How can i be able to get the same LIST?

Question

im a newbei in java, and still studying about it. i hope i can ask some help from you all.^^
i really have a problem about my project, this program adds,searches and deletes the items inputted by the user. my problem is that, i cant make a connection between the objects added by the user to the searching class. i have different classes for adding, searching and deleting. the objects are first created in the adding class and the object must be present during the time when i start the searching class or even the delete class. i am using the LinkedList datastructure to search add and delete. and also i am using GUI for this project.
what should i do to build the connection between the objects and the other classes?
please help me. thank you for the time to reply to this post^^ i really appreciate it!

Answer 1

thank you CeciNEstPasUnProgrammeur , here i changed it and ther is no error:
     public Object post(Object o){
          for(Node node=first.getNext();node!=last;node=node.getNext()){
               if(o.equals(node.getData())){
                    Object aw = node.getData();
                    return aw;
          return null;
     }is the code valid?
here is the code for my Aadd class (the class for the adding of the inputs in the List), its not the final because i think there's something wrong with my codes, but i don't know what. Eventhough i already got the point on the connection between the object from another class to the class that would search, the output isn't diplayed.
I have a class Aresult(the class that displays the inputs of the user). even with the searching class no output from the adding of the inputs was produced. i wonder if it is the initialization of the objects, is it valid?
Sorry if the code is too long, i hope you woudn't mind.
here is a part of the code from the search class:
    public Sresult(String date) {
          setResizable(false);
        SresultLayout customLayout = new SresultLayout();
          dates = date;
          Aadd.aaddS.contains(dates);//<<<------- here is for the display
          if(Aadd.aaddS.contains(dates)==true){
               Aadd.aaddS.post(dates);
               String datess = Aadd.aaddS.post(dates).toString();
               setDate(datess);//<<<-- up to here
        getContentPane().setFont(new Font("Helvetica", Font.PLAIN, 12));
        getContentPane().setLayout(customLayout);
        ifevent = new JLabel("here are the found event/s in the date.");
        ifevent.setFont(new Font("Copperplate Gothic Bold", Font.BOLD,16));
        getContentPane().add(ifevent);
        resultevent = new JTextArea();
        sp_resultevent = new JScrollPane(resultevent);
        getContentPane().add(sp_resultevent);
        resultevent.setText(getDate());//<<<<---- for the string to appear in the JTextArea, but it doesn'tThere is no error from these codes but there is something wrong. can you please check it? thank you! i would really appreciate your help^^.
here is the code, but i cut the last part with the Layout class:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class Aadd extends JFrame {
    JLabel instructdate;
    JTextField inputdate;
    JScrollPane sp_inputdate;
    JLabel instructe;
    JTextField inpute;
    JScrollPane sp_inpute;
    JLabel instructn;
    JTextField inputn;
    JScrollPane sp_inputn;
    JButton cancelb;
    JButton exitb;
    JButton doneb;
    JLabel instructetitle;
    JTextField inputetitle;
    JLabel bgad;
    String dates;
    String events;
    String notes;
    String titles;
    static List aaddS = new LinkedList();<<<--- the use of static for searching
    List aaddBig = new LinkedList();
    public Aadd() {
          setResizable(false);
        AaddLayout customLayout = new AaddLayout();
        getContentPane().setFont(new Font("Helvetica", Font.PLAIN, 12));
        getContentPane().setLayout(customLayout);
        instructdate = new JLabel("input the date at the space below.");
        instructdate.setFont(new Font("Copperplate Gothic Bold", Font.BOLD,16));
        getContentPane().add(instructdate);
        inputdate = new JTextField("");
        sp_inputdate = new JScrollPane(inputdate);
        inputdate.addActionListener(new TextHandler());
        getContentPane().add(sp_inputdate);
        instructe = new JLabel("input the event at the space below.");
        instructe.setFont(new Font("Copperplate Gothic Bold", Font.BOLD,16));
        getContentPane().add(instructe);
        inpute = new JTextField("");
        sp_inpute = new JScrollPane(inpute);
        inpute.addActionListener(new TextHandler());
        getContentPane().add(sp_inpute);
        instructn = new JLabel("input the note at the space below.");
        instructn.setFont(new Font("Copperplate Gothic Bold", Font.BOLD,16));
        getContentPane().add(instructn);
        inputn = new JTextField("");
        sp_inputn = new JScrollPane(inputn);
        inputn.addActionListener(new TextHandler());
        getContentPane().add(sp_inputn);
        Icon cbpic = new ImageIcon("bgs/button-cancel.jpg");
        cancelb = new JButton(cbpic);
        cancelb.setActionCommand("cancel");
        cancelb.addActionListener(new ButtonHandler());
        getContentPane().add(cancelb);
        Icon ebpic = new ImageIcon("bgs/button-exit.jpg");
        exitb = new JButton(ebpic);
        exitb.setActionCommand("exit");
        exitb.addActionListener(new ButtonHandler());
        getContentPane().add(exitb);
        Icon dbpic = new ImageIcon("bgs/button-done.jpg");
        doneb = new JButton(dbpic);
        doneb.setActionCommand("done");
        doneb.addActionListener(new ButtonHandler());
        getContentPane().add(doneb);
        instructetitle = new JLabel("input the title of the event.");
        instructetitle.setFont(new Font("Copperplate Gothic Bold", Font.BOLD,16));
        getContentPane().add(instructetitle);
        inputetitle = new JTextField("");
        inputetitle.addActionListener(new TextHandler());
        getContentPane().add(inputetitle);
          int q=1+(int)(Math.random()*2);
          switch(q){
               case 1: Icon bgpic = new ImageIcon("bgs/bgf.jpg");
                           bgad = new JLabel(bgpic);
                       getContentPane().add(bgad);
                       break;
               case 2: Icon bgpic2 = new ImageIcon("bgs/bgf2.jpg");
                           bgad = new JLabel(bgpic2);
                       getContentPane().add(bgad);
                       break;
        setSize(getPreferredSize());
/*       addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
        pack();
        show();
  /*  public static void main(String args[]) {
        Aadd window = new Aadd();
        window.setTitle("Aadd");
        window.pack();
        window.show();
    class TextHandler implements ActionListener{   //<<<------- here to
          public void actionPerformed(ActionEvent e){
               if(e.getSource()==inputdate){
                    String date = "";
                    date = e.getActionCommand();
                    setDate(date);
                    aaddS.add(date);
               if(e.getSource()==inpute){
                    String event = "";
                    event = e.getActionCommand();
                    setEvent(event);
                    aaddS.add(event);
               if(e.getSource()==inputn){
                    String note = "";
                    note = e.getActionCommand();
                    setNote(note);
                    aaddS.add(note);
               if(e.getSource()==inputetitle){
                    String title = "";
                    title = e.getActionCommand();
                    setTitle(title);
                    aaddS.add(inputetitle); //<<<<<<--------- here is the forming of the objects.
    class ButtonHandler implements ActionListener{
          public void actionPerformed(ActionEvent e){
               if(e.getActionCommand().equals("done")){
                    hide();
                    Aresult ar = new Aresult(getDate(),getEvent(),getNote(),getTitle());
                    aaddBig.add(aaddS);
               //     out.writeObject(aaddBig);
               //     out.writeObject(aaddBig);
                    //put the IO here to save
               else if(e.getActionCommand().equals("cancel")){
                    hide();
                    Main ma = new Main();
               else if(e.getActionCommand().equals("exit")){
                    Option op = new Option();
     public void setDate(String d){
          dates = d;
     public void setEvent(String e){
          events = e;
     public void setNote(String n){
          notes = n;
     public void setTitle(String et){
          titles = et;
     public String getDate(){
          return dates;
     public String getEvent(){
          return events;
     public String getNote(){
          return notes;
     public String getTitle(){
          return titles;
}THANK YOU!^^