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Error while compiling

mahesh amber
Greenhorn

Joined: Mar 11, 2008
Posts: 7
why i my getting the error while compiling the java program


here what is unchecked and unsafe operations and when i compile with -Xlint it gives a series of warning that no where related to my program
thanks in advance
mahesh
abhishek pendkay
Ranch Hand

Joined: Jan 01, 2007
Posts: 184
Hi mahesh
what you are getting is not a error its a warning, which means you can still execute your code....
you are getting this warning because you are using non-generic collections in your code... Generics is a feature newly added to Java 5 which basically makes your collections type safe meaning you can restrict the type of objects your collection can hold....
for eg in Java 5 you would declare a List as
List<String> list = new ArrayList<String>();
the above declaration will construct a list which will hold only Strings ,trying to add anything other than String will result in a compile error the <String> is the Generic syntax
Similarry you can also make a List as
List<MyClass> list = new ArrayList<MyClass>();
which will hold only objects of MyClass
this basically gives you type safety ( hence the warning unsafe unchecked operations because non-generic collections are not type safe meaning you can any object in them )
If you are new to Java 5 or new to Generics maybe you should spend some time getting familar with it
[ March 21, 2008: Message edited by: abhishek pendkay ]

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mahesh amber
Greenhorn

Joined: Mar 11, 2008
Posts: 7
thanks for the reply
but iam able to execute the code if i compile with Xlint then i get some warnings
 
 
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