java– 非可序列化父类的Serializable子类

概述我正在使用android/java中的Location子类序列化打砖块位置不可序列化.我有一个名为FALocation的第一个子类,它没有任何实例变量.我已声明它可序列化.然后我有一个名为Waypoint的第二个类看起来像这样：publicclassWaypointextendsFALocationimplementsSerializable{

我正在使用android / java中的Location子类序列化打砖块

位置不可序列化.
我有一个名为FALocation的第一个子类,它没有任何实例变量.我已声明它可序列化.

然后我有一个名为Waypoint的第二个类看起来像这样：

public class Waypoint extends FALocation implements Serializable {    /**     *      */    private static final long serialVersionUID = 1L;    /* Class variables *******************************************************/    private static int CLASS_VERSION=1; //Used to version parcels    /* Instance variables ****************************************************/    private transIEnt String type=DataHelper.PT_TYPE_US;    private transIEnt String country;     private transIEnt String name=null;    private transIEnt String description=null;    private transIEnt int elevation = 0;    private transIEnt int population = 0; // Afterthought, added to match the DB structure    /* Constructors **********************************************************/        public Waypoint() {        super();    }    public Waypoint(double lat, double lon, String name, String description) {        super(lat, lon);        this.setname(name);        this.setDescription(description);    }    public Waypoint(Location l) {        super(l);    }    public Waypoint(String provIDer) {        super(provIDer);    }    /* Implementing serializable */    private voID writeObject(java.io.ObjectOutputStream out) throws IOException {        Log.v("DroIDFA", "Serialising \"%s\" (v%d).", Waypoint.class.getSimplename(), CLASS_VERSION);        out.writeInt(CLASS_VERSION);        out.writeObject(type);        out.writeObject(country);        out.writeObject(name);        out.writeObject(description);        out.writeInt(elevation);        out.writeInt(population);    }    private voID readobject(java.io.ObjectinputStream in) throws IOException, ClassNotFoundException {        int serialClassversion = in.readInt();        Log.v("DroIDFA", "Deserialising \"%s\" (v%d).", Waypoint.class.getSimplename(),serialClassversion);        type = (String) in.readobject();        country = (String) in.readobject();        name = (String) in.readobject();        description = (String) in.readobject();        elevation = in.readInt();        population = in.readInt();    }}

序列化工作正常.

Deseriamization产生跟随异常(leg对象包含一个航点)：

10-05 13:50:35.259: WARN/System.err(7867): java.io.InvalIDClassException: androID.location.Location; illegalaccessexception10-05 13:50:35.267: WARN/System.err(7867):     at java.io.ObjectinputStream.resolveConstructorClass(ObjectinputStream.java:2010)10-05 13:50:35.267: WARN/System.err(7867):     at java.io.ObjectinputStream.readNewObject(ObjectinputStream.java:2095)10-05 13:50:35.267: WARN/System.err(7867):     at java.io.ObjectinputStream.readNonPrimitiveContent(ObjectinputStream.java:929)10-05 13:50:35.267: WARN/System.err(7867):     at java.io.ObjectinputStream.readobject(ObjectinputStream.java:2285)10-05 13:50:35.278: WARN/System.err(7867):     at java.io.ObjectinputStream.readobject(ObjectinputStream.java:2240)10-05 13:50:35.278: WARN/System.err(7867):     at com.droIDfa.navigation.Leg.readobject(Leg.java:262).../...

解决方法:

是否绝对有必要序列化位置？也许你可以将它标记为瞬态,并在反序列化对象后动态获取它. (Anyway, from the documentation )：

Q: If class A does not implement Serializable but a subclass B implements Serializable, will the fIElds of class A be serialized when B is serialized?

A: Only the fIElds of Serializable objects are written out and restored. The object may be restored only if it has a no-arg constructor that will initialize the fIElds of non-serializable supertypes. If the subclass has access to the state of the superclass it can implement writeObject and readobject to save and restore that state.

因此,如果子类可以访问其非可序列化超类的字段,则可以使用writeObject和readobject协议来实现序列化.否则,将存在无法序列化的字段.

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