transient

I am new at core data and am trying to figure out how to create a custom sectionNameKeyPath in my NSFetchedResultsController . I have a managed object with an attribute called acctPeriod . It is a NSString . I want to create sections based on the first 4 characters of this field. The first 4 characters represent the year of the accounting period and doesn't need to be saved. I have gone through this site and have seen posts about transient attributes but I can't seem to get them to work. Basically I want this and then assign periodYear for my sectionNameKeyPath . @dynamic periodYear; -

If I try to do 1000 000 assoc! on a transient vector, I'll get a vector of 1000 000 elements (count (let [m (transient [])] (dotimes [i 1000000] (assoc! m i i)) (persistent! m))) ; => 1000000 on the other hand, if I do the same with a map, it will only have 8 items in it (count (let [m (transient {})] (dotimes [i 1000000] (assoc! m i i)) (persistent! m))) ; => 8 Is there a reason why this is happening? The transient datatypes' operations don't guarantee that they will return the same reference as the one passed in. Sometimes the implementation might decide to return a new (but still transient)

public class Foo implements java.io.Serializable { private int v1; private static double v2; private Loan v3 = new Loan(); } Options: A. An instance of Foo can be serialized because Foo implements Serializable. B. An instance of Foo cannot be serialized because Foo contains a non-serializable instance variable v3. C. If you mark v3 as transient, an instance of Foo is serializable. D. b and c Answer: D Explanation: An object may not be serialized even though its class implements java.io.Serializable , because it may contain non-serializable instance variables. Now my question is: As far as I

This question already has an answer here: Why does Java have transient fields? 13 answers I have an issue related to the transient keyword's use before the private modifier in java . variable declaration: transient private ResourceBundle pageResourceBundle; My class looks like this : public class LoginViewModel extends AbstractViewModel { transient private ResourceBundle pageResourceBundle; @AfterCompose public void afterCompose(@ContextParam(ContextType.VIEW) Component view) { initializeLoginValues(); boolean timeout = BooleanUtils.toBoolean(getHttpServletRequest().getParameter("timeout"));

This question already has an answer here: Why does Java have transient fields? 13 answers I saw somewhere transient private TrackDAO trackDAO; Google is your friend - first hit - also you might first have a look at what serialization is. It marks a member variable not to be serialized when it is persisted to streams of bytes. When an object is transferred through the network, the object needs to be 'serialized'. Serialization converts the object state to serial bytes. Those bytes are sent over the network and the object is recreated from those bytes. Member variables marked by the java

I just want to know what is the difference between all these annotations. Why are we using these... means they have no effect especially field level and property level. And what is the purpose of using mixed level annotation like: @Entity @Access(AccessType.FIELD) class Employee { // why their is a field level access private int id; // whats the purpose of transient here @Transient private String phnnumber; // why its a property level access @Access(AccessType.property) public String getPhnnumber() { return "1234556"; } } what exactly this class says? By default the access type is defined by