Re: unclear new Object declaration
ACompetitorsChallenge@gmail.com wrote:
I am working from preexisting code by a programmer who is not
available for clarification on a line of code ...
l1:import model.Manager;
l2:public class DataSourceConnectionObject {
l3: public static void main(String[] args) {
l4: try {
l5: Manager manager =null;
...
is all that line 5 is declaring is a new instance of "Manager" and
naming it "manager" and assigning the expression a "null" value
without the "new" clause used to issue it?
any help would be nice
thx
manager is a reference variable of type Manager assigned the value of null.
That is often done before a try/catch block so that cleanup or other
code can be run in the catch or finally using that reference.
Manager manager = null
try {
manager = SomeManagerCreater();
// something that can cause an exception
} catch (SomeException se) {
if (manager != null)
manager.cleanup();
}
You'll see that a lot when opening streams for I/O.
--
Knute Johnson
email s/nospam/knute2009/
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