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I am trying to build a HashMap which will have integer as keys and objects as values.
My syntax is:
HashMap<int, myObject> myMap = new HashMap<int, myObject>(); However, the error returned is - Syntax error on token "int", Dimensions expected after this token - I don't understand why I should add a dimension (ie: making the int into an array) since I only need to store a digit as key.
What could I do?
Thanks in advance! :)
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HashMap doesn't handle primitives, just objects. Related SO question, but with int being the value, not the key.
These are things like integers, floats, strings, Booleans, functions. Even tuples can be a key. A dictionary or a list cannot be a key.
Yes, a HashMap can be used as a key to another map, as the class properly overrides .
You cannot do it this way. Both t and a will have different hashCode() values because the the java. lang. Array.
Use Integer instead.
HashMap<Integer, MyObject> myMap = new HashMap<Integer, MyObject>(); Java will automatically autobox your int primitive values to Integer objects.
Read more about autoboxing from Oracle Java documentations.
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