CODEWITHSUNDEEP
javahashmapsizeconditional-statements
MrAsstastic
MrAsstastic

Reputation: 1

How do I check the size of a HashMap for a conditional statement

Sorry I'm really new to programming. I'm messing around and making a simple text based game and I am stuck at trying to check the size of this HashMap in my conditional statement.

Here is the method:

/**
* Lists all the items in a room.
*/
public String getItemList()
{
    String NoItemList = "There are no items in this room.";
    String ItemList = "Items:"; Set<String> keys = items.keySet(); 

    for(String item : keys) 
    {
        ItemList += " " + item; 
    }

    if (items.size < 1)
    {
        return NoItemList;
    }

    if (items.size > 1)
    {
        return ItemList;
    }
}

How can I get it to work so that if there are items in the HashMap it will return ItemList, and if there are none to return NoItemList?

Thanks

Upvotes: 0

Views: 3099

Answers (3)

Kevin Bowersox
Kevin Bowersox

Reputation: 94469

On HashMap or Collection (which HashMap implements) size is a method use:

items.size()

The conditional could be rewrote to:

if (items.size() < 1)
{
    return NoItemList;
}else{
    return ItemList;
}

Or if your comfortable with ternary expressions:

return (items.isEmpty()) ? NoItemList:ItemList;

Notice this form of the method uses the isEmpty() method which is a shortcut for checking if the list does not contain any items.

Upvotes: 2

Kick
Kick

Reputation: 4923

You can use size() method to check the size of hashMap as below :

ItemList.size()  --> Return the size of map

Upvotes: 0

Roberto Anić Banić
Roberto Anić Banić

Reputation: 1421

Fixed code:

    if (items.size() == 0)
{
    return NoItemList;
}

if (items.size() > 0)
{
    return ItemList;
}

Upvotes: 0

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