Отдельный класс для всех панелей - такое возможно?

package easybudda.examples.mypropertiesdialog;
 
import java.awt.Color;
 
public class MyProperties {
    private Color skin;
    private int growth;
    private int weight;
    
    public MyProperties(Color skin, int growth, int weight) {
        this.skin = skin;
        this.growth = growth;
        this.weight = weight;
    }
    
    public MyProperties(MyProperties another) {
        this.skin = another.getSkin();
        this.growth = another.getGrowth();
        this.weight = another.getWeight();
    }
    
    public void setSkin(Color skin) {
        this.skin = skin;
    }
    public Color getSkin() {
        return this.skin;
    }
    
    public void setGrowth(int growth) {
        this.growth = growth;
    }
    public int getGrowth() {
        return this.growth;
    }
    
    public void setWeight(int weight) {
        this.weight = weight;
    }
    public int getWeight() {
        return this.weight;
    }
    
    @Override
    public String toString() {
        String colorName;
        if ( this.skin == Color.WHITE )
            colorName = "White";
        else if ( this.skin == Color.BLACK )
            colorName = "Black";
        else
            colorName = "Yellow";
        
        return "Skin: " + colorName + ", Growth: " + this.growth + ", Weight: " + this.weight + ".";
    }
}

package easybudda.examples.mypropertiesdialog;
 
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
 
@SuppressWarnings("serial")
public class MyPropertiesPanel extends JPanel {
    MyProperties props;
 
    public MyPropertiesPanel(MyProperties p) {
        super(new FlowLayout());
        
        this.props = new MyProperties(p);
        
        JRadioButton skinColorWhite = new JRadioButton("White");
        JRadioButton skinColorBlack = new JRadioButton("Black");
        JRadioButton skinColorYellow = new JRadioButton("Yellow");
        
        if ( this.props.getSkin() == Color.WHITE )
            skinColorWhite.setSelected(true);
        else if ( this.props.getSkin() == Color.BLACK )
            skinColorBlack.setSelected(true);
        else
            skinColorYellow.setSelected(true);
        
        ButtonGroup skinColorGroup = new ButtonGroup();
        skinColorGroup.add(skinColorWhite);
        skinColorGroup.add(skinColorBlack);
        skinColorGroup.add(skinColorYellow);
        
        ActionListener skinColorListener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent colorEvent) {
                JRadioButton selected = (JRadioButton)colorEvent.getSource();
                switch ( selected.getText() ) {
                case "White" :
                    props.setSkin(Color.WHITE);
                    break;
                case "Black" :
                    props.setSkin(Color.BLACK);
                    break;
                case "Yellow" :
                    props.setSkin(Color.YELLOW);
                    break;
                }
            }
        };
        skinColorWhite.addActionListener(skinColorListener);
        skinColorBlack.addActionListener(skinColorListener);
        skinColorYellow.addActionListener(skinColorListener);
        
        
        String [] growthValues = new String [ 230 ];
        for ( int i = 0; i < growthValues.length; ++i )
            growthValues[i] = ( i + 1 ) + " cm";
        JComboBox<String> growthChooser = new JComboBox<>(growthValues);
        for ( int i = 0; i < growthValues.length; ++i )
            if ( ( i + 1 ) == props.getGrowth() )
                growthChooser.setSelectedIndex(i);
        growthChooser.addActionListener(new ActionListener() {
            @SuppressWarnings("unchecked")
            @Override
            public void actionPerformed(ActionEvent growthEvent) {
                JComboBox<String> chooser = (JComboBox<String>)growthEvent.getSource();
                props.setGrowth(chooser.getSelectedIndex() + 1);
            }
        });
        
        
        JSlider weightSlider = new JSlider(JSlider.HORIZONTAL, 1, 300, props.getWeight());
        weightSlider.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent weightEvent) {
                JSlider slider = (JSlider)weightEvent.getSource();
                props.setWeight(slider.getValue());
            }
        });
        
        
        this.add(new JLabel("Skin color: "));
        this.add(skinColorWhite);
        this.add(skinColorBlack);
        this.add(skinColorYellow);
        this.add(new JLabel("Growth: "));
        this.add(growthChooser);
        this.add(new JLabel("Weight: "));
        this.add(weightSlider);
    }
    
    public MyProperties getProperties() {
        return this.props;
    }
}

package easybudda.examples.mypropertiesdialog;
 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class MyPropertiesTester {
    private MyProperties props;
    private JLabel propsLabel;
    private JFrame mainFrame;
    
    public MyPropertiesTester() {
        props = new MyProperties(Color.WHITE, 180, 200);
        
        propsLabel = new JLabel("Current properties: " + props.toString());
        
        mainFrame = new JFrame("MyPropertiesTester");
        mainFrame.setLayout(new FlowLayout());
        mainFrame.setSize(500, 100);
        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        mainFrame.add(propsLabel);
        
        JButton changePropsButton = new JButton("Change");
        changePropsButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                MyPropertiesPanel propsPanel = new MyPropertiesPanel(props);
                if ( JOptionPane.showOptionDialog(mainFrame, propsPanel, "Change Properties", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE, null, null, null) == JOptionPane.OK_OPTION ) {
                    props = propsPanel.getProperties();
                    propsLabel.setText("Current properties: " + props.toString());
                }
            }
        });
        mainFrame.add(changePropsButton);
        
        mainFrame.setVisible(true);
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new MyPropertiesTester();
            }
        });
    }
}