why does the catch block give an error with variable not initialized in Java

Question

This is the code that I\'ve written.

int num;
try {
    num=100;
    DoSomething();
    System.out.println(num);
} catch(Exception e) {
    DoSomething1();
}         


        

Answer 1

Local variables in Java are not initialized automatically. So you need to initialize it before use them.

int num=0;
try
{
  .. 
}
...

Fore more info read - Definite Assignment (JLS - 16.2.15 try Statements)