Java编译器真正的编译优化了循环吗？ — JAVA频道 - 数据挖掘研究院( China Data Mining Research ,ChinaKDD)

此文章只是用来在java编译器进行循环化方面的验证，本文是有感而发，并希望求得大家的分析结果，这里引用了一位网友的话（没有人身攻击的色彩）:
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对于Vector v=new Vector()若v中包含了10000个对象,我们进行一个loop如下
for(int I=0; I大家一定会用如下的写法吧
int size = v.size(); for(int I=0; I///////////////////////////
但有些网友说(只是为了说明问题而已，无攻击色彩）：
不能用完全解释语言过程来理解Java，v.size()在循环中并没有被调用10000次，因为，编译的循环优化会对其进行优化，
因此，实际运行时只运行一次，和用初始化v.size()的程序效率一样。这是很早的编译优化机制。
大家肯定这种说法正确吗？我不太赞同,很简单地可以用一个test作难证:
一个类Vector的类TetstObj.java

/**
* Returns the number of components in this vector.
*
* @return the number of components in this vector.
*/
protected int elementCount;
/**
* Inserts the specified object as a component in this vector at the
* specified index. Each component in this vector with
* an index greater or equal to the specified index is
* shifted upward to have an index one greater than the value it had
* previously.
*
* The index must be a value greater than or equal to 0
* and less than or equal to the current size of the vector. (If the
* index is equal to the current size of the vector, the new element
* is appended to the Vector.)
*
* This method is identical in functionality to the add(Object, int) method
* (which is part of the List interface). Note that the add method reverses
* the order of the parameters, to more closely match array usage.
*
* @param obj the component to insert.
* @param index where to insert the new component.
* @exception ArrayIndexOutOfBoundsException if the index was invalid.
* @see #size()
* @see #add(int, Object)
* @see List
*/
public synchronized void insertElementAt(Object obj, int index) {
modCount++;
if (index >= elementCount + 1) {
throw new ArrayIndexOutOfBoundsException(index
+ " > " + elementCount);
}
ensureCapacityHelper(elementCount + 1);
System.arraycopy(elementData, index, elementData, index + 1, elementCount - index);
elementData[index] = obj;
elementCount++;
}
/**
* Returns the number of components in this vector.
*
* @return the number of components in this vector.
*/
public synchronized int size() {
return elementCount;
}