怪异的JAVA对象属性存储

public class TestBean {
public int intPro;
public String strPro;
public int intExtend;
public String strExtend;
}

/**

* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
unsafe = getUnsafeInstance();
TestBean test=new TestBean();
test.intPro=1111;
test.strPro="22222333";
test.intExtend=3333;
test.strExtend="extend";
marshal(test);
}
    @SuppressWarnings({ "deprecation", "restriction" })
public static void marshal(TestBean bean) throws NoSuchFieldException, SecurityException
    {
    Field[] fields=bean.getClass().getDeclaredFields();
    for(int i=0;i<fields.length;i++)
    {
    Field field =fields[i];
    System.out.println(field.getName()+":"+unsafe.objectFieldOffset(field));//打印出字段在对象的偏移地址
    }

     }

结果输出是：

intPro:12
strPro:20
intExtend:16
strExtend:24

按理说strPro的偏移位置应该是16，而实际上变成了intExtend 偏移位置是16

原因还在研究中，有结论再补充上来