我最近一直在学习 HashMaps,但我有一个问题似乎无法得到明确的答案.主要区别 -
I've been learning about HashMaps recently but I have one question that I can't seem to get a clear answer on. The main difference between -
HashMap hash1 = new HashMap();
对比
HashMap<,>hash1 = new HashMap <,> (); //Filled in with whatever Key and Value you want.
我认为当您定义 HashMap 时,它需要键和值.任何帮助将非常感激.谢谢.
I thought when you define a HashMap it requires the Key and Value. Any help would be much appreciated. Thank You.
这些是你的选择:
J2SE <5.0 风格:
J2SE <5.0 style:
Map map = new HashMap();
J2SE 5.0+ 风格(使用泛型):
J2SE 5.0+ style (use of generics):
Map<KeyType, ValueType> map = new HashMap<KeyType, ValueType>();
Google Guava 样式(更短更灵活):
Google Guava style (shorter and more flexible):
Map<KeyType, ValueType> map = Maps.newHashMap();
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