java - Why can't wake up this thread -

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i want test thread.sleep() method, , found interesting thing.. when invoke main() method , console print "usera sleeping..." , "usera waking...", means program awakened , when use junit method run same code main() method, won't print "usera waking..." ... appreciate can explain . 

package com.lmh.threadlocal;  import org.junit.test;  public class threadtest {      public static void main(string [] args) {         new thread(new usera()).start();     }     @test     public void testwakeup(){         new thread(new usera()).start();     }  }  class usera implements runnable{     @override     public void run() {         try {             system.out.println("usera sleeping...");             thread.sleep(1000);             system.out.println("usera waking...");         } catch (interruptedexception e) {             e.printstacktrace();         }      } }

my guess junit tearing down test before sleep finishes, because test execution thread exits test method before sleep finishes. try

@test public void testwakeup() throws exception {     thread t = new thread(new usera());     t.start();     t.join(); }

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