swing - Java EventHandler not working, why does it create new Frame? -

i trying create address book uni project , trying gui able save details input form file. every time click save on gui creates new frame rather executing code have put in handler. still new java , can't see wrong it.

import java.io.bufferedwriter; import java.io.file; import java.io.filewriter; import java.io.ioexception; import java.io.printwriter;   public class addressbook {   static addressbookgui addressbookgui = new addressbookgui();  static int writecount;  file detailsfile = new file("customerdetails.txt");   public static void savedetails() throws ioexception {      string title = addressbookgui.txttitle.gettext();      filewriter fw = new filewriter("customerdetails.txt");     bufferedwriter bw = new bufferedwriter(fw);     printwriter out = new printwriter(bw);      out.println(title);       out.close();      writecount++;     }  } 

above handler class, below gui.

import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.io.ioexception;  import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jlabel; import javax.swing.joptionpane; import javax.swing.jpanel; import javax.swing.jtextfield;   public class addressbookgui {  private jlabel lbltitle; public jtextfield txttitle; private jbutton btnsavedetails; private jpanel panel; private jframe frame;  public static void main(string[] args) {     new addressbookgui(); }  public addressbookgui() {      createpanel();     addlabels();     addtextfields();     addbuttons();      frame.add(panel);     frame.setvisible(true); }  public void createpanel() {      frame = new jframe();     frame.settitle("address book");     frame.setdefaultcloseoperation(jframe.exit_on_close);     frame.setsize(800,950);     frame.setvisible(true);      panel = new jpanel();     panel.setlayout(null); }  public void addlabels() {      lbltitle = new jlabel("title");     lbltitle.setbounds(90,210,140,30);     panel.add(lbltitle);  }  public void addtextfields() {      txttitle = new jtextfield("");     txttitle.setbounds(190,210,150,30);     panel.add(txttitle);  } public void addbuttons() {      btnsavedetails = new jbutton("save");     btnsavedetails.setbounds(200,600,80,30);     btnsavedetails.addactionlistener(new savedetailsbutton());     panel.add(btnsavedetails);  }   public class savedetailsbutton implements actionlistener {     public void actionperformed(actionevent event) {          try {             addressbook.savedetails();         } catch (ioexception e) {             joptionpane.showmessagedialog(null, "file did not write correctly.", "error", joptionpane.error_message);         }     }  }  } 

thanks in advance.