Interview questions, child threads 10 times child thread 2 executes 20 times with the main thread 100 times back and forth loop execution 50 times

For the interview, child thread 2 executes 10 sub-threads 2 execution 20 times   100 times with the main thread to loop the execution 50 times public class interview {public static  Void main (String[] args)  {final business b = new business ();new  Thread (New runnable () {@Overridepublic  void run ()  {for  (int i = 1;  i <= 50; i++)  {b.sub2 (i);}}). Start (); New thread (New runnable () {@Overridepublic  void run ()  {for  (int i  = 1; i <= 50; i++)  {b.sub3 (i);}}). Start ();for  (int i = 1; i <= 50; i++)  {b.main (i);}} class business{private int order=1; Lock lock = new reentrantlock (); Condition con1 = lock.newcondition (); Condition con2 = lock.newcondition (); Condition con3 = lock.newcondition ();p ublic void sub2 (int i) {lock.lock (); try  {while  (Order&NBSP;!=&NBSP;2)  {try {con2.await ();}  catch  (interruptedexception e)  {e.printstacktrace ();}} for  (int j = 1; j <= 10; j++)  {system.out.println ("sub2  thread is sequence of  " + j+ ". lamp of  " + i);} System.out.println ("/... ............"); order = 3;con3.signal ();  finally{lock.unlock ();}} PUBLIC&NBSP;VOID&NBSP;SUB3 (int i) {Lock.lock ();try {while  (order != 3)  {try  {con3.await ();}  catch  (interruptedexception e)  {e.printstacktrace ();}} for  (int j = 1; j <= 20; j++)  {system.out.println ("sub3  thread is sequence of  " + j+ ". lamp of  " + i);} System.out.println ("/... ............"); order = 1;con1.signal ();  finally{lock.unlock ();}} Public void main (int i) {LOck.lock ();try {while  (order != 1)  {try {con1.await ();}  catch  (interruptedexception e)  {e.printstacktrace ();}} for  (int j = 1; j <= 100; j++)  {system.out.println ("main  thread is sequence of  " + j+ ". lamp of  " + i);} order = 2; System.out.println ("......................  finally {lock.unlock ();}}}

This article comes from "either desperately, or roll back!" "Blog, be sure to keep this provenance http://jiangzuun2014.blog.51cto.com/8732469/1538354