open one instance of JInternalFrame at one time using hash map

Question

I am creating MDI application in swing I want to use hash map to display one JInternalFrame at one time. I am unable pass keys and values. I am passining key as JInternalJframe name and value as object of JInternalJframe. I am unble to proceed. I have pasted incomplete code. To make you understand.

import java.util.*;
import javax.swing.*;

public class HashMap {
        static HashMap <String, JInternalFrame> myMap = new HashMap <>();
        //String(key) is the name of JInternalFrame
        //JInternalFrame(value) is name of object of JInternalFrame
        public static void main(String [] ashu){

        myMap.put("CityMaster",cm);
        myMap.put("TransportMaster",tm);
        myMap.put("AccountMaster",am);
        myMap.put("BankMaster",bm);

        for (String str: myMap.keySet()){
                System.out.println(str);
        }
        for (JInternalFrame jf: myMap.values()){
                System.out.println(jf);
        }
        }
}

I have created JInternalFrame named above as CityMaster,BankMaster, etc.

Answer 1

Try this out. Not much to explain. I just added some InternalFrames to a DesktopPane, as you should do. Disregard the setSize() everywhere. It was just for brevity, and my laziness. You shouldn't be using set size

import java.awt.BorderLayout;
import java.awt.event.*;
import java.beans.PropertyVetoException;
import java.util.*;
import java.util.logging.*;
import javax.swing.*;

public class HashMapFrame {

    Map<String, MyInternalFrame> iFrames;
    String[] keys = {"TransportMaster", "AccountMaster", "BankMaster",
                     "GrandMaster", "WebMaster", "StackOverflowMaster"};
    JDesktopPane desktop;
    JButton button = new JButton("Add Frame");
    int index = 0;
    int x = 0;
    int y = 0;

    public HashMapFrame() {
        desktop = new JDesktopPane();
        iFrames = new HashMap<>();
        for (String s : keys) {
            iFrames.put(s, new MyInternalFrame(s, x, y));
            x += 30;
            y += 30;
        }

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if (index < 6) {
                    desktop.add(iFrames.get(keys[index]));
                    iFrames.get(keys[index]).setVisible(true);
                    try {
                        iFrames.get(keys[index]).setSelected(true);
                    } catch (PropertyVetoException ex) {
                        Logger.getLogger(HashMapFrame.class.getName()).log(Level.SEVERE, null, ex);
                    }
                    index++;
                }
            }
        });

        JFrame frame = new JFrame();
        frame.add(desktop);
        frame.add(button, BorderLayout.PAGE_END);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(550, 550);
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new HashMapFrame();
            }
        });
    }
}

class MyInternalFrame extends JInternalFrame {

    public MyInternalFrame(String title, int x, int y) {
        super(title);

        setSize(300, 300);
        setLocation(x, y);
        setClosable(true);
    }
}