Java Development

[PCaceres]

package Calc;

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.MenuItem;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;

public class Calculator extends UiApplication {

	public Calculator() {
		pushScreen(new Operaciones());
	}

	public static void main(String[] args) {
		Calculator app = new Calculator();
		app.enterEventDispatcher();
	}
}

final class Operaciones extends MainScreen implements FieldChangeListener{
	private ObjectChoiceField choiceField;
    private int select;
    private int a, b, r;
    
    BasicEditField N1;
    BasicEditField N2;
    BasicEditField R;
    ButtonField btnCalc;
	
        
    public Operaciones()
    {
         super();
         a = b = r = 0;
         
         LabelField title = new LabelField("Calculador Básico by PGCG.89",
                        					LabelField.ELLIPSIS | 
                        					LabelField.USE_ALL_WIDTH);
         setTitle(title); 
         
         add(new RichTextField("Ingrese dos números"));

         String choices[] = {"Sumar", "Restar", "Multiplicar", "Dividir"};
         choiceField = new ObjectChoiceField("Tipo Operación", choices);
         add(choiceField);     
                       
         N1 = new BasicEditField("N1: ", null, 20, Field.EDITABLE);
         N2 = new BasicEditField("N2: ", null, 20, Field.EDITABLE);
         R = new BasicEditField("", null, 50, Field.READONLY);
         btnCalc = new ButtonField("=");
              
         btnCalc.setChangeListener(this);
         
         add(new SeparatorField());
         add(N1);
         add(N2);
         add(new SeparatorField());
         add(btnCalc);         
         add(R);
    }
    
    public boolean onClose()
    {
         Dialog.alert("Goodbye!");
         System.exit(0);
         return true;
    }
    
    public void fieldChanged(Field field, int context) 
    {	
    	if (field == btnCalc)
    	{
    		select = choiceField.getSelectedIndex();
               
    		a = Integer.parseInt(N1.getText()); 
    		b = Integer.parseInt(N2.getText());
        
    		if (select == 0) 
    		{
    			r = a + b;    			
    			R.setText("La suma es: " + Integer.toString(r));             
    		} 
    		else if (select == 1) 
    		{
    			r = a - b;       	 		
       	 		R.setText("La resta es: " + Integer.toString(r));       	 		
    		} 
    		else if (select == 2) 
    		{
    			r = a * b;    			
    			R.setText("La multiplicación es: " + Integer.toString(r));    			
    		}
    		else if (select == 3) 
    		{    			
    			if (b != 0){ 
    				r = a / b;
    				R.setText("La división es: " + Integer.toString(r));    				
       			 }  		 
    			else
    				R.setText("División entre cero");            	 
    		}    
    	}
	}   

    //Create a menu item for BlackBerry device users to click to close the 
    //BlackBerry device application.
    private MenuItem _closeItem = new MenuItem("Close", 200000, 10) 
    {
         public void run()
         {
              onClose();
         }
    };

    //To add menu items to the menu of the BlackBerry device application, 
    //override the makeMenu method.
    protected void makeMenu( Menu menu, int instance )
    {         
         menu.add(_closeItem);
    }	 
}

[peter_strange]

Nice sample - thanks.