troubleshooting Question

Easy ArrayList Question

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PowerEdgeTechFlag for United States of America asked on
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Easy question:

ArrayList<String> alist = new ArrayList<String>();
ArrayList<String> alist = new ArrayList<>();
ArrayList<String> alist = new ArrayList();

All of the above SEEM to work identically.  Is that indeed the case?  Netbeans indicates that the first one is "redundant" and is happy with the last two.  Which is most correct, or is there one that is considered just good programming practice?  Is there any circumstance where one would be required over another?
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