Object-list to actionPerformed

[mordinib]

Here is what i do, i'm reading in objects from a objectfile and the field/list/array is called bilar[] (english = cars[]), and when i want to add a new car you hit the button spara (engish = save) whitch is the "Kspara" button.

To know what place in the array i want to place the new car i have to use the field bilar[] to make sure the object is properly done or even done at all.
I need to use it in the actionPerformed method or in a submethod and then i thought i'd read the object file in the actionPerformed-method but to do that i need a throws Exception in the actionPerformed-method.

So my question is how do i get acces to the field bilar[] or reading the objectfile in the actionPerformed-method.

Note that this is not the whole code so if u need more information/code, just tell me.


Main and GUI

import java.awt.*;
import java.awt.event.*; //innehŒller klasser fšr lyssnare
import javax.swing.*;
import java.io.*;
import java.lang.*;




public class flashback extends JFrame implements ActionListener {

  private JLabel lab = new JLabel("Info om bil. hehehe", JLabel.CENTER);
  private JButton Klaggtillbil = new JButton("Lägg Till Bil", new ImageIcon("flag_swe.gif"));
  private JButton Ksokbil = new JButton("Sök Bil", new ImageIcon("flag_eng.gif"));
  private JButton Ksoksald = new JButton("Sök Såld Bil");
  private JButton Kvisaalla = new JButton("Visa Alla Bilar");
  private JButton Kavsluta = new JButton("Avsluta");
  private JLabel lab2 = new JLabel("Här ska funktionerna vara!", JLabel.CENTER);
  private JLabel bosse = new JLabel("Bosses Bil", JLabel.CENTER);
  private JTextField namn = new JTextField("Namn", 10);
  private JTextField marke = new JTextField("Märke", 10);
  private JTextField modell = new JTextField("Modell",10);
  private JTextField regnummer = new JTextField("Regnummer",10);
  private JTextField pris = new JTextField("Pris",10);
  private JTextField personnr = new JTextField("Personummer",10);
  private JButton Kspara = new JButton("Spara");






  public flashback(){   // Konstruktor

    GridBagLayout m = new GridBagLayout();
    setLayout(m);
    GridBagConstraints con;




    //Lägg till bil-knappen i ruta 1,0
    con = new GridBagConstraints();
    con.gridy = 1; con.gridx = 0; // gridens placering rad 1 altså andra raden och kolumn 0
    con.ipadx=7;				  //utvidga knappen med 7 pixlar från sin orginalstorlek
    con.weightx = 1;
    con.fill = GridBagConstraints.BOTH;
    m.setConstraints(Klaggtillbil, con);
    add(Klaggtillbil);			  //lägger till knappen


    //Funktionsrutan 0,1
    JPanel skapa = new JPanel();        //skapar ny jpanel
    skapa.setBackground(Color.yellow);
    con = new GridBagConstraints();
    con.gridy = 1; con.gridx = 1;
    con.ipadx=100;
    con.weightx = 1;
    con.gridwidth = 1; con.gridheight =7;
    //con.ipadx=200;
    con.fill = GridBagConstraints.BOTH;     //Fyll ut allt utrymme
    m.setConstraints(skapa, con);
    add(skapa); skapa.add(marke); skapa.add(modell); skapa.add(regnummer); skapa.add(pris); skapa.add(personnr); skapa.add(Kspara);

	//Färger, fonter etc
    getContentPane().setBackground(Color.white);
    lab.setFont(new Font("Georgia", Font.ITALIC, 10));
    lab2.setFont(new Font("SansSerif", Font.BOLD, 14));

    //Koppla lyssnare till knapparna
    Klaggtillbil.addActionListener(this);
	marke.setVisible(false);
  	modell.setVisible(false);
  	regnummer.setVisible(false);
  	pris.setVisible(false);
  	personnr.setVisible(false);
  	Kspara.setVisible(false);
  	namn.setVisible(false);

	//pack();
    // Old
    setSize(800,600);

    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

  }

  // Lyssnarmetod
  public void actionPerformed(ActionEvent e) [COLOR="Red"]/* throws Exeption does not work here...*/[/COLOR] {
  	marke.setVisible(false);
  	modell.setVisible(false);
  	regnummer.setVisible(false);
  	pris.setVisible(false);
  	personnr.setVisible(false);
  	Kspara.setVisible(false);
  	namn.setVisible(false);



    if(e.getSource() == Klaggtillbil){
      // AnvŠndaren klickade på knappen lägg till bil
      lab2.setText("lägg till bil");
      namn.setVisible(true);
      marke.setVisible(true);
      modell.setVisible(true);
  	  regnummer.setVisible(true);
  	  pris.setVisible(true);
  	  personnr.setVisible(true);
  	  Kspara.setVisible(true);}

		[COLOR="Red"]//clicked on spara (save)[/COLOR]
  	  if(e.getSource() == Kspara) {
  	  	String nn = namn.getText();
  	  	String me = marke.getText();
  	  	String ml = modell.getText();
  	  	String rr = regnummer.getText();
  	  	String price = pris.getText();
  	  	String pr = personnr.getText();
  	  	String allt = nn + me + ml + rr + price + pr;
		[COLOR="Red"]//here is were i need the object-field/array/list[/COLOR]

  	  	nyBil(nn, me, ml, rr, price, pr);

  	  }
  }





		public static void main (String[] Arg) throws Exception {

			//Lägger in alla nu existerande bilar i minnet genom att läsa en objektfil
			ObjectInputStream objIn = new ObjectInputStream
				(new FileInputStream("utfil.data"));

 				[COLOR="Red"]//This field of objects, i want to use it in the actionPerformed method[/COLOR]
				Bil [] bilar;
				bilar = new Bil[100];
				int raknare=0;
					while (true){
						try{
							bilar[raknare] = (Bil)objIn.readObject();}
						catch (EOFException e){
							break;} //filen är slut}
						raknare++;}

				int k=0;
        		while(bilar[k]!=null){
        		k++;}
			System.out.print(bilar[2].marke);
			//Lägger till menyn (GUI)
    		flashback j = new flashback();
		}


public void nyBil(String nn, String rr, String me, String ml, String price, String pr)
				/* [COLOR="Red"]throws Exception does work here but then i need it in the listener as well.. [/COLOR]*/{
				//reading the object from file
	
				/*ObjectInputStream objIn = new ObjectInputStream
				(new FileInputStream("utfil.data"));
				Bil [] bilar;
				bilar = new Bil[100];
				int raknare=0;
				while (true){
				try{
				bilar[raknare] = (Bil)objIn.readObject();}
				catch (EOFException e){
				break;} //filen är slut}
				raknare++;}*/


				System.out.println(nn + " " + rr);

			}
  }

[Fubarable]

Since the bilar arrays are all local to methods, they are not visible to the class. You may wish to make the array a class field instead.

[mordinib]

Problem solved, thanks Fubarable!

[Fubarable]

Problem solved, thanks Fubarable!

You're welcome! Best of luck with your project!