Java threads Live and thread execution issues!

1 /*2 The following program will appear below, when Thread-0, Thread-1, Thread-2 are wait, they may wake up at the same time3 Thread-0 put4 Thread-1 put5 Thread-2 put6 Thread-3 get//Here, Thread-3 get the lock, wake up all the waiting threads and have the following output7 Thread-2 put8 Thread-1 put9 Thread-0 putTen */ One  A  - Although multiple threads will wake up at the same time, only one can get the CPU execution right!  - in short, the synchronization can only be performed in one, but the survival is not necessarily one!  the  -  - classduckd{ -      Public voidput () { +          -Synchronized (DUCKD.class){ +            ASystem. out. println (Thread.CurrentThread (). GetName () +"put"); at               Try{ -DUCKD.class. Wait ();//Thread-0, Thread-1, Thread-2 may wake up here at the same time!  -}Catch(interruptedexception e) { -                   -               } -               //........ in         } -     } to      +      Public void Get(){ -          theSynchronized (DUCKD.class){ *  $DUCKD.class. Notifyall ();Panax NotoginsengSystem. out. println (Thread.CurrentThread (). GetName () +"Get"); -               Try{ theDUCKD.class. Wait (); +}Catch(interruptedexception e) { A                   the               }          +         } -     } $ } $  - classproduced implements Runnable{ - duckd dk; the produced (Duckd dk) { -         This. dk=dk;Wuyi     } the      Public voidrun () { -         while(true) Wu dk.put (); -     }     About } $  - classconsumed implements runnable{ - duckd dk; - consumed (duckd dk) { A         This. dk=dk; +     } the      Public voidrun () { -          while(true) $Dk.Get(); the     }     the } the  the classtest{ -     Public Static voidMain (string[] args) { inDUCKD dk=Newduckd (); theThread t1=NewThread (Newproduced (DK)); theThread t2=NewThread (Newproduced (DK)); AboutThread t3=NewThread (Newproduced (DK)); theThread t4=NewThread (Newconsumed (DK)); the         the T1.start (); + T2.start (); - T3.start (); the T4.start ();Bayi    } the}