Vector class warning

Question

i am learning to use the vector class. i am getting this warning but the program still runs:
warning: [unchecked] unchecked call to addElement(E) as a member of the raw type java.util.Vector
heres the code:
int a=0;
Vector i=new Vector();
i.addElement(a);//this is the line causing the warning
System.out.println(i.elementAt(0));why is the compiler returning this warning but still allowing the program to run?

Answer 1

Getting back to the original quesiton......
After you do some research on generics, try to get rid of all those warnings by implementing generics properly in your code. Its not hard once you correct a few such problems and see how its done.
Although you don't have to correct them since they are only warnings, its good practice since seeing 100 generics warnings may hide other types of warnings you should really look into. Note you can't always get rid of the warnings since generics aren't backwardly compatable with certain java classes (such as ArrayList.toArray()?). To hide these warnings, put @suppressWarnings("unchecked") above the function you want to hide those warnings.
suppressWarnings will only work for jdk 1.5 and later(?).
By the way, your code has i.addElement(a) where a is an integer. You might want to read up on autoboxing since java converts this int to an Integer.
Edited by: njb7ty on May 31, 2008 4:36 PM