import java.awt.BorderLayout;
import java.util.ArrayList;
import java.util.Vector;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class MainFrame extends JFrame{
    DefaultTableModel model = new DefaultTableModel();
    JTable table = new JTable();
    JScrollPane pane = new JScrollPane();
    public MainFrame() {
        ArrayList<Employee> employeeList = new ArrayList<>();        
        employeeList.add(new Employee(1, "Erős István", "Szeged", 395.0));
        employeeList.add(new Employee(2, "Csontos Ferenc", "Szolnok", 392.3));

        Object[] cols = {"#", "Név", "Település", "Fizetés"};        
        this.model.setColumnIdentifiers(cols);
        for (Employee emp : employeeList) {
            Vector<Object> row = new Vector<>();
            row.add(emp.id);
            row.add(emp.name);
            row.add(emp.city);
            row.add(emp.salary);
            model.addRow(row);
        }

        this.table.setModel(model);
        this.pane.setViewportView(table);

        this.table.getColumnModel().getColumn(0).setPreferredWidth(5);
        
        this.setLayout(new BorderLayout());
        this.add(pane, BorderLayout.CENTER);

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(400, 300);
        this.setVisible(true);
    }
}