问题标题:
Mapmap=newHashMap();map.put("first","football");map.put("first","basketball");会输出什么
问题描述:

Mapmap=newHashMap();map.put("first","football");map.put("first","basketball");会输出什么

刘保政回答:
  basketball   后面的会把前面的football覆盖.
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