To analyse the flow of program logic, step by step is called tracing. Usually you would use a tool called a debugger to do this for you. One simple tool is Throwable.getStackTrace() which will tell you where you are in the code, and how you got there. The following technique lets you put the name of the current method in error messages, or the name of the caller of the currrent method, or its caller etc. You might use it something like this:
imAt() in the following code sample will print out at com.mindprod.mypackage.Myclass.doSomething line 34. You could use similar code to return the name of the current class or method. Unfortunately, support for the methods this relies on is not guaranteed in all implementations.
In older Javas you will have to make do with new Throwable().printStackTrace(), or you can catch an exception and print with e.printStackTrace(). Thread.dumpstack() is a convenience method to do just that.
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