Vfrdtyky

I am doing some basic tests to understand how Java Swing works.

I have a test application which consist of three fully independent windows (JFrames):

1. Main Menu


2. Asset Window 1


3. Asset Window 2

The Main Menu has a JButton which will show/hide Asset Window 1 (a1).

This is the main class to launch all windows:

package test1;



import test1.AssetList.AssetList;

import test1.MainMenu.MainMenu;

import javax.swing.*;



public class Test1 {



    public static void main(String args) {

        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                MainMenu m = new MainMenu();

                AssetList a1 = new AssetList();

                AssetList a2 = new AssetList();

            }

        });

    }

}

This is the class with the Asset Window JFrame:

package test1.AssetList;



import javax.swing.*;



public class AssetList extends JFrame {



    public AssetList() {



        JLabel label = new JLabel("Asset list");

        this.getContentPane().add(label);



        this.pack();

        this.setVisible(false);



    }



}

This is the class for the MainMenu JFrame:

package test1.MainMenu;



import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JButton;



public class MainMenu extends JFrame {



    JLabel label = new JLabel("Main Menu");

    JButton button = new JButton("Asset");  



    public MainMenu() {

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



        this.getContentPane().add(label);

        this.getContentPane().add(button);



        button.addActionListener(new ButtonAssetListener());



        this.pack();

        this.setVisible(true);



    }



}

This is the class for the Asset Window Button JButton listener:

package test1.MainMenu;



import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;



public class ButtonAssetListener implements ActionListener{



    @Override

    public void actionPerformed(ActionEvent evt) {



        System.out.println("CLICK!");

        /* PSEUDOCODE

        if(a1 from Test1.isVisible()==true) {

           a1 from Test1.setVisible(false);

        } else {

            a1 from Test1.setVisible(true);

        }

        */

    }



}

How can I retrieve the a1 instance from ButtonAssetListener in order to toggle its visibility?
Is there a better alternative to structure this kind of multiple windows application in Java Swing?

You can just pass the instance you want to hide to the button listener.

public class Test1 {



    public static void main(String args) {

        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                AssetList a1 = new AssetList();

                AssetList a2 = new AssetList();

                MainMenu m = new MainMenu(a1);

            }

        });

    }

}

Make your main menu take in a component which it will show and hide.

public class MainMenu extends JFrame {



    JLabel label = new JLabel("Main Menu");

    JButton button = new JButton("Asset");  



    public MainMenu(JComponent assetList) {

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



        this.getContentPane().add(label);

        this.getContentPane().add(button);



        button.addActionListener(new ButtonAssetListener(assetList));



        this.pack();

        this.setVisible(true);



    }



}

Then modify your your button asset listener to take in a component which it will then show or hide.

public class ButtonAssetListener implements ActionListener{



    private JComponent component;



    public ButtonAssetListener(JComponent component) {

        this.component = component;

    }



    @Override

    public void actionPerformed(ActionEvent evt) {

        if(component.isVisible()) {

           component.setVisible(false);

        } else {

            component.setVisible(true);

        }

    }

}