java - Synchronizing on a passed object, JFrame is freezing -

i created jframe contains , internalframe draws figures moving(each figure thread) wanted pausebuttonmake pause, wanted synchronize them on passed object.

but when hit pause button whole window freezing , cannot hit play button thing 1 running @ time, want them running pause.

 class extends jframe{      ....     object o = new object();     jbuttton pausebutton = new jbutton("pause");    jbuttton playbutton = new jbutton("play");     b b = new b(o);         pausebutton.addactionlistener(new actionlistener() {                 @override             public void actionperformed(actionevent arg0) {                 synchronized (synchronizator) {                     try {                         synchronizator.wait();                     } catch (interruptedexception e) {                         e.printstacktrace();                     }                    }              }         });         playbutton.addactionlistener(new actionlistener() {              @override             public void actionperformed(actionevent arg0) {                 synchronized (synchronizator) {                     synchronizator.notifyall();                  }              }     ...     } 

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class b extends jinternalframe{ object o; b(object o){this.o = o} ./...  many... c thread = new c(o);  .... } 

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    class c extends thread{     object o;     booolean running;     public void run(){     while(running){        synchronized(o){          }     }     }  } 

noooo!! ;)

all swing activity should done on awt event dispatch thread (edt). use normal thread-agnostic objects , perhaps javax.swing.timer (not java.util!) timing.

you may want other things not involving swing on different threads, suggest keeping clean separation. few objects should dealing thread issues.

if using bare low-level java synchronisation facilities, set condition prior notify/notifyall , put waits within while loops.