CODEWITHSUNDEEP
javahashmap
James Palfrey
James Palfrey

Reputation: 803

HashMap - Search for Value of Object and add to list

I have 2 classes Gym and gymMember. Currently Gym stores all gymMember in a HashMap gymMembers where String is their member ID (String).

gymMember holds the variables: 

  this.fullName = aName;
  this.address = anAddress;
  this.area = anArea;

What i'd like to go is search through the the HashMap gymMembers to find out what members are in area 1 stores in variable this.area and then return the gymMember object to a new set.

So far i've got this far:

public void findCustomersInArea(int x)
{
    // create a list to store all Customers
List<gymMember> aMember = new ArrayList<gymMember>();

// iterate all entries in the map
for (Map.Entry<String, gymMember> a: gymMembers.entrySet())
{
    // get the customer
    gymMember newMember = a.getArea();
    if (newMember.getArea() == x) {
        // do what you need to add to a list
       newMember.add(newCustomer);
    }
}
}

Does anyone have ideas where i'm going wrong?

Upvotes: 0

Views: 1328

Answers (2)

qrius
qrius

Reputation: 631

While iterating through the Map, instead of gymMember newMember = a.getArea();you should be doing:

gymMember newMember = a.getValue();Following would be your code: 

    for (Map.Entry<String, gymMember> a : gymMembers.entrySet()) {
        // get the customer
        gymMember newMember = a.getValue();
        if (newMember.getArea() == x) {
            // do what you need to add to a list
            aMember.add(newCustomer);//The name of your list is aMember and not newMember
        }
    }

since you want to check the area of each gymMember and not area of each entry in the map. In this case, since you are just accessing the values(i.e. gymMember) associated with each id, you can do: 

    for (gymMember gymMember : gymMembers.values()) {//where your Object would be gymMember
          if (gymMember.getArea() == x) {
            aMember.add(gymMember);
        }
    }

Upvotes: 1

barbakini
barbakini

Reputation: 3154

gymMember newMember = a.getValue ();
if (newMember.getArea() == x) {
    // do what you need to add to a list
   aMember.add(newMember);
}

Upvotes: 1

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