Enum maps are represented internally as arrays. K[] keyUniverse array of keys and Object[] vals array of values. These arrays are transient. Can you tell me why?
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1
它们是瞬态的,以允许以不同(更好)的方式进行序列化。也是entrySet
瞬态的。
private void writeObject(java.io.ObjectOutputStream s)
throws java.io.IOException
{
// Write out the key type and any hidden stuff
s.defaultWriteObject();
// Write out size (number of Mappings)
s.writeInt(size);
// Write out keys and values (alternating)
for (Map.Entry<K,V> e : entrySet()) {
s.writeObject(e.getKey());
s.writeObject(e.getValue());
}
}
private void readObject(java.io.ObjectInputStream s)
throws java.io.IOException, ClassNotFoundException
{
// Read in the key type and any hidden stuff
s.defaultReadObject();
keyUniverse = getKeyUniverse(keyType);
vals = new Object[keyUniverse.length];
// Read in size (number of Mappings)
int size = s.readInt();
// Read the keys and values, and put the mappings in the HashMap
for (int i = 0; i < size; i++) {
K key = (K) s.readObject();
V value = (V) s.readObject();
put(key, value);
}
}
于 2015-04-03T10:07:13.350 回答