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yarekGmail

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java : set arraylist, maps, sets, hashmaps

hello experts
I am new to Java
I am really too confused about all types that allow to store objects and data like
Arrays, sets, Map, hashmap, ArrayList, lists, tree etc...

Can someone tell me what are the most usefull (the 3-4 I will use in my projects) and in what case should I use this one rather then anorther one ?
Thanks
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