Fórum Calculadora usando JOptionPane - Ajuda #567112

JOptionPane.showMessageDialog(null,"O resultado e :" +resultado,"Resultado", JOptionPane.INFORMATION_MESSAGE);

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;

public class OptionDialogTeste {

	public static void main(String[] args) {

		OptionDialogFrame frame = new OptionDialogFrame();
		frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
		frame.setVisible( true );
		
	}

}

/**
 * Um painel com botões de seleção dentro de uma borda com título;
 */

class ButtonPanel extends JPanel{
	
	public ButtonPanel( String titulo, String[] opcoes ){
		
		setBorder( BorderFactory.createTitledBorder( BorderFactory.createEtchedBorder(), titulo ) );
		setLayout( new BoxLayout( this, BoxLayout.Y_AXIS ) );
		group = new ButtonGroup();
		
		for( int i = 0; i < opcoes.length; i++ ){
			JRadioButton b = new JRadioButton( opcoes[i] );
			b.setActionCommand( opcoes[i] );
			add( b );
			group.add( b );
			b.setSelected( i == 0 );
			
		}
		
	}
	
	/**
	 * Obtem a opção selecionada no momento;
	 * @return retorna o rótulo do botão de seleção marcado no momento
	 */
	
	public String getSelection(){
		return group.getSelection().getActionCommand();
	}
	
	private ButtonGroup group;
	
}

/**
 * Um Frame que contém configurações para selecionar várias caixas de diálogo de opção;
*/

class OptionDialogFrame extends JFrame{
	
	public OptionDialogFrame(){
		
		setTitle("OptionDialogTeste");
		setSize( DEFAULT_WIDTH, DEFAULT_HEIGHT );
		
		JPanel gridPanel = new JPanel();
		gridPanel.setLayout( new GridLayout( 2, 3 ) );
		
		typePanel = new ButtonPanel("Type", new String[] { "Message", "Confirm", "Option", "Input"} );
		messageTypePanel = new ButtonPanel("Message Type", new String[] { "ERROR_MESSAGE", "INFORMATION_MESSAGE", "WARNING_MESSAGE", "QUESTION_MESSAGE", "PLAIN_MESSAGE" } );
		messagePanel = new ButtonPanel("Message", new String[] { "String","Icon","Component","Other","Object[]" } );
		optionTypePanel = new ButtonPanel("Confirm", new String[] { "DEFAULT_OPTION", "YES_NO_OPTION", "YES_NO_CANCEL_OPTION", "OK_CANCEL_OPTION" } );
		optionsPanel = new ButtonPanel("Option", new String[]{ "String[]", "Icon[]", "Object[]" } );
		inputPanel = new ButtonPanel("Input", new String[] { "Text field", "Combo box" } );
		
		gridPanel.add( typePanel );
		gridPanel.add( messageTypePanel );
		gridPanel.add( messagePanel );
		gridPanel.add( optionTypePanel );
		gridPanel.add( optionsPanel );
		gridPanel.add( inputPanel );
		
		JPanel showPanel = new JPanel();
		JButton showButton = new JButton("Show");
		
		showButton.addActionListener( new ShowAction() );
			
		showPanel.add( showButton );
		
		add( gridPanel, BorderLayout.CENTER );
		add( showPanel, BorderLayout.SOUTH );
		
	}
	
	public Object getMessage(){
		
		String s = messagePanel.getSelection();
		
		if( s.equals("String"))
			return messageString;
		else if( s.equals("Icon"))
			return messageIcon;
		else if( s.equals("Component"))
			return messageComponent;
		else if( s.equals("Object[]"))
			return new Object[]{ messageString, messageIcon, messageComponent, messageObject };
		else if( s.equals("Other"))
			return messageObject;
		else return null;		
		
	}
	
	public Object[] getOptions(){
		
		String s = optionsPanel.getSelection();
		if( s.equals("String[]"))
			return new String[] { "Yellow","Blue","Red" };
		else if( s.equals("Icon[]"))
			return new Icon[] {
				new ImageIcon("yellow-ball.gif"),
				new ImageIcon("blue-ball.gif"),
				new ImageIcon("red-ball.gif")
		};
		else if ( s.equals( "Object[]" ) )
			return new Object[]{
				messageString, messageIcon, messageComponent, messageObject
		};
		else
			return null;
		
	}
	
	public int getType( ButtonPanel panel ){
		
		String s = panel.getSelection();
		
		try{
			return JOptionPane.class.getField(s).getInt(null);
		}
		catch( Exception e )
		{
			return -1;
		}
		
	}
	
	private class ShowAction implements ActionListener{
		
		public void actionPerformed( ActionEvent event){
			
			if( typePanel.getSelection().equals("Confirm") )
				JOptionPane.showConfirmDialog( OptionDialogFrame.this, getMessage(), "Titulo", getType( optionTypePanel), getType( messageTypePanel ) );
			else if( typePanel.getSelection().equals("Input") )
			{
				if( inputPanel.getSelection().equals("Text field") )
					JOptionPane.showInputDialog( OptionDialogFrame.this, getMessage(), "Titulo", getType( messageTypePanel ) );
				else
					JOptionPane.showInputDialog( OptionDialogFrame.this, getMessage(), "Titulo", getType( messageTypePanel), null, new String[] { "Yelloy", "Blue", "Red" }, "Blue" );
			}
			else if( typePanel.getSelection().equals("Message") )
				JOptionPane.showMessageDialog( OptionDialogFrame.this, getMessage(), "Titulo", getType( messageTypePanel ) );
			else if( typePanel.getSelection().equals("Option") )
				JOptionPane.showOptionDialog( OptionDialogFrame.this, getMessage(), "Titulo", getType( optionTypePanel), getType( messageTypePanel), null, getOptions(), getOptions()[0] );
			
		}
	}
	
	private ButtonPanel typePanel;
	private ButtonPanel messageTypePanel;
	private ButtonPanel messagePanel;
	private ButtonPanel optionTypePanel;
	private ButtonPanel optionsPanel;
	private ButtonPanel inputPanel;
	
	private String messageString = "Message";
	private Icon messageIcon = new ImageIcon("blue-ball.gif");
	private Object messageObject = new Date();
	private Component messageComponent = new SamplePanel();
		
	public final static int DEFAULT_WIDTH = 600;
	public final static int DEFAULT_HEIGHT = 400;
	
}

class SamplePanel extends JPanel{
	
	public  void paintComponent( Graphics g ){
		
		super.paintComponent(g);
		Graphics2D g2 = ( Graphics2D ) g;
		
		Rectangle2D rect = new Rectangle2D.Double( 0, 0, getWidth() - 1, getHeight() - 1 );
		g2.setPaint( Color.YELLOW );
		g2.fill( rect );
		g2.setPaint( Color.BLUE );
		g2.draw( rect );
		
	}
	
	public Dimension getMininumSize(){
		return new Dimension( 10, 10 );
	}
	
}