Question

Ok guys, I’ve made some changes in my code as told by you. I have 3 classes:

The second class (and first GUI): I have 4 JButtons – Simulare, CazParticular, Start and HandSelection, some JLabels and 3 JTextFields; When I press the HandSelection button another frame it’s created with different content.

The 3rd class (and second GUI): I have 2 JButtons – Ok and Cancel and other stuff. When I press the Ok button I want to the access to the JTextField(QuesHandText) from the first Gui and use the method setText(). I can’t figure this out, I’m thinking on this like 4-5 days and still can’t get the answer. Please help me!

What code should I write in if statement to be able to modify the text in the JTextField from 2nd class (first GUI) ?

First class:

import javax.swing.JFrame;
public class Main {

    public static void main(String[] args){

        //other stuff
        GuiMain gui = new GuiMain();

        gui.frame1.setLocation(150,150);
        gui.frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        gui.frame1.setSize(400,250);
        gui.frame1.setResizable(false);
        gui.frame1.setVisible(true);

        //other stuff
    }
}

Second class:

import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowEvent;
import javax.swing.*;

public class GuiMain {

    public static GuiMain instance;
public static GuiMain getInstance(){
    if(GuiMain.instance == null){GuiMain.instance = new GuiMain();}
    return GuiMain.instance;
}
    public JFrame frame1 = new JFrame();

    public JTextField QuesHandText, FlopTurnRiverText, RezultatText; 
    public JButton Simulare, CazParticular, Start, HandSelection;
    public int w1,h1;
    public JLabel someText;
    static int u=0;
    public int j=0;

    public GuiMain(){

        frame1.setTitle("HoldemTool");
        frame1.setLayout(null);
        QuesHandText = new JTextField(4);

        Simulare = new JButton("Simulare");
        CazParticular = new JButton("Caz particular");
        Start = new JButton("Start");
        HandSelection = new JButton(new ImageIcon(getClass().getResource("GuiPic.png")));
        Handler handler1 = new Handler();

        CazParticular.addActionListener(handler1);
        Simulare.addActionListener(handler1);

        HandSelection.addActionListener(handler1);
        Start.addActionListener(handler1);

        QuesHandText.setEditable(false);
        FlopTurnRiverText.setEditable(false);
        RezultatText.setEditable(false);

        frame1.add(Welcome1);
        frame1.add(Welcome2);
        frame1.add(QuesHand);
        frame1.add(FlopTurnRiver);
        frame1.add(Rezultat);
        frame1.add(QuesHandText);
        frame1.add(FlopTurnRiverText);
        frame1.add(RezultatText);
        frame1.add(Simulare);
        frame1.add(CazParticular);
        frame1.add(Start);

    }

    public JTextField getQuesHandText(){
    return QuesHandText;
}
    public class Handler implements ActionListener{
        public void actionPerformed(ActionEvent e){

            if(e.getSource()==Simulare)
            {

            }
            if(e.getSource()==CazParticular){
                QuesHandText.setEditable(true);
                FlopTurnRiverText.setEditable(true);

                QuesHandText.setText("");
                FlopTurnRiverText.setText("");
                RezultatText.setText("");

                frame1.setSize(470, 250);
                Start.setBounds(3*FlopTurnRiverText.getX(), QuesHand.getY(), 65, h1);
                HandSelection.setBounds(3*FlopTurnRiverText.getX(), FlopTurnRiverText.getY(), 65, h1);

                frame1.add(HandSelection);
                frame1.add(Start);
            }
            if(e.getSource()==Start){
                QuesHandText.setText("Text");
            }
            if(e.getSource()==HandSelection){
                GuiSelection gui2 = new GuiSelection();  
                gui2.frame2.setVisible(true);
            }
        }

    }}

3rd class

import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowEvent;
import javax.swing.*;

public class GuiSelection extends GuiMain {

    JFrame frame2 = new JFrame();
    GuiMain guiMain;
    public JButton Ok,Cancel;

    //other stuff

    public GuiSelection(){
        guiMain = new GuiMain();
        frame2.setTitle("Hand selection");
        frame2.setSize(1135,535);
        frame2.setLayout(null);
        frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame2.setVisible(true);
        frame2.setResizable(false);

        //other stuff

        Handler2 handler2 = new Handler2();

        Ok.addActionListener(handler2);
        Cancel.addActionListener(handler2);

        frame2.add(Ok); frame2.add(Cancel); 

    }

    public class Handler2 implements ActionListener{
        public void actionPerformed(ActionEvent e){
            if(e.getSource()==Cancel){
                frame2.hide();
            }
            if(e.getSource()==Ok)
            {
            GuiMain.getInstance().getQuesHandText().setText("From Ok");

                //When I prees this button "Ok" I want to get access to the JTextField(QuesHandText) in the         GuiMain class, and .setText();
                //somothing like QuesHandtText.setText("someText");
            }
        }
    }
}

Answer 1

Add to your first GUI the method public JTextField getQuesHandText() and a static method public static JFrame getInstance() which returns the instance of the first GUI. Now you can call SecondClass.getInstance().getQuesHandText() from anywhere to get the JTextField instance. Note that with this method you can only have a single instance of SecondClass at any time.

Your getInstance() method will look as follows:

public class SecondClass extends JFrame {

    private static SecondClass instance;

    public static SecondClass getInstance() {
        if(SecondClass.instance == null)
            SecondClass.instance = new SecondClass();

        return SecondClass.instance
    }

}

Note that you shouldn’t create an instance of SecondClass manually.