Java determines whether an object is an array and gets the value of the arrays---using instanceof or IsArray () method

Today's project logic needs to pass the number of groups past. Then a generic method is invoked. But the parameter of this method is object. If you change the parameter type, the other module calls this method and there is a problem.

The final solution is to add a judgment to the DAO layer

This is the DAO layer code

Public List Findbyproperty (String PropertyName, Object value) {
		List list = new ArrayList ();
		String querystring = "from Userinfo as model where model." + propertyname + =? ORDER by Model.userinfoid DESC ";
		
		try {
////			judge if string array type
			if (value instanceof   string[]) {
				///If True to strong to string array
				string [] Arr = (string[]) value;
				for (int i = 0; i < arr.length i++) {
					this.gethibernatetemplate (). Find (QueryString, value);
					List.add (This.gethibernatetemplate (). Find (QueryString, arr[i));
				}
			else{
				list = This.gethibernatetemplate (). Find (QueryString, value);
			}
		catch (RuntimeException re) {
			Log.error ("Find by property name failed", re);
			throw re;
		}
		return list;
	}

In addition to instanceof to judge can also use the Istarray method

if (Value.getclass (). IsArray ()) {
   //If it is an array then action
}

Online search looked down they all suggested using the IsArray method to say that the first one could be an anomaly.