Aplikasi Konversi Suhu dengan J2ME

konverter.java

/*
 *@ author Resa C.R 
 */

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class konverter extends MIDlet implements CommandListener
{
	private Display tampil;
	private Alert peringatan;
	private Form formIsi,formHasil;
	private StringItem sCelcius,sFahrenheit,sReamur,sHasilCelcius,sHasilFahrenheit,sHasilReamur;
	private TextField txtCelcius,txtFahrenheit,txtReamur;
	Command comKeluar,comHitung,comKembali;
	
	public konverter()
	{
		sCelcius = new StringItem("","Celcius",StringItem.PLAIN);
		txtCelcius = new TextField("","",20,TextField.NUMERIC);
		
		sFahrenheit = new StringItem("","Fahrenheit",StringItem.PLAIN);
		txtFahrenheit = new TextField("","",20,TextField.NUMERIC);
		
		sReamur = new StringItem("","Reamur",StringItem.PLAIN);
		txtReamur = new TextField("","",20,TextField.NUMERIC);
		
		comHitung = new Command("Hitung",Command.OK,0);
		comKeluar = new Command("Keluar",Command.EXIT,1);
		
		
	}
	
	public void startApp()
	{
		tampil = Display.getDisplay(this);
		formIsi = new Form("Konversi Suhu V.01b");
		formIsi.append(sCelcius);
		formIsi.append(txtCelcius);
		formIsi.append(sFahrenheit);
		formIsi.append(txtFahrenheit);
		formIsi.append(sReamur);
		formIsi.append(txtReamur);
		formIsi.addCommand(comHitung);
		formIsi.addCommand(comKeluar);
		formIsi.setCommandListener(this);
		tampil.setCurrent(formIsi);
	}
	
	public void hitungCelcius()
	{
		formHasil = new Form("Hasil Konversi");
		double celcius = Double.parseDouble(txtCelcius.getString());
		double fahrenheit = (celcius * 1.8) + 32;
		double reamur = celcius * 0.8;
		
		sHasilFahrenheit = new StringItem("","",StringItem.PLAIN);
		sHasilFahrenheit.setText("Konversi Celcius--->Fahrenheit : " + fahrenheit);
		
		sHasilReamur = new StringItem("","",StringItem.PLAIN);
		sHasilReamur.setText("Konversi Celcius--->Reamur : " + reamur);
		
		comKembali = new Command("Kembali",Command.BACK,1);
		comKeluar = new Command("Keluar",Command.EXIT,0);
		
		formHasil.append(sHasilFahrenheit);
		formHasil.append(sHasilReamur);
		formHasil.addCommand(comKembali);
		formHasil.addCommand(comKeluar);
		formHasil.setCommandListener(this);
		tampil.setCurrent(formHasil);
	}
	
	public void hitungFahrenheit()
	{
		Form formHasil = new Form("Hasil Konversi");
		double fahrenheit = Double.parseDouble(txtFahrenheit.getString());
		double celcius = (fahrenheit - 32) / 1.8;
		double reamur = (fahrenheit - 32) / 2.25;
		
		StringItem sHasilCelcius = new StringItem("","",StringItem.PLAIN);
		sHasilCelcius.setText("Konversi Fahrenheit--->Celcius : " + celcius);
		StringItem sHasilReamur = new StringItem("","",StringItem.PLAIN);
		sHasilReamur.setText("Konversi Fahrenheit--->Reamur : " + reamur);
		
		comKembali = new Command("Kembali",Command.BACK,1);
		comKeluar = new Command("Keluar",Command.EXIT,0);
		
		formHasil.append(sHasilCelcius);
		formHasil.append(sHasilReamur);
		
		formHasil.addCommand(comKembali);
		formHasil.addCommand(comKeluar);
		formHasil.setCommandListener(this);
		
		tampil.setCurrent(formHasil);
	}
	
	public void hitungReamur()
	{
		Form formHasil = new Form("Hasil Konversi");
		double reamur = Double.parseDouble(txtReamur.getString());
		double celcius = reamur / 0.8;
		double fahrenheit = reamur * 2.25 + 32;
		
		StringItem sHasilCelcius = new StringItem("","",StringItem.PLAIN);
		sHasilCelcius.setText("Konversi Reamur--->Celcius : " + celcius);
		StringItem sHasilFahrenheit = new StringItem("","",StringItem.PLAIN);
		sHasilFahrenheit.setText("Konversi Reamur--->Fahrenheit : " + fahrenheit);
		
		comKembali = new Command("Kembali",Command.BACK,1);
		comKeluar = new Command("Keluar",Command.EXIT,0);
		
		formHasil.append(sHasilCelcius);
		formHasil.append(sHasilFahrenheit);
		formHasil.addCommand(comKembali);
		formHasil.addCommand(comKeluar);
		formHasil.setCommandListener(this);
		
		tampil.setCurrent(formHasil);
	}
	
	public void Peringatan()
	{
		peringatan = new Alert("Pesan Kesalahan","Isi salah satu TextField",null,AlertType.INFO);
		tampil.setCurrent(peringatan,formIsi);
	}
	
	public void pauseApp()
	{
	}
	
	public void destroyApp(boolean unconditional)
	{
		notifyDestroyed();
	}
	
	public void commandAction(Command com,Displayable dsp)
	{
		if(dsp == formIsi)
		{
			if(com == comHitung)
			{
				if((!txtCelcius.getString().equals("")) && 
					(txtFahrenheit.getString().equals("")) && (txtReamur.getString().equals("")))
					{
						hitungCelcius();
					}
				else if((!txtFahrenheit.getString().equals("")) && 
						(txtCelcius.getString().equals("")) && (txtReamur.getString().equals("")))
						{
							hitungFahrenheit();
						}
				else if((!txtReamur.getString().equals("")) && 
						(txtCelcius.getString().equals("")) && (txtFahrenheit.getString().equals("")))
						{
							hitungReamur();
						}
				else
				{
					Peringatan();
				}
			}
			else if(com == comKeluar)
			{
				destroyApp(true);
				notifyDestroyed();
			}
		
		}
		
		else
		{
			if(com == comKembali)
			{
				tampil.setCurrent(formIsi);
			}	
			else if(com == comKeluar)
			{
				destroyApp(true);
				notifyDestroyed();
			}
		}
	}
	
	
	
}