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Java Java Data Structures - Retired Exploring the Java Collection Framework Maps

Nick Vitsinsky
Nick Vitsinsky
7,246 Points
Posted by Nick Vitsinsky
Nick Vitsinsky
7,246 Points

Why hashTagsCount.get(HashTag); and not hashTagsCount.getHashTag; w/o ()

I just can't understand why do we write hashTagsCount.get(HashTag); instead of hashTagsCount.getHashTag; Can someone please explain me that?

1 Answer

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

I assume the line of code you are questioning is this:

Integer count = hasTagCounts.get(hashTag);

Here hasTagCounts is a Map<String, Integer>, get is a function, and hashTag is an argument being passed to the function.

If you had a sqrt() function and you wanted to pass it a value that is stored in the variable theValue you would write sqrt(theValue), not sqrttheValue.

The parentheses are necessary to separate the function from the value being passed to it.