Exceptions

[Kedar Nath]

What is the difference between JVM thrown exception and programmatically thrown exception...
the difference is kind of blur...
LIke the IllegalArgumentException(Programmatically), which is thrown when the method receives arg differently formated.But the method is actual receiveing the argument which is sent by the us!!
Similarly, ClassCastException(JVM), when coding we did the casting in a wrong manner.So it should be programmtically thrown..

But StackOverflowError, sound correct i mean as a JVM thrown..

Please dont if i sound stupid ...
Please explain

[Ankit Garg]

Keday a programmatic exception is thrown explicitly using a throw clause which a JVM exception occurs at the level of the JVM without anyone throwing it. The example you gave i.e. IllegalArgumentException is thrown explicitly in methods. You can also use this technique in your programs. Take this example

/**
@param age Age must not be negative
*/
public void setAge(int age) {
   if(age < 0) {
      throw new IllegalArgumentException();
   }
}

But when a ClassCastException occurs, it occurs automatically. It is not thrown by using a throw statement. You are right that the exception occurs due to our programming fault this is why it has been made an unchecked exception because it can be avoided using a simple instanceof test...

[Kedar Nath]

So can i say that Programmatically exception are those that can be thrown using throw keyword and the others as JVM exceptions???

[Devaka Cooray]

Kedar Nath wrote:So can i say that Programmatically exception are those that can be thrown using throw keyword and the others as JVM exceptions???

JVM exceptions are the exceptions which can be thrown by the JVM, typically not by you or any other API class. But remember that we can use the "throw" keyword to raise any Exception, including Errors (Eg: NoClassDefFoundError). That keyword can be used in front of any class, which extends the Throwable class.

Cheers,

Devaka.