接口 Item
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public interface Item功能描述: if you use item in DataRangers, you should define item in DataRangers before using it example: the item has properties {id,item_name,title,price} then you should define a class like class BookItem implements Item{ private String item_id;// =>id private String item_name;// =>item_name private String title; private float price; } Note: the id in DataRangers is the same as item_id in sdk