java 泛型方法

public static <T> T getControl(ScriptHelper app, String widgetID, Class<T> cls)throws Throwable{
		String controlName = ParseFile.getParseInfo(widgetID).get("Name");
		// 获取TestClass的Class对象
		Class tClass = Class.forName(cls.getName());
		T control = null;
		Constructor con = null;
		con = tClass.getConstructor(WindowExt.class, IFindRule.class, String.class );
		control =  (T) con.newInstance(new Object[] {
				BodyFrameFacotry.getBodyFrame(app, widgetID), 
				FindRuleFactory.byProperties(ParseFile.getWidgetPro()), 
				controlName });
		return control;
	}