Re: JTable setValueAt problem

Your code is the worst Java code I've ever seen past more than ten
years. It is worst because you have never learnt the basics of Java
GUI programming from authoritative sources. I heartily recommend
you not to write any application code until you done the basics
learning. There are good Swing books and online tutorials.

Well, anyway, try and study this code:
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import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class GinjasVinjaTable{
  private JFrame frame;
  private Container con;
  private JButton viewButton;
  private DefaultTableModel model;
  private ViewButtonHandler vbh;
  private JScrollPane jsc;
  private JTable table;
  private Vector<String> colNames;
  private Vector<Vector<String>> tableData;
  private int colCount;

  public GinjasVinjaTable(){
    frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    con = frame.getContentPane();
    con.setLayout(null); // real Java programmer should
                                      // never use null layout!!!
    colCount = 0;

    colNames = new Vector<String>();
    colNames.add("Cassette"); ++colCount;
    colNames.add("Loaded"); ++colCount;
    colNames.add("Dispensed"); ++colCount;
    colNames.add("Rejected"); ++colCount;
    colNames.add("Remaining"); ++colCount;

    tableData = new Vector<Vector<String>>();
    for (int i = 0; i < colCount; ++i){
      tableData.add(new Vector<String>());
    }

    vbh = new ViewButtonHandler();

    prepareGUI();

    frame.setSize(550, 400);
    frame.setVisible(true);
  }

  void prepareGUI(){
    model = new DefaultTableModel(tableData, colNames);
    table = new JTable(model);
    jsc = new JScrollPane(table);
    jsc.setBounds(27, 88, 468, 199);
    con.add(jsc);

    viewButton = new JButton("View");
    viewButton.setBounds(218, 325, 85, 25);
    con.add(viewButton);

    viewButton.addActionListener(vbh);
  }

  class ViewButtonHandler implements ActionListener{
    public void actionPerformed(ActionEvent e){
      viewButton.setEnabled(false);

      table.setValueAt("nosilac virusa gripa", 0, 4);
      table.setValueAt("glupak", 0, 3);
      table.setValueAt("budala", 0, 2);
      table.setValueAt("svinja", 0, 1);
      table.setValueAt("draginja", 0, 0);

      System.out.println("setValue Tabela: ");
      System.out.println("(0,0): " + table.getValueAt(0, 0));
      System.out.println("(0,1): " + table.getValueAt(0, 1));
      System.out.println("(0,2): " + table.getValueAt(0, 2));
      System.out.println("(0,3): " + table.getValueAt(0, 3));
      System.out.println("(0,4): " + table.getValueAt(0, 4));
    }
  }

  public static void main(String[] args){
    new GinjasVinjaTable();
  }
}
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