Can we use try without using catch and finally block?
No u cannot
Yes, but just in the version7 of the java.
No. A try block will contain a statement that will throw an Exception. That has to be caught by at least one catch block. If you don't have a catch block, who will catch that exception? The finally block is optional, BTW.
In short, no, you cannot have an isolated try block without a catch block following it.