代码如下:DropDownAndSimple.java 代码如下:package swt_jface.demo3; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.RowLayout; import org.eclipse.swt.widgets.Combo; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class DropDownAndSimple { Display display = new D