What is the use of printStackTrace() method in Java?

Question

I am going through a socket program. In it, printStackTrace is called on the IOException object in the catch block.
What does printStackT

Answer 1

It's a method on Exception instances that prints the stack trace of the instance to System.err.

It's a very simple, but very useful tool for diagnosing an exceptions. It tells you what happened and where in the code this happened.

Here's an example of how it might be used in practice:

try {
    // ...
} catch (SomeException e) { 
    e.printStackTrace();
}