java - How to change the value of an integer by pressing a JButton? -


i'm making program everytime press jbutton decrease value of int. want make i decrease 20 each time button pressed. example:

    static int = 100;     static final int f = 20;      public static void main(string[] args) {         jpanel content = new jpanel();                   jbutton 1 = new jbutton("move 1");         jlabel label = new jlabel ("health: " + i);                  content.add(one);         content.add(label);                  one.addactionlistener(new actionlistener(){              public void actionperformed(actionevent e) {                     if(one.isselected()) {                                           = i-f ;                 }             }         });         jframe window = new jframe("fight!");          window.setcontentpane(content);          window.setsize(400,400);          window.setlocation(300,150);          window.setvisible(true);         window.setdefaultcloseoperation(jframe.exit_on_close);         window.repaint();            }

you have update text of jlabel explicitly:

if(one.isselected()) {    = i-f ;    label.settext("health: " + i); }

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