
d. Delete Entry
u. Update Entry
l. Search
a. View All
q. Exit
/nMenu
n.Add Entry
d. Delete Entry
u. Update Entry
l. Search
a. View All
q. Exit
n
Enter a name: carnea
Enter an address: 30 carrollton
New Contact has been added,
/nMenu
n.Add Entry
d. Delete Entry

u. Update Entry
l. Search
a. View All
q. Exit
n
Enter a name: Tesia
Enter an address: 1010 hancover
New Contact has been added,
/nMenu
n.Add Entry
d. Delete Entry
u. Update Entry
l. Search
a. View All
q. Exit
n.Add Entry
d. Delete Entry
u. Update Entry
l. Search
a. View All
q. Exit
a
All entries:

carnea:30 carrollton
THE CODE:
import java.util.Scanner;
public class AddressBook {
public static void main(String[] args) {
Tablea addressBook = new Tablea();
Scanner scanner = new Scanner(System.in);
String name, address;
String action = null;
boolean moreEntries = true;
while (moreEntries) {
System.out.println("/nMenu");
System.out.println("n.Add Entry");
System.out.println("d. Delete Entry");
System.out.println("u. Update Entry");
System.out.println("l. Search");
System.out.println("a. View All");
System.out.println("q. Exit");
action = scanner.nextLine();
// Insert a new entry into the address book
switch (action) {
case "n":
System.out.print("Enter a name: ");
name = scanner.nextLine();
System.out.print("Enter an address: ");
address = scanner.nextLine();
addressBook.insert(name, address);
System.out.println("New Contact has been added,");
break;
// Delete an entry from the address book
case "d":

System.out.println("Enter a name to delete: ");
boolean deleted = addressBook.delete(name);
if (deleted) {
System.out.println("Address deleted");
} else {
System.out.println("Name not found");
}
break;
// Update an entry in the address book
case "u":
System.out.print("Enter a name to update: ");
System.out.print("Enter a new address: ");
address = scanner.nextLine();
boolean updated = addressBook.update(name, address);
if (updated) {
System.out.println("Address updated");
} else {
}
break;
// Lookup an entry in the address book
case "l":
System.out.print("Enter a name to look up: ");
String result = addressBook.lookUp(name);
if (result != null) {
System.out.println("Address: " + result);
} else {
}
break;

// Display all entries in the address book
case "a":
System.out.println("All entries:");
addressBook.displayAll();
break;
// Quit the program
case"q":
System.out.println("Quitting...");
}
}
}
}
public class Node {
private String name;
private String address;
private Node next;
public Node(String name, String address) {
this.name = name;
this.address = address;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return this.address;
}
public void setAddress(String address) {
}

public Node getNext() {
return this.next;
}
public String toString() {
return "Name: "+ name +", Address:" +address;
}
public void setNext(Node node) {
this.next = next;
}
public void setAddress (Object newValue) {
}
public void setName(Object newValue) {
this.name = name;
}
}
CLASS TABLEA:
import java.util.Scanner;
public class Tablea {
private Node mark;
public Node getMark() {
return this.mark;
}
public void setMark(Node mark) {
this.mark = mark;
}
public boolean insert(String name, String address) {
Node newNode= new Node(name,address);
if (this.mark== null) {
this.mark = newNode;
}else {
newNode.setNext(this.mark.getNext());
this.mark.setNext(newNode);
}

return true;
}
public String lookUp(String name) {
Node current = this.mark;
while(current!=null) {
if (current.getName().equals(name)) {
return current.getAddress();
}
current = current.getNext();
}
return null;
}
public boolean delete(String name) {
Node prev = null;
while (current!= null) {
if (prev == null) {
this.mark = current.getNext();
}else {
prev.setNext(current.getNext());
}
return true;
}
prev = current;
}
return false;
}
public boolean update(String name, String newValue) {
while (current != null) {
current.setAddress(newValue);
return true;
}
}
return false;
}
public boolean markToStart() {

return false;
}
this.mark = null;
return true;
}
public boolean advanceMark() {
return false;
}
this.mark = this.mark.getNext();
return true;
}
public String keyAtMark() {
return null;
}
return this.mark.getName();
}
public String valueAtMark() {
return null;
}
return this.mark.getAddress();
}
public int displayAll() {
int count = 0;
while (current != null) {
System.out.println(current.getName()+":"+ current.getAddress());
count++;
}
return count;
}
}

why will it not display all of the entries-- output -nMenu n-Add Entr.pdf

why will it not display all of the entries-- output -nMenu n-Add Entr.pdf

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