将ArrayList转换为HashMap [英] Converting ArrayList to HashMap

问题描述

可能重复：

Java：如何将列表转换为地图

我有arrayList

I have arrayList

ArrayList<Product> productList  = new ArrayList<Product>();
 productList  = getProducts();  //Fetch the result from db

我想将ArrayList转换为HashMap像这样

I want to convert to ArrayList to HashMap Like this

  HashMap<String, Product> s= new HashMap<String,Product>();

请帮我看看如何转换为HashMap。

Please help me how to convert to HashMap.

推荐答案

一般方法是迭代 ArrayList ，并将值插入 HashMap 。示例如下：

The general methodology would be to iterate through the ArrayList, and insert the values into the HashMap. An example is as follows:

HashMap<String, Product> productMap = new HashMap<String, Product>();
for (Product product : productList) {
   productMap.put(product.getProductCode(), product);
}

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