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ArrayList sorting

 
Jeansonne Pierre
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this code compiled succeed, but come out with warning message as below

Note: .\Sorting.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.


which part of code should i modify or improve to remove the warning messages?

Please help.
Thanks in advance
 
Winston Gutkowski
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Jeansonne Pierre wrote:which part of code should i modify or improve to remove the warning messages?

Add a type to your Arraylist, viz:
ArrayList<Double> arrayList = new ArrayList<Double>();

Winston
 
Jeansonne Pierre
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Thanks Winston Gutkowski,

the warning messages gone and it succeed.

anyway, I'm wondering why it is

instead of ?

as the method argument received is in double primitive type.
 
Winston Gutkowski
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Jeansonne Pierre wrote:anyway, I'm wondering why it is

as the method argument received is in double primitive type.

Because types must be objects. An ArrayList can't hold doubles.

Winston
 
It is sorta covered in the JavaRanch Style Guide.
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