java - Creating a timer and displaying it in a textbox (activated by a button) -

as far understand, should simple this, however, not errors, nor program run.

public class test extends applet implements actionlistener {   jtextfield tf = new jtextfield();   timer timer = new timer();   int counter = 30;    public void init() {   setlayout(null);   tf.setbounds(10,10,100,40);   tf.addactionlistener(this);   add(tf); }  public void actionperformed(actionevent e) {     timer.scheduleatfixedrate(new timertask() {           public void run() {             counter = counter - 1;           }         }, 2*60*1000, 2*60*1000);     tf.settext(""+counter); }  public static void main(string[] args) {   } } 

please, bear in mind complete beginner, , yes, did search around web while, before coming here help, , please, detailed possible..

any / criticism appreciated! thank in advance!

you have main() without code. app should initialized:

public static void main(string[] args) {     test app = new test();      app.init();  } 

otherwise test class never open.