try,catch and finally blocks

[narasimha munagala]

Hi to everyone
I am new to java i want to know
in all the try ,catch,finally blocks return statements exists
if an exception raised in the try block then which return
statement execute
and if an exception not raised in the try block then
which return stetment execute.
Any one know answer for this question please give me answer
thank you

[Ben Souther]

narasimha munagala,
Welcome to JavaRanch!

In an effort to help you get the most from our forums, we've compiled a
list of tips for asking questions here. You can find the list in our
FAQ section here.
In particular please see:
CarefullyChooseOneForum

The JavaRanch forums are divided by category.
You stand a much better chance of getting a good answer if you ask your question in the right one.

I'll move this to Java In General (Intermediate) for you.

Again, welcome to JavaRanch and good luck with your question.
-Ben

[Chris Corbyn]

Can someone explain what the difference between using "finally" and just putting the code after the try/catch is too?

try {
  throw new Exception("Foobar");
} catch (Exception e) {
  //whatever
} finally {
  System.out.println("here");
}
 
//What's different to this?
try {
  throw new Exception("Foobar");
} catch (Exception e) {
  //whatever
}
System.out.println("here");

[mohan kumar r]

try this(asume there is no file abc.txt)

public class TRYCATCH {
public static void main(String[] args) {
try{
System.out.println("before call");
TRYCATCH.method();
}catch(Exception e){
System.out.println(e.getMessage());
}
}
private static void method()
{
File f = new File("c:/abc.txt");
try{
System.out.println("===before fis====");
FileInputStream fis = new FileInputStream(f);
System.out.println("===after fis====");
return;
}
catch(Exception e){
System.out.println("===in catch====");
return;
}finally{
try{
FileInputStream fis = new FileInputStream(f);
System.out.println("===in finally====");
return;
}catch(Exception e){
System.out.println("===inside finally catch====");
}
}

}
}

[mohan kumar r]

Hi Chris,
try this(with and witout finally block).Now the difference is obvious.

public static void main(String[] args) {
try{
System.out.println("before call");
TRYCATCH.method();

}catch(Exception e){
System.out.println(e.getMessage());
}

}
private static void method() throws Exception
{
try {
FileInputStream fis = new FileInputStream(new File("c:/abc.txt"));
}
catch (Exception e) {
throw new Exception("Foobar");
}
//finally {
System.out.println("here");
//}
}
}

[Chris Corbyn]

Clear as mud I guess people generally use finally{} when they need to clean up irregardless then?

public class Foo {
  public static void main(String[] args) {
    try {
      if (true) {
        System.out.println("About to throw exception...");
        throw new Exception("Exception thrown....");
      }
    } catch (Exception e) {
      System.out.println("Exception caught: " + e + "...");
      return;
    } finally {
      System.out.println("In finally...");
    }
    System.out.println("I got here (or rather I didn't!!)");
  }
}

[John Grath]

Remember, finally code is always executed regardless if an exception was throw n or not.

[Nicholas Jordan]

[Chris Corbyn :]Can someone explain what the difference between using "finally" and just putting the code after the try/catch is too?

I snagged on this earlier also. This time the beginner with Posts == 4 gets the answer.

GIVEN:

IO some io or other ;/
try{ioyoyo.read();}
catch(yo-yo){bailout; return; quit; stop;}
finally{check see if maybe we can fix it with some new computer science.}  

What you get is a badly hung machine and a fouled-up mess that would be better left to recovery team.
[ September 22, 2007: Message edited by: Nicholas Jordan ]