hashMap 方法详解

 /** 
     * 扩展散列表的容量 
     * @param newCapacity 
     */  
    void resize(int newCapacity) {  
        Entry[] oldTable = table;  
        int oldCapacity = oldTable.length;  
        Entry[] newTable = new Entry[newCapacity];  
        transfer(newTable);  
        table = newTable;  
        threshold = (int) (newCapacity * loadFactor);  
    }  
  
    /** 
     * 重新进行散列 
     * @param newTable 
     */  
    void transfer(Entry[] newTable) {  
        Entry[] src = table;  
        int newCapacity = newTable.length;  
        for (int j = 0; j < src.length; j++) {  
            Entry<K, V> e = src[j];  
            if (e != null) {  
                src[j] = null;  
                do {  
                    Entry<K, V> next = e.next;  
                    int i = indexFor(e.hash, newCapacity);  
                    e.next = newTable[i];  
                    newTable[i] = e;  
                    e = next;  
                } while (e != null);  
            }  
        }  
    }