Mapping: "redundant type arguments in new expression (use diamond operator instead)"

I am getting a notification on the line number in NetBeans saying "redundant type arguments in new expression (use diamond operator instead)".

I have only just learnt basic mapping theory and this is my first time using it. I have tested my code and the map actually appears to be working perfectly fine - no compilation errors, no runtime errors.



This is the line of code with the alert put on it.

Code:

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HashMap<String, AtoCSeat> seatMap = new HashMap<String, AtoCSeat>();

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Is there something wrong with it?
AtoCSeat is my own data type.

There is nothing wrong, the IDE is just suggesting you write it as

Code:

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HashMap<String, AtoCSeat> seatMap = new HashMap<>();

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See the Type Inference for Generic Instance Creation notes that come with the JDK 7 sdk.

ah right, ok, thanks.