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FormData

Set the preferred width and height of the control. import org.eclipse.swt.SWT; 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 FormLayoutFormDataWidthHeight {   public static void main(String[] args) {     Display display = new Display();     final Shell shell = new Shell(display);     shell.setLayout(new FormLayout());     FormData formData = new FormData();     formData.width = 100;     formData.height = 200;     Button button1 = new Button(shell, SWT.PUSH);     button1.setText("button1");     button1.setLayoutData(formData);     shell.setSize(450, 400);     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }