stack trace - Why does getStackTrace() return different addresses in this Java code? -

i have following simple java code :

try { -     processbuilder pb = new processbuilder("thebatchfile.bat", "argument1", "argument2");     pb.directory(new file("/path/to/working/dir"));     process p = pb.start();     p.waitfor();  } catch ( ioexception e) {      system.out.println(thread.currentthread().getstacktrace());     system.out.println("heres line");     system.out.println(e.getstacktrace() ) ;      system.out.println (" print-statement after stacktrace"); } 

and when run twice in row , return different results. here's output:

[ljava.lang.stacktraceelement;@fe64b9 heres line [ljava.lang.stacktraceelement;@186db54  print-statement after stacktrace 

i curious going on here - why that, though compiled it, , run same code, still give different results getstacktrace()

the getstacktrace() method defined in throwable class (the superclass of exceptions) as:

public stacktraceelement[] getstacktrace() {     return getourstacktrace().clone(); } 

so each time invoked (whether using exception#getstacktrace() or using thread#getstacktrace()), return new object. hence new hash code expected printed.