java - Swing Timer issue - stop Timer -

i have been trying stop timer , solve days now, unfortunately no luck, hope able help.

the idea use timer click button increases value in text field have timer in start button , wish stop in stop button.

that's code have behind start button:

private void btstarttimeractionperformed(java.awt.event.actionevent evt) {           javax.swing.timer tm = new javax.swing.timer(100, new actionlistener(){             public void actionperformed(actionevent evt) {                  btaddoneactionperformed(evt);                }         }); tm.start(); 

}

 private void btstoptimeractionperformed(java.awt.event.actionevent evt) {   } 

you've got problem of scope in posted code: timer variable, tm, declared within start button's actionperformed method , is visible within method. cannot viable reference when outside of method. solution declare variable on class level private instance (non-static) variable, , call start() on within start button's action listener. make variable visible throughout class, , stop button's listener should able call methods.

e.g.,

package pkg3;  import java.awt.event.actionevent; import java.awt.event.actionlistener;  import javax.swing.jbutton; import javax.swing.timer;  public class timerdeclaration {     private static final int delay = 1000;      // tm2 variable visible throughout class     private timer tm2 = new timer(delay, new timerlistener());      private jbutton btstarttimer1 = new jbutton("start timer 1");     private jbutton btstarttimer2 = new jbutton("start timer 2");      public timerdeclaration() {         btstarttimer1.addactionlistener(e -> btstarttimer1actionperformed(e));         btstarttimer2.addactionlistener(e -> btstarttimer2actionperformed(e));     }      private void btstarttimer2actionperformed(actionevent e) {         tm2.start(); // tm2 visible throughout program     }      private void btstarttimer1actionperformed(actionevent e) {         javax.swing.timer tm = new javax.swing.timer(100, new actionlistener() {             public void actionperformed(actionevent evt) {                  // btaddoneactionperformed(evt);             }         });         tm.start(); // visible inside here!!!     }      private class timerlistener implements actionlistener {         @override         public void actionperformed(actionevent arg0) {             // todo auto-generated method stub          }     } }