java - Action listener on comboBox to display selection in textField -

i have combobox contains selections. trying apply actionlistener display te selected string on textfield. not sure how complete , have read confusing me more.

here code combobox:

jcombobox combobox = new jcombobox();         combobox.setmodel(new defaultcomboboxmodel(new string[] {"select something", "selection 1", "selection 2", "selection 3", "selection 4"}));         paneltop.add(combobox);         combobox.setpreferredsize(new dimension(160, 20));         combobox.additem("select something"); 

textfield code:

textfield = new jtextfield();         paneltop.add(textfield);         textfield.setcolumns(40); 

what have far on actionlistener:

public void actionperformed(actionevent e) {             jcombobox combobox = (jcombobox)e.getsource();             string newselection = (string)combobox.getselecteditem();             currentpattern = newselection;          } 

full code:

package swingassign2;  import java.awt.dimension; import java.awt.eventqueue;  import javax.swing.borderfactory; import javax.swing.jframe; import javax.swing.jlabel; import javax.swing.jpanel; import javax.swing.jscrollpane; import javax.swing.jtextpane;  import java.awt.borderlayout;  import javax.swing.jcombobox; import javax.swing.jtextfield;  import java.awt.flowlayout;  import javax.swing.swingconstants;  import java.awt.gridlayout; import java.awt.event.actionevent; import java.awt.event.itemevent; import java.awt.event.itemlistener;  import javax.swing.defaultcomboboxmodel;  public class swingassign2 {      private jframe frame;     private jtextfield textfield;      /**      * launch application.      */     public static void main(string[] args) {         eventqueue.invokelater(new runnable() {             public void run() {                 try {                     swingassign2 window = new swingassign2();                     window.frame.setvisible(true);                 } catch (exception e) {                     e.printstacktrace();                 }             }         });     }      /**      * create application.      */     public swingassign2() {         initialize();     }      /**      * initialize contents of frame.      */     private void initialize() {         frame = new jframe();         frame.setsize(600, 500);         frame.setdefaultcloseoperation(jframe.exit_on_close);          jpanel paneltop = new jpanel();         flowlayout fl_paneltop = (flowlayout) paneltop.getlayout();         fl_paneltop.setalignment(flowlayout.left);         frame.getcontentpane().add(paneltop, borderlayout.north);         //panel.setlayout(new flowlayout(flowlayout.left, 5, 5));          final jcombobox combobox = new jcombobox();         combobox.setmodel(new defaultcomboboxmodel(new string[] {"select something", "selection 1", "selection 2", "selection 3", "selection 4"}));         paneltop.add(combobox);         combobox.setpreferredsize(new dimension(160, 20));         combobox.additem("select something");           textfield = new jtextfield();         paneltop.add(textfield);         textfield.setcolumns(40);          jpanel panelbottom = new jpanel();         frame.getcontentpane().add(panelbottom, borderlayout.south);         panelbottom.setlayout(new borderlayout(0, 0));          jlabel status = new jlabel("status");         status.sethorizontalalignment(swingconstants.center);         panelbottom.add(status, borderlayout.south);         status.setborder(borderfactory.createloweredbevelborder());          jtextpane txtpnsomecontenton_b = new jtextpane();         txtpnsomecontenton_b.settext("some content on bottom panel\r\nmore content\r\nsome more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content");         jscrollpane jscrollpane3 = new jscrollpane(txtpnsomecontenton_b);         jscrollpane3.sethorizontalscrollbarpolicy(                 jscrollpane.horizontal_scrollbar_always);         jscrollpane3.setverticalscrollbarpolicy(                 jscrollpane.vertical_scrollbar_always);         panelbottom.add(jscrollpane3, borderlayout.north);         jscrollpane3.setpreferredsize(new dimension(200, 200));         //btext.setborder(borderfactory.createloweredbevelborder());          jpanel panelcenter = new jpanel();         frame.getcontentpane().add(panelcenter, borderlayout.center);         panelcenter.setlayout(new gridlayout(0, 2, 0, 0));          jtextpane txtpnsomecontenton_0 = new jtextpane();         txtpnsomecontenton_0.settext("some content on left panel\r\nmore content\r\nsome more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content");         jscrollpane jscrollpane1 = new jscrollpane(txtpnsomecontenton_0);         jscrollpane1.sethorizontalscrollbarpolicy(                 jscrollpane.horizontal_scrollbar_always);         jscrollpane1.setverticalscrollbarpolicy(                 jscrollpane.vertical_scrollbar_always);         panelcenter.add(jscrollpane1);          jtextpane txtpnsomecontenton = new jtextpane();         txtpnsomecontenton.settext("some content on right panel\r\nmore content\r\nsome more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content\r\nmore , more content");         jscrollpane jscrollpane2 = new jscrollpane(txtpnsomecontenton);         jscrollpane2.sethorizontalscrollbarpolicy(                 jscrollpane.horizontal_scrollbar_always);         jscrollpane2.setverticalscrollbarpolicy(                 jscrollpane.vertical_scrollbar_always);         panelcenter.add(jscrollpane2);          combobox.additemlistener(new itemlistener() {             @override             public void itemstatechanged(itemevent e) {                 if(e.getstatechange() == itemevent.selected) {                     textfield.settext((string) combobox.getselecteditem());                 }             }         });       }  } 

consider adding itemlistener jcombobox , checking itemevent state itemevent.selected. can set text field's text in itemstatechanged method:

combobox.additemlistener(new itemlistener() {     @override     public void itemstatechanged(itemevent e) {         if(e.getstatechange() == itemevent.selected) {             textfield.settext((string) combobox.getselecteditem());         }     } });