Java by API/org.eclipse.swt.layout/FillLayout

new FillLayout()

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class MainClass {
  public static void main(String[] a) {
    final Display d = new Display();
    final Shell s = new Shell(d);
    s.setSize(250, 200);
    s.setText("A Table Shell Example");
    s.setLayout(new FillLayout());
    Tree t = new Tree(s, SWT.SINGLE | SWT.BORDER);
    TreeItem child1 = new TreeItem(t, SWT.NONE, 0);
    child1.setText("1");
    TreeItem child2 = new TreeItem(t, SWT.NONE, 1);
    child2.setText("2");
    TreeItem child2a = new TreeItem(child2, SWT.NONE, 0);
    child2a.setText("2A");
    TreeItem child2b = new TreeItem(child2, SWT.NONE, 1);
    child2b.setText("2B");
    TreeItem child3 = new TreeItem(t, SWT.NONE, 2);
    child3.setText("3");
    s.open();
    while (!s.isDisposed()) {
      if (!d.readAndDispatch())
        d.sleep();
    }
    d.dispose();
  }
}

new FillLayout(int i)

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ColorDialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class MainClass {
  public static void main(String[] a) {
    final Display d = new Display();
    final Shell s = new Shell(d);
    s.setSize(300, 300);
    s.setText("A ColorDialog Example");
    s.setLayout(new FillLayout(SWT.VERTICAL));
    final Text t = new Text(s, SWT.BORDER | SWT.MULTI);
    final Button b = new Button(s, SWT.PUSH | SWT.BORDER);
    b.setText("Change Color");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        ColorDialog cd = new ColorDialog(s);
        cd.setText("ColorDialog Demo");
        cd.setRGB(new RGB(255, 255, 255));
        RGB newColor = cd.open();
        if (newColor == null) {
          return;
        }
        t.setBackground(new Color(d, newColor));
      }
    });
    s.open();
    while (!s.isDisposed()) {
      if (!d.readAndDispatch())
        d.sleep();
    }
    d.dispose();
  }
}