java - JPanel, instantiate an array of JButtons -

i having trouble putting panel class main class. can't seem instantiate , register buttons actionperformed method. project suppose use grid layout 9 input buttons (3 other buttons enter, space, , clear) display the input on jtextarea. believe have panel class set correctly, having problems putting jbutton array, , registering actionperformed method. pointers appreciated. (side question, how copy , paste code being taken in code block?)

import java.awt.dimension; import java.awt.gridlayout; import java.awt.event.actionevent; import java.awt.event.actionlistener; import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.jscrollpane; import javax.swing.jtextarea;  public class textbuttons extends jframe implements actionlistener {      private jbutton[] buttons;     private jtextarea textarea;     private final int enter;   //index of enter button in buttons     private final int space;    //index of space button in buttons     private final int clear;    //index of clear button in buttons      public textbuttons(string title) {         super(title);         jframe frame = new jframe("text button");          //todo: instantiate jbuttons, add them buttons array,         //  , register "this" actionlistener each button.          (int = 0; < buttons.length; i++) {             buttons[i] = new jbutton();             //this.buttons.addactionlistener(e);         }          enter = 9;         space = 10;         clear = 11;         buttons[enter] = new jbutton("\n");         buttons[space] = new jbutton(" ");         buttons[clear] = new jbutton("clear");          jtextarea textarea = new jtextarea();         textarea.seteditable(false);          textbuttonspanel mainpanel = new textbuttonspanel(buttons, textarea);          this.getcontentpane().add(mainpanel);         this.pack();         this.setvisible(true);     }      /* (non-javadoc)      * @see java.awt.event.actionlistener#actionperformed(java.awt.event.actionevent)      */     @override     public void actionperformed(actionevent e) {         // ??     }      public static void main(string[] args) {         final textbuttons f = new textbuttons("text buttons");         f.setdefaultcloseoperation(jframe.exit_on_close);         f.setlocationrelativeto(null);         f.setvisible(true);     } 

panelclass

    public class textbuttonspanel extends jpanel {          public textbuttonspanel(jbutton[] buttons, jtextarea textarea) {              int enter = 11;              jpanel mainpanel = new jpanel(new gridlayout(4, 3));              jbutton b1 = new jbutton("a");             jbutton b2 = new jbutton("b");             jbutton b3 = new jbutton("c");             jbutton b4 = new jbutton("1");             jbutton b5 = new jbutton("2");             jbutton b6 = new jbutton("3");             jbutton b7 = new jbutton("x");             jbutton b8 = new jbutton("y");             jbutton b9 = new jbutton("z");              add(b1);             mainpanel.add(b2);             mainpanel.add(b3);             mainpanel.add(b4);             mainpanel.add(b5);             mainpanel.add(b6);             mainpanel.add(b7);             mainpanel.add(b8);             mainpanel.add(b9);              jscrollpane scrollpane = new jscrollpane(textarea);             scrollpane.setpreferredsize(new dimension(80, 120));             mainpanel.add(scrollpane);         }     } } 

i can't seem instantiate , register buttons actionperformed method.

you organize code this:

import java.io.*; import java.awt.*; import java.awt.event.*; import javax.swing.*;  class textbuttonpanel extends jpanel implements actionlistener {      public textbuttonpanel(string[] labels) {         setlayout(new gridlayout(0, 3));  //same self.setlayout(..)          jbutton button;          (string label : labels) {             button = new jbutton(label);             button.addactionlistener(this);             add(button);  //same self.add(button)         }     }         public void actionperformed(actionevent e) {         jbutton button = (jbutton) e.getsource();         system.out.println(button.gettext());     }  }   class mygui {      public mygui() {         jframe frame = new jframe("name");         frame.setdefaultcloseoperation(jframe.dispose_on_close);         frame.setbounds(200, 100, 500, 300);         container cpane = frame.getcontentpane();          string[] labels = {"a", "b", "c", "d"};         textbuttonpanel panel = new textbuttonpanel(labels);         cpane.add(panel);          frame.setvisible(true);     } }    public class swingprog {     private static void createandshowgui() {         new mygui();     }      public static void main(string[] args) {         javax.swing.swingutilities.invokelater(new runnable() {             public void run() {                 createandshowgui();             }         });     } }