小吴读源码记录之Vector

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public Vector(int initialCapacity, int capacityIncrement) {
  super();
  if (initialCapacity < 0)
    throw new IllegalArgumentException("Illegal Capacity: " + initialCapacity);
  this.elementData = new Object[initialCapacity];
  this.capacityIncrement = capacityIncrement;
}

个人理解：由此可见，Vector底层为数组，所以具有查询快，读写慢的特点。