load factor in FSTMapSerializer.instantiate() method

[leonchen83]

public Object instantiate(Class objectClass, FSTObjectInput in, FSTClazzInfo serializationInfo, FSTClazzInfo.FSTFieldInfo referencee, int streamPosition) throws Exception {
        Object res = null;
        int len = in.readInt();
        if ( objectClass == HashMap.class ) {
            res = new HashMap(len);
        } else
        if ( objectClass == Hashtable.class ) {
            res = new Hashtable(len);
        } else
        {
            res = objectClass.newInstance();
        }
        in.registerObject(res, streamPosition,serializationInfo, referencee);
        Map col = (Map)res;
        for ( int i = 0; i < len; i++ ) {
            Object key = in.readObjectInternal(null);
            Object val = in.readObjectInternal(null);
            col.put(key,val);
        }
        return res;
    }

might res = new HashMap(2*len) can avoid HashMap resize

[RuedigerMoeller]

afaik hashmap does this internally ? have you observed a resize ?

public HashMap(int initialCapacity, float loadFactor) {
        if (initialCapacity < 0)
            throw new IllegalArgumentException("Illegal initial capacity: " +
                                               initialCapacity);
        if (initialCapacity > MAXIMUM_CAPACITY)
            initialCapacity = MAXIMUM_CAPACITY;
        if (loadFactor <= 0 || Float.isNaN(loadFactor))
            throw new IllegalArgumentException("Illegal load factor: " +
                                               loadFactor);
        this.loadFactor = loadFactor;
        this.threshold = tableSizeFor(initialCapacity);
    }

[leonchen83]

I mean in jdk 1.7

    public HashMap(int initialCapacity, float loadFactor) {
        if (initialCapacity < 0)
            throw new IllegalArgumentException("Illegal initial capacity: " +
                                               initialCapacity);
        if (initialCapacity > MAXIMUM_CAPACITY)
            initialCapacity = MAXIMUM_CAPACITY;
        if (loadFactor <= 0 || Float.isNaN(loadFactor))
            throw new IllegalArgumentException("Illegal load factor: " +
                                               loadFactor);

        this.loadFactor = loadFactor;
        threshold = initialCapacity;
        init();
    }