CODEWITHSUNDEEP
java
user3404896
user3404896

Reputation: 1

How to check if member exists

So i have implemented the insert method and it works just fine but my problem is how to check whether a member is already in the list or not,i want the program to check if the member is already in the list but the checker doesn't work. i want the program to put the member in team1 if the member is included in the list and Display "member does not exist" if the member is not on the list. I made a check method but it doesn't work. I am new in Programming and i really need help. Please enlighten me with your knowledge.

class Node
{
    protected String info;
    protected Node next;
    public Node(String value)
    {
        info = value;
        next = null;
    }
}
class LinkedList
{
    private Node head;
    private int count;
    public LinkedList()
    {
        head = null;
        count = 0;
    }
    public void insert( String name)
    {
        Node a = new Node(name);
        a.next = null;
        count++;
        if (head == null)
        {
            head = a;
            return;
        }
        for(Node cur = head; cur != null; cur = cur.next)
        {
            if (cur.next == null)
            {
                cur.next = a;
                return;
            }
        }
    }

    public void checker(String name)
    {

        for(Node cur = head; cur != null; cur = cur.next)
        {
            if(cur.info == name)
            {
                insertteam1(name);
                System.out.print("OK");
            }
            else
            {
                System.out.print("member does not exist");
            }
        }
    }
    public void insertteam1(String name)
    {
        Node b = new Node(name);
        b.next = null;
        count++;
        if (head == null)
        {
            head = b;
            return;
        }
        for(Node cur = head; cur != null; cur = cur.next)
        {
            if (cur.next == null)
            {
                cur.next = b;
                return;
            }

        }
    }

Upvotes: 0

Views: 262

Answers (1)

anirudh
anirudh

Reputation: 4176

In the code below,

if(cur.info == name){ // }

you are comparing the string info using == which is not the right way to compare strings in java.

Use if(cur.info.equals(name)){ // } or

use if(cur.info.equalsIgnoreCase(name)){ // } if you want to do case insensitive compare.

Upvotes: 2

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