public?class?TestDIServiceImpl?implements?TestDIService?{	private?TestDao?testDao;	//constructor方法注入	public?TestDIServiceImpl(TestDao?testDao){		super();		this.testDao?=?testDao;	}	@Override	public?void?sayHello(String?arg)?{		System.out.println("service構造方法注入sayHello");		arg?=?arg?+?":"?+?this.hashCode();		testDao.sayHello(arg);	}}

結果只顯示arg的內容了，不顯示System.out.println("service構造方法注入sayHello");中的內容