Creating a TreeMap within a TreeMap.

[millz]

I am trying to create a tree map within a TreeMap.
Any help would be great.
goes a bit like this:

public class ChessImpl implements CHESS
{
    private Map<String, Integer> name;
    private int membernumber;
    private Map<String, Map<Integer, Holding>> stock;
    private Map<Integer, Holding> intSearch;
    private Holding holder;
 
 
    public ChessImpl()
    {
        name = new TreeMap<String, Integer>();
        membernumber = 1;
        stock = new TreeMap<String, Map<Integer, Holding>>();
    }
 

With the stock map do I need to create another map before i insert it?
Main problem is when i use the put method it wont accept it?

    public void issue(String stockCl, String client, int nshares)
    {
        if(name.containsKey(client) && (nshares > 100))
        {
        Holding holder = new Holding(stockCl, client, nshares);
int memNum = name.get(client);
  stock.put(stockCl, (memNum, holder)) //THIS IS WHERE IM HAVING THE MAJOR PROBLEM
        }
        else
        {
            System.out.println("Client name has not been created or the amount of shares is less than 100");
        }
 

I keep getting a error message. this is the holding class just for refrence.

public class Holding  
{
 
    private String stock;
    private String client;
    private int shares;
    public Holding(String stock, String client, int shares)
    {
        this.stock = stock; 
        this.client = client; 
        this.shares = shares;
    }
 

[JosAH]

I keep getting a error message.

What is the exact error message? Is it a compilation error or a runtime error?

kind regards,

Jos

[Nepomuk]

I am trying to create a tree map within a TreeMap.
Any help would be great.
goes a bit like this:

public class ChessImpl implements CHESS
{
    private Map<String, Integer> name;
    private int membernumber;
    private Map<String, Map<Integer, Holding>> stock;
    private Map<Integer, Holding> intSearch;
    private Holding holder;
 
 
    public ChessImpl()
    {
        name = new TreeMap<String, Integer>();
        membernumber = 1;
        stock = new TreeMap<String, Map<Integer, Holding>>();
    }
 

With the stock map do I need to create another map before i insert it?
Main problem is when i use the put method it wont accept it?

    public void issue(String stockCl, String client, int nshares)
    {
        if(name.containsKey(client) && (nshares > 100))
        {
        Holding holder = new Holding(stockCl, client, nshares);
int memNum = name.get(client);
  stock.put(stockCl, (memNum, holder)) //THIS IS WHERE IM HAVING THE MAJOR PROBLEM
        }
        else
        {
            System.out.println("Client name has not been created or the amount of shares is less than 100");
        }
 

I keep getting a error message. this is the holding class just for refrence.

public class Holding  
{
 
    private String stock;
    private String client;
    private int shares;
    public Holding(String stock, String client, int shares)
    {
        this.stock = stock; 
        this.client = client; 
        this.shares = shares;
    }
 

Quick answer: Yes, you must create an Object, before using it. Instead of

stock.put(stockCl, (memNum, holder));
 

you want something like

TreeMap tmpMap = new TreeMap();
tmpMap.put(memNum, holder);
stock.put(stockCl, tmpMap);
 

That should do the job.

Greetings,
Nepomuk

[millz]

Thanks for the suggestions ill try that code 2nite.