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Difference between ArrayList<int> and ArrayList<Integer>

 
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ArrayList<int> al1 = new ArrayList<int>();
ArrayList<Integer> al2 = new ArrayList<Integer>();

Any difference between them?
 
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The first one won't compile!

Although Java 5 and up blur the difference a little, an Integer is an object, and an "int" is not. You can only use object types as type parameters.
 
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Parameter should be of type Object, no primtive data type are allowed here.....
 
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