java - How do I display numbers in JTextField after tap on any number from calculator? -

i know should use "actionlistener", suppose below code should work doesn't.

if (e.getsource() == "but0") { // but0 name of button number "0"     string aaa = but0.gettext();     field.settext(aaa); } 

add button in array when creating it

arraylist<jbutton> buttona = new arraylist(); for(int i=0;i<=9;i++) {  string num_ = string.valueof(i);  jbutton button = new jbutton(num_);  button.setname(num_);  buttona.add(button);   // remaining stuff } 

in action

 public void actionperformed(actionevent e) {    if(buttona.contains(e.getsource())) {             jbutton btn = (jbutton) e.getsource();             display.settext(display.gettext() + btn.getname());    } else if() { // operations +,- etc.,     }