import javax.swing.*;
import java.awt.*;
public class ScrollableJTable extends JPanel {
    public ScrollableJTable() {
        setLayout(new BorderLayout());
        JTable table = new JTable(10, 10);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_LAST_COLUMN); // vary the constant
        JScrollPane pane = new JScrollPane(table);
        add(pane, BorderLayout.CENTER);
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JPanel panel = new ScrollableJTable();
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                frame.setContentPane(panel);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}