public static void showArrowButton(Shell shell)
{
//箭头按钮是带有小箭头的按钮，创建时还要指定箭头的方向
//SWT.UP, SWT.DOWN, SWT.LEFT, SWT.RIGHT
//若不指定方向，默认为SWT.UP
Button bt1 = new Button(shell, SWT.ARROW | SWT.UP);
bt1.setToolTipText("SWT.LEFT");
Button bt2 = new Button(shell, SWT.ARROW | SWT.DOWN);
bt2.setToolTipText("SWT.RIGHT");
Button bt3 = new Button(shell, SWT.ARROW | SWT.LEFT);
bt3.setToolTipText("CENTER");
Button bt4 = new Button(shell, SWT.ARROW | SWT.RIGHT);
bt4.setToolTipText("SWT.FLAT");
Button bt5 = new Button(shell, SWT.ARROW | SWT.FLAT);
bt5.setToolTipText("SWT.FLAT");
Button bt6 = new Button(shell, SWT.ARROW | SWT.BORDER);
bt6.setToolTipText("SWT.BORDER");
}