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Start with the upper-left button, attach the top and left edges to the window, offsetting by five pixels

import org.eclipse.swt.SWT; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class FormLayoutFormAttachmentSetButton {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     FormLayout layout = new FormLayout();     layout.marginHeight = 5;     layout.marginWidth = 10;     shell.setLayout(layout);     Button one = new Button(shell, SWT.PUSH);     one.setText("One");     FormData data = new FormData();     data.top = new FormAttachment(0, 5);     data.left = new FormAttachment(0, 5);     data.bottom = new FormAttachment(50, -5);     data.right = new FormAttachment(50, -5);     one.setLayoutData(data);              shell.pack();     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }