Java Code:
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;

public class Snippet77 {

public static void main(String[] args) {
  Display display = new Display();
  Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
  final Composite comp = new Composite(shell, SWT.NONE);
  final Table table = new Table(comp, SWT.BORDER | SWT.V_SCROLL);
  table.setHeaderVisible(true);
  table.setLinesVisible(true);
  final TableColumn column1 = new TableColumn(table, SWT.NONE);
  column1.setText("Column 1");
  final TableColumn column2 = new TableColumn(table, SWT.NONE);
  column2.setText("Column 2");
  for (int i = 0; i < 10; i++) {
    TableItem item = new TableItem(table, SWT.NONE);
    item.setText(new String[] {"item 0" + i, "item 1"+i});
  }
  comp.addControlListener(new ControlAdapter() {
    public void controlResized(ControlEvent e) {
      Rectangle area = comp.getClientArea();
      Point preferredSize = table.computeSize(SWT.DEFAULT, SWT.DEFAULT);
      int width = area.width - 2*table.getBorderWidth();
      if (preferredSize.y > area.height + table.getHeaderHeight()) {
        // Subtract the scrollbar width from the total column width
        // if a vertical scrollbar will be required
        Point vBarSize = table.getVerticalBar().getSize();
        width -= vBarSize.x;
      }
      Point oldSize = table.getSize();
      if (oldSize.x > area.width) {
        // table is getting smaller so make the columns 
        // smaller first and then resize the table to
        // match the client area width
        column1.setWidth(width/3);
        column2.setWidth(width - column1.getWidth());
        table.setSize(area.width, area.height);
      } else {
        // table is getting bigger so make the table 
        // bigger first and then make the columns wider
        // to match the client area width
        table.setSize(area.width, area.height);
        column1.setWidth(width/3);
        column2.setWidth(width - column1.getWidth());
      }
    }
  });
  shell.open();
  while (!shell.isDisposed()) {
    if (!display.readAndDispatch())
      display.sleep();
  }
  display.dispose();
}
}