how to view where a thread is in code java

Question

Can you print out what line in the code and what method a running thread is in, from within a program - without using some monitoring software like visualvm? Do you have to extend Thread?

Answer 1

If this is just for quick-and-dirty debugging or error reporting, you can just do

new Exception().printStackTrace()

If you want to be a little fancier than that, you can use Thread.currentThread().getStackTrace() to get an array of StackTraceElement objects; you can determine the current line number by examining those.