java - Creating live counter within a JFrame -

i tried searching sort of interactive jlabel. want this:

i'm not sure called or find info on displaying this. want print refreshed number when +/- pressed. have working print on eclipse console unsure how print jframe.

here of code:

string input = joptionpane.showinputdialog("please enter number of laps.");      numlaps = integer.parseint(input);      //frame creation     jframe f = new jframe("number of laps");     f.setsize(550, 450);     f.setdefaultcloseoperation(jframe.exit_on_close);     f.setlayout(null);      // label creation     jlabel label = new jlabel("you entered " + numlaps + " laps. press + add lap. press - subtract lap.", swingconstants.center);     label.setbounds(0,0,500,300);     f.add(label);     //display window      f.setvisible(true);       //button creation add     jbutton add = new jbutton ("+");     add.setbounds(350,250,50,50);     add.setpreferredsize(new dimension(50,50));     add.addactionlistener( new actionlistener()     {          @override         public void actionperformed(actionevent e) {             // happens when button pressed             //numlaps++;             addtolap();             system.out.println(numlaps);         }      });     f.add(add);    //button creation subtract         jbutton sub = new jbutton ("-");         sub.setbounds(100,250,50,50);         sub.setpreferredsize(new dimension(50,50));            sub.addactionlistener( new actionlistener()           {              @override             public void actionperformed(actionevent e) {                 // happens when button pressed                 //numlaps--;                 subtolap();                 system.out.println(numlaps);             }            });           f.add(sub); 

& add/sub methods:

private static void addtolap() {     // todo auto-generated method stub     numlaps++; } private static void subtolap() {     // todo auto-generated method stub     numlaps--; } 

you try following:

private int numlaps = 0 // or number want initialize 

then in methods should assing numlaps value jlabel this:

this.mylabel.settext(string.valueof(numlaps)); 

i hope helps.