CODEWITHSUNDEEP
javahashmap
Basq
Basq

Reputation: 46

Hashmap not returning value as expected when retrieving using key

Should be simple enough but it's driving me nuts!

Have a HashMap with a Key:Value pair as Long:Dto respectively.

When I debug, I can see the one entry in the Hashmap with a Long value as the key - but when I try a get() using the Key, I'm getting a null back.

For the following:

Map<Long, Dto> response = getMap();

System.out.println("Contents of HashMap: " + response);
System.out.println("Size of HashMap: " + response.size());
System.out.println("HashMap Keyset: " + response.keySet());
System.out.println("HashMap Contains: " + response.containsKey(19999984L));
System.out.println("HashMap Object: " + response.get(19999984L));

I'm getting the following output:

Contents of HashMap: {19999984={productOptionId=19999984, amount={amount=20.99, currency=EUR}, pricingType=MSRP}}
Size of HashMap: 1
HashMap Keyset: [19999984]
HashMap Contains: false
HashMap Object: null

Any suggestions would be appreciated here... this should work surely!

Maybe I'm missing something obvious.

Answer: So it seems my key value is of String type - as below:

System.out.println("Contents of HashMap: " + response);
System.out.println("Size of HashMap: " + response.size());
System.out.println("HashMap Keyset: " + response.keySet());
System.out.println("HashMap Contains: " + response.containsKey("19999984"));
System.out.println("HashMap Object: " + response.get("19999984"));
System.out.println("HashMap Class: " + response.getClass());

Upvotes: 0

Views: 453

Answers (1)

PJAutomator
PJAutomator

Reputation: 342

Your key in the hashmap is a int type and your contains method has 19999984L which is long type. 

Contents of HashMap: {19999984={productOptionId=19999984, amount={amount=20.99, currency=EUR}, pricingType=MSRP}}
Size of HashMap: 1
System.out.println("HashMap Contains: " + response.containsKey(19999984L));

That's the reason for false.

Upvotes: 3

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