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如何正确使用哈希地图？

data-structures hashmap key-value java map
2022-09-04 08:09:11
HashMap savedStuff = new HashMap();
savedStuff.put("symbol", this.symbol); //this is a string
savedStuff.put("index", this.index); //this is an int

给我警告：

HashMap is a raw type. References to generic type HashMap<K,V> should be parameterized

答案 1
HashMap<String, Object> savedStuff = new HashMap<String, Object>();

当然，在提取元素时，您仍然必须小心使用正确的类型。


答案 2

您需要使用泛型，如下所示：

Map<String, Object> savedStuff = new HashMap<String, Object>();

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php pass-by-reference optional-parameters default-value javascript arrays dom function string object serialization tostring visibility syntax jslint use-strict operators equality equality-operator identity-operator datetime timestamp date-arithmetic redirect angularjs loops foreach iteration scope variables
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