一個很奇怪的問題

f(equipmentList.size()!=0){



String [] equipIdArray =new String[3];



for (int i = 0; i < equipmentList.size(); i++) {



Element equipment = (Element)equipmentList.get(i);



String equipCode = equipment.elementText("type_code");

System.out.println("equipCode :"+equipCode);



/*

* 用於儲存設備信息的數組

* equipInfoArray [0]存的是type_id T002

* equipInfoArray [1]存的是building_id

* equipInfoArray [2]存的是equip_id

*/

equipIdArray[0] = equipment.elementText("type_id");

equipIdArray[1] = equipment.elementText("building_id");

equipIdArray[2] = equipment.attributeValue("equip_id");

System.out.println("equip_id :"+equipIdArray[2]);



equipInfoHashMap.put(equipCode,equipIdArray);



equipIdArray[0] = null;

equipIdArray[1] = null;

equipIdArray[2] = null;



}

}

System.out.println("equip_id :"+equipIdArray[2]);這句輸出的數據都沒有問題，很正常，可是爲什麼放進hashmap裏面的全都是null的？？？