List contains object

[Bcuthbe]

All i have my list, and when i download new data i want to check if the list already has a certain object.

So if i do the following it does not work.

if(list.contains(newobject){
System.out.println("List already has this object in it.");
} else {
System.out.println("LIst does not have this object");
}

Is there another way to test the list to check if it has an object ?

[James Lemieux]

Ben,

   You haven't overridden your .equals() method on the Class of newobject (this requirement is described in the List.equals() javadoc)

 OR

you have implemented .equals() but your implementation has a bug in it.

James

PS: Remember that if you override .equals() you should also override .hashCode() as per the contract described in the javadoc.

On Tue, Jul 1, 2008 at 9:24 PM, Bcuthbe <ben_cuthbert@...> wrote:

All i have my list, and when i download new data i want to check if the list
already has a certain object.

So if i do the following it does not work.

if(list.contains(newobject){
System.out.println("List already has this object in it.");
} else {
System.out.println("LIst does not have this object");
}

Is there another way to test the list to check if it has an object ?
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