backwards-compatibility

问题 I am working in an application where we need to save objects in XML format, and load them later once required. For this I have used JAXB to marshall and unmarshall XMLs back to Java classes. My problem is that the I have to change Java models sometime (by adding, renaming or deleting attributes), as a result, I will have incompatible saved XMLs which can’t be bound back to the new class form. To solve this, every time I have to do a change I take a copy of all the classes under a new package

问题 I have a simple question. MKReverseCoder is deprecated and doesn't work since iOS 5 . We have to use CLGeocoder . But, there are a lot of people under iOS4 . How the new apps can work with iOS4 and iOS5 for geocoding ? Thanks! 回答1: MKReverseGeocoder still works with iOS5. It's just deprecated, which means it'll be removed at some later point (like at the release of something like iOS6). So you can continue to use it now without any issues 回答2: If anyone is trying to move onto CLGeocoder from

问题 For example: // This will become either SomeMethodA or SomeMethodW, // depending on whether _UNICODE is defined. SomeMethod( _T( "My String Literal" ) ); // Becomes either AnotherMethodA or AnotherMethodW. AnotherMethod( _TEXT( "My Text" ) ); I've seen both. _T seems to be for brevity and _TEXT for clarity. Is this merely a subjective programmer preference or is it more technical than that? For instance, if I use one over the other, will my code not compile against a particular system or some

问题 My understanding is that in order to maintain source-compatibility, Java never introduces new methods to public interfaces, as that breaks existing clients implementing the interfaces. Java Release notes states In general, the policy is as follows, except for any incompatibilities listed further below: Maintenance releases (such as 1.4.1, 1.4.2) do not introduce any new language features or APIs. They will maintain source-compatibility with each other. Functionality releases and major

问题 I'm developing an Android application targeting 2.x and 3.0 devices and thus I'm using the compatibilty API. I'm testing on Android 2.0. I'm trying to replace a displayed fragment with another one (search form with search results) and I'm experiencing a crash on orientation change when the second (results) fragment is displayed. Basically, I have an activity, that includes a fragment defined in layout xml as <fragment class="org.prevoz.android.search.SearchFormFragment" android:id = "@+id

问题 I'd like to ensure some backward compatibility for my apps by compiling them using the older SDKs to test for newer classes and methods. However, Xcode is only available with SDKs for the latest iOS versions. I've downloaded and installed the iOS 3.1.3 SDK (using the method described here) and that works fine. My code is full (not so full :-) ) of __IPHONE_OS_VERSION_MAX_ALLOWED, __IPHONE_OS_VERSION_MIN_REQUIRED and such respondsToSelector. This works right now for the iOS 3.1.3 SDK, but what

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Enabling auto layout in iOS 6 while remaining backwards compatible with iOS 5 I'm going to update my app to the new 4 inches display and I figured out that I should check the Use Autolayout checkbox in the inspector. Doing this I loose the compatibility with iOs 5. How can i support the 4" display without loosing this back compatibility? Thank you so much. 回答1: You can use springs and struts to support both form

问题 I need to run a program that uses ftd2xx on my BeagleBoard xM rev C running Ubuntu 12.04. I am trying to use the ARM library libftd2xx.so provided here. libFTDI is not an option. The difference that I noticed comes from running readelf -hA on libftd2xx.so vs other libraries on the BeagleBoard that work. The arch-specific section gives OS name as "ARM926EF-S" for ftd2xx instead of "7-A" for other libraries and CPU_arch as "v5TEJ" instead of "v7". I'm assuming this means that the library is

问题 In order to reduce the clutter caused by numerous instantiations of anonymous types, I'm exploring the possibility of leveraging Java 8 lambdas. One important consideration before using Java 8 and lambdas in a production environment is whether JDK8-compiled code that uses lambda expressions can be executed on an earlier version of the Java runtime. I'm specifically interested in JRE6 and JRE7 as target platforms. One one hand, I understand that lambdas are simply syntactic sugar around an

问题 The question is if can I use safely Visual Studio 2012 to edit projects properties, add and remove solutions, references, all related to NET 4.0 Framework. I remember in the past some files might be "corrupted", while Visual Studio 2010 changed some Visual Studio 2008 csproj information (xml file). If some tags are added/removed in VS2012, then the csproj would be incompatible to VS2010 developers. Does anyone have some information if it is safe to use this new IDE without damaging files? Are