Some simple question , but i dont know...try & catch ..

Question

Hi i was working on a media player and i've faced some problems...like what exactly does the try&catch do ??
and in the Player class what the realize() and prefetch do ??
Thank you in advance..
Mulham Haffar

Answer 1

If you are in doubt when or what exceptions to catch, use the java compiler as your guide. You will get compile time errors that clearly name the exception you have to catch with the line of code that could cause the exception/error. Then do the following:
try {
  // the code that could throw the exception
} catch ([the-name-exception] e) {
  e.printStackTrace();
  // or do something else relevant here - this code gets executed when the exception is thrown
} finally {
  // this is an optional block that is always executed before returning from the method (even if there was an exception thrown - do stuff like closing resources here
}where [the-name-exception] is the exception class I mentioned earlier.
You can also declare a method to throw the exception if you don't want to catch it. Just use the keyword "throws" followed by the class name of the exception. Then any place where you call the method will have to catch the exception.
You can also find out what exceptions are being thrown by looking in the JavaDocs. There is plenty more, but that is what you will need to get your program compiling.