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Thread: toString method()

  1. #1
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    Default toString method()

    Well,I was hoping I could avoid this but here I am

    My problem is the following. In this Class person

     
    class Person {
      final String name;
      final String address;
      final String phoneNr;
     
      Person(String name, String address, String phoneNr) {
        this.name = name;
        this.address = address;
        this.phoneNr = phoneNr;
      }
     
      @Override
      public String toString() {
        return String.format("%-10s, %-20s, %-10s", name, address, phoneNr);
      }
     
    }

    There is this toString method.Now the instructions in the assignment say to rewrite it in the PhoneBookList class.


     
    class PhoneBookList implements PhoneBook {
        private int size = 0;
        Node head = null;
     
        private static final class Node {
            final Person person;
            Node next;
     
            Node(Person person) {
                this.person = person;
            }
        }
     
       public boolean insert(Person person) {
     
            Node n = new Node(person);
     
            if (head == null) {
                head = n;
                size++;
                return true;
            }
     
            Node current = head;
            Node prev = null;
            int comparison;
     
            while (current != null) {
                comparison = person.name.compareTo(current.person.name);
                if (comparison == 0) {
                    return false;
                } else if (comparison > 0) { 
     
                    if (current.next == null) { 
                        current.next = n;
                        break;
                    }
                    current = current.next;
                } else { 
                    if (prev == null) { 
                        Node oldHead = head;
                        head = n;
                        head.next = oldHead;
                        break;
                    }
                    prev.next = n;
                    n.next = current;
                    break;
                }
                prev = current;
                current = current.next;
            }
            size++;
            return true;
        }
     
    	public int size() {
    		Out.formatln("The phone book has: %d entries",size );
    		return size;
    	}
     
    	public boolean delete(String name) {
            if (head == null) {
                return false;
    		}
            if (head.person.name.compareTo(name) == 0) {
                head = head.next;
                size--;
                return true;
            }
     
            Node current = head;
            Node prev = head;
            while (current != null) {
                if (current.person.name.compareTo(name) == 0) {
                    prev.next = current.next;
                    size--;
                    return true;
                }
                prev = current;
                current = current.next;
            }
    		return false;
        }
     
    	public Person lookup(String name) {
     
            if (head == null) { 
                return null;
            }
     
            Node current = head;  
            while (current != null) {
                if (current.person.name.compareTo(name)==0) { 
                    return current.person;
                }
                current = current.next; 
            }
            return null;
        }
    public String toString() {
        return String.format("%-10s, %-20s, %-10s", name, address, phoneNr);
      }
     
    }
    }

    Now when I do this I get an compile error saying it cannot find these 3 parameters (name,address,phonenr). How do I implement this method?

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: toString method()

    compile error saying it cannot find these 3 parameters (name,address,phonenr)
    What value(s) do you want to be in the String returned by the toString method?
    What are the names of the variables with those values and how can the toString method get their values?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: toString method()

    Hey,just want to say that I have solved this issue with an StringBuilder. (the professor gave an us some hints and examples).But for some reason I couldn't log on to the site,better said "reach" the site till today.

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