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package mobileapplicationb;

    import java.util.Random;
    import javax.microedition.lcdui.Command;
    import javax.microedition.lcdui.CommandListener;
    import javax.microedition.lcdui.Display;
    import javax.microedition.lcdui.Displayable;
    import javax.microedition.lcdui.Form;
    import javax.microedition.lcdui.StringItem;
    import javax.microedition.lcdui.TextField;
    import javax.microedition.midlet.*;

public class Midlet extends MIDlet implements CommandListener{

        private Form okno;
        private Command cmdAgain;
        private Command cmdKoniec;
        private int licznik = 0;
        private TextField licz;
        private StringItem cmdAgainLabel = new StringItem("Generuj","");
        private StringItem siTablica =
        new StringItem("Tablica:\n","brak elementów");
        private StringItem siMin = new StringItem("","");
        private StringItem siMax = new StringItem("","");
        private StringItem siSum = new StringItem("","");
        private StringItem siAvg = new StringItem("","");
    public Midlet() {
        okno = new Form("Losowe wypełnianie tablicy");
        cmdAgain = new Command(cmdAgainLabel.getLabel(), Command.ITEM, 0);
        cmdKoniec = new Command("Koniec",Command.EXIT, 0);
        licz = new TextField("Podaj liczbę elementów", null, 5,
        TextField.DECIMAL);
        okno.append(licz);
    }
        protected void destroyApp(boolean u) throws MIDletStateChangeException
        {
        }
            protected void pauseApp() {
            }
    protected void startApp() throws MIDletStateChangeException {
        Display ekran = Display.getDisplay(this);
        ekran.setCurrent(okno);
        okno.addCommand(cmdAgain);
        okno.addCommand(cmdKoniec);
        okno.setCommandListener(this);
        okno.append(siTablica);
        okno.append(siMin);
        okno.append(siMax);
        okno.append(siSum);
        okno.append(siAvg);
    }
    public void commandAction(Command cmd, Displayable s) {
        if(cmd == cmdAgain) {
            if(licznik == 0) {
                cmdAgainLabel.setLabel("Powtórz");
                okno.removeCommand(cmdAgain);
                cmdAgain = new Command(cmdAgainLabel.getLabel(), Command.ITEM, 0);
                okno.addCommand(cmdAgain);
                licznik++;
            }
        try {
            int a = Integer.parseInt(licz.getString());
            tablica(a);
            }
                catch(NumberFormatException e) {
                    e.printStackTrace();

                }
        }
        if(cmd == cmdKoniec) {
            notifyDestroyed();
        }
    }
    public void tablica (int elem) {
        int[] tab = new int[elem];
        String str = new String("[");
        Random r = new Random(System.currentTimeMillis());
        int maxRange = 99;
        int suma = 0;
        int minTab = maxRange;
        int maxTab = tab[0];
            for(int i = 0; i < elem;i++) {
                tab[i] = r.nextInt(maxRange + 1);
                str = str + tab[i];
                    if(i < elem -1) {
                str = str + "; ";
                    }
                    else {
                str = str + "]";
                    }
                    if(tab[i] <= minTab) {
                minTab = tab[i];
                    }
                    if(tab[i] >= maxTab) {
                maxTab = tab[i];
                    }
                    suma += tab[i];
            }
        siTablica.setText(str);
        siSum.setLabel("Suma: ");
        siSum.setText(Integer.toString(suma));
        siAvg.setLabel("Średnia: ");
        siAvg.setText(Float.toString((float)suma / (float)elem));
        siMax.setLabel("Maksimum: ");
        siMax.setText(Integer.toString(maxTab));
        siMin.setLabel("Minimum: ");
        siMin.setText(Integer.toString(minTab));
    }
}