java - JButton does not change a field value -

i facing strange problem simple jframe application has 1 button in order change field value. when try debug application, works fine, when try run it, doesn't work , gets stuck in while loop. graphics class:

public class test extends jframe implements actionlistener {     private static final long serialversionuid = 1l;     private boolean connectpressed;     public jbutton btnconnect;     public test()     {         jpanel p = new jpanel();         p.setlayout(null);          // connect button         btnconnect = new jbutton("connect");         btnconnect.setbounds(0, 0, 100, 20);         p.add(btnconnect);         btnconnect.addactionlistener(this);                getcontentpane().add(p);         setdefaultcloseoperation(exit_on_close);         settitle("client");         setsize(200,200);         setvisible(true);     }      public boolean get()     {         //system.out.println(connectpressed);         return connectpressed;     }      public void set(boolean b)     {         connectpressed = b;     }      @override     public void actionperformed(actionevent e)     {         //e.getactioncommand();         connectpressed = true;         system.out.println(connectpressed);     }  } 

and here test code application:

public class test2 {     public static void main(string[] args)     {         system.out.println("hello");         test t = new test();          t.set(false);         while (true)         {             if ((t.get()))                 break;                       }         system.out.println("bye");      }  } 

can me problem?

when run this:

while (true) {     if ((t.get()))         break;               } 

the thread eat cpu, making ui unresponsive; overcome, 1 easy way adding sleep time inside loop:

while (true) {     thread.sleep(250); // sleep 250 msecs     if (t.get())         break;               } 

anyway example, not solution; better way registering main class listener, or running loop in separated thread.