need help to sort a list

**gretaks** · 11-01-2011, 07:23 PM

need help to sort a list. i used defaulttablemodel, and i need to create a button to sort all computers but i don't know how to do that.
i tried to insert this:

Java Code:

       if(mygtukasX==bRikiavimas)
       {
           atranka = ka.visiPC.sort(Kompiuteris.pagalKaina);// Kompiuteris.pagalKaina
           ClearTable();
           printOutTable(atranka);
           return;
       }

but it's not working.
in this code i have to insert that sort. :

Java Code:

package Lab2Kazlauskaitė;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import studijosKTU.*;
import java.io.*;
import javax.swing.table.DefaultTableModel;
//-------------------------------------------------
public class Meniu extends JFrame implements ActionListener {
    
    static PCApskaita ka = new PCApskaita();
    ListKTUx<Kompiuteris> atranka = new ListKTUx<Kompiuteris>(new Kompiuteris());
    //ListKTU<Kompiuteris> rikiuoti = new ListKTU<Kompiuteris>();
    public Meniu()
    {
        Langas();
    }
    JButton bSkaitytiFaila = new JButton("Skaityti faila");
    JButton bPapildytiSar = new JButton ("Papildyti sarasa");
    JButton bAtrinktiPagalGamintoja = new JButton("Atr. pagal gamintoja");
    JButton bAtrinktiPagalKaina = new JButton("Atr. pagal kaina");
    JButton bAtrinktiPagalTalpa = new JButton("Atr. pagal talpa");
    JButton bBrangiausias = new JButton("Brangiausias");
    JButton bRikiavimas = new JButton("Rikiavimas");
    private DefaultTableModel model = new DefaultTableModel();
    private JTable lentele = new JTable(model);
    //private JTable lentele;
    private JScrollPane juosta;
//-------------------------------------------------
    public void Langas() {
        bSkaitytiFaila.addActionListener(this);
        bPapildytiSar.addActionListener(this);
        bAtrinktiPagalGamintoja.addActionListener(this);
        bAtrinktiPagalKaina.addActionListener(this);
        bAtrinktiPagalTalpa.addActionListener(this);
        bBrangiausias.addActionListener(this);
        bRikiavimas.addActionListener(this);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(900, 400);
        išdėstymas();
        setVisible(true);        
    }
//-------------------------------------------------
    public void išdėstymas() {
        setLocation(400, 300);
        Container vidus = getContentPane();
        vidus.setBackground(Color.LIGHT_GRAY);
        vidus.setLayout(new BorderLayout());
        //mygtuku juosta
        Panel v = new Panel();
        v.setLayout(new FlowLayout());
        vidus.add(v, BorderLayout.NORTH);

        v.add(bSkaitytiFaila);
        v.add(bPapildytiSar);
        v.add(bAtrinktiPagalGamintoja);
        v.add(bAtrinktiPagalKaina);
        v.add(bAtrinktiPagalTalpa);
        v.add(bBrangiausias);
        v.add(bRikiavimas);
        //lenteles panele
        Panel p = new Panel();
        p.setLayout(new BorderLayout());
        vidus.add(p, BorderLayout.CENTER);
                
	juosta = new JScrollPane( lentele );
	p.add( juosta );
        model.addColumn("Gamintojas");
        model.addColumn("Talpa");
        model.addColumn("V.Plokste");
        model.addColumn("RAM");
        model.addColumn("Kaina");
}
//-------------------------------------------------
    private void ClearTable()
    {
    while (model.getRowCount()>0)
            {
                model.removeRow(0);
            }
    }
//-------------------------------------------------
    public void printOutTable(ListKTUx<Kompiuteris> sar)
    {       
        Object duomenys[] = new Object [5];        
        for(Kompiuteris a : sar)
        {
            duomenys[0] = a.getGamintojas();
            duomenys[1] = a.getTalpa();
            duomenys[2] = a.getvPlokste();
            duomenys[3] = a.getaRAM();
            duomenys[4] = a.getKaina();
            
            model.addRow(duomenys);
        }        
    }
//------------------------------------------------- 
    public void actionPerformed(ActionEvent event) {
       Object mygtukasX = event.getSource();
       if(mygtukasX==bSkaitytiFaila)
       {
            File f1 = new File(".", "ban.txt");
            JFileChooser fc = new JFileChooser(".");
            int rez = fc.showOpenDialog(null);
            if (rez == JFileChooser.APPROVE_OPTION)
            {		  
		  f1 = fc.getSelectedFile();
                  Ks.setDataFolder(fc.getCurrentDirectory().toString());		  
            } 
            else if (rez == JFileChooser.CANCEL_OPTION)
            {
		  
            }          
            ka.visiPC.load(f1.getName());
            ClearTable();
            printOutTable(ka.visiPC);
            return;
       }
       if(mygtukasX==bPapildytiSar)
       {
           String pc = JOptionPane.showInputDialog("Iveskite kompiuterio duomenis");
               Kompiuteris a=new Kompiuteris(pc);
               String klaidosPožymis=a.validate();
               if (klaidosPožymis.length()==0)
               {
                   ka.visiPC.add(a);
                   ka.visiPC.save("rez.txt");
                   ClearTable();
                   printOutTable(ka.visiPC);
               }
               else
                 JOptionPane.showMessageDialog (this,"Irasas nepriimtas");
          return;
       }
       if(mygtukasX==bAtrinktiPagalGamintoja)
       {
           String inputValue = JOptionPane.showInputDialog("Iveskite gamintoja");
           try{
               atranka = ka.atrinktiGamintoja(String.valueOf(inputValue));
           }
           catch (NumberFormatException exc)
           {
               JOptionPane.showMessageDialog (this,"blogai ivestas pavadinimas");
               return;
           }
           ClearTable();
           printOutTable(atranka);
       }
       if(mygtukasX==bAtrinktiPagalKaina)
       {
           try
           {
           String inputValue = JOptionPane.showInputDialog("Iveskite pradine kaina");
           atranka = ka.atrinktiPagalKaina(Double.parseDouble(inputValue));
           }
           catch (NumberFormatException exc)
           {
               JOptionPane.showMessageDialog (this,"Blogai ivestas skaicius");
               return;
           }
            ClearTable();
            printOutTable(atranka);
            return;
       }
       if(mygtukasX==bAtrinktiPagalTalpa)
       {
           try
           {
               String inputValue = JOptionPane.showInputDialog("Iveskite talpa");
               atranka = ka.atrinktiPagalTalpa(Double.parseDouble(inputValue));
           }
           catch (NumberFormatException exc)
           {
               JOptionPane.showMessageDialog(this,"Blogai ivestas skaicius");
               return;
           }
       }
       if(mygtukasX==bBrangiausias)
       {
            atranka = ka.maksimaliosKainosPC();
            ClearTable();
            printOutTable(atranka);
            return;       
       }

    }
    
}

**JosAH** · 11-01-2011, 07:31 PM

Did you read the API documentation for the Collections class? It has a method that can sort a List.

kind regards,

Jos

**gretaks** · 11-01-2011, 07:46 PM

well, kind of.. can u write a code how to do that?

**JosAH** · 11-01-2011, 07:48 PM

Originally Posted by gretaks

well, kind of.. can u write a code how to do that?

Yes, I can, but you go first because it's your assignment. Feel free to come back here again if you're stuck; tip: also read the API documentation for the Comparable<T> interface.

kind regards,

Jos

**gretaks** · 11-01-2011, 07:57 PM

haha i tried.. but's it's not working for me.

**JosAH** · 11-01-2011, 08:00 PM

Originally Posted by gretaks

haha i tried.. but's it's not working for me.

A real programmer tries again; s/he doesn't let the incorrect program win.

kind regards,

Jos

**gretaks** · 11-01-2011, 08:28 PM

i'm not a programmer, in life i won't need it this thing..i'm looking forward to create films and so on.. ;D and i tried about 5 times..

**gretaks** · 11-01-2011, 08:55 PM

ok, i need to sort a list of computers..
i made buttons to find a biggest price computer, biggest HDD and so on. using methods

when i tried to use method sort() it''s not working. some error using like this

if(mygtukasX==bRikiavimas) // mygtukasX=buttonX and bRikiavimas=bSort (names)
{
atranka = ka.visiPC.sort(Kompiuteris.pagalKaina);// visiPC it's where my computer list are kind of.. i use .sort(Kompiuteris.pagalKaina) so it''s using Kompiuteris=Computer(info).pagalKaina(by price) to sort it
ClearTable();
printOutTable(atranka);
return;
}

should i write something different?

**Norm** · 11-01-2011, 11:55 PM

when i tried to use method sort() it''s not working. some error

You need to show the error messages you are getting.

**gretaks** · 11-02-2011, 05:26 AM

at this line:
atranka = ka.visiPC.sort(Kompiuteris.pagalKaina);
it shows this error:
incompatible types
required studijosKTU.ListKtux<Lab2Kazlauskaite.Kompiuteris>
found: void

**Norm** · 11-02-2011, 02:41 PM

You need to show the definitions for Kompiuteris, pagalKaina, VisiPC. ListKtux and studijosKTU.
Without the definitions for ALL of the variables shown in the error message, there is no way to make any suggestions.

**gretaks** · 11-02-2011, 08:19 PM

now i know how to do it.. i cane create a table by myself and create comperators to each column, o it have to work with setRowSorter on one table it's work and on mine it's not .. lecturer haven't find error so he said to do different or leave it how i tried to do and he gave me 0.5 ;) so i have 9.5/10 it's ok :/ :)