转换Map< String，Object>映射到< String，String> [英] Convert Map<String,Object> to Map<String,String>

问题描述

如何将Map<String,Object>转换为Map<String,String>?

这不起作用:

Map<String,Object> map = new HashMap<String,Object>(); //Object is containing String
Map<String,String> newMap =new HashMap<String,String>(map);

推荐答案

如果您的Objects仅包含Strings，那么您可以这样做:

If your Objects are containing of Strings only, then you can do it like this:

Map<String,Object> map = new HashMap<String,Object>(); //Object is containing String
Map<String,String> newMap =new HashMap<String,String>();
for (Map.Entry<String, Object> entry : map.entrySet()) {
       if(entry.getValue() instanceof String){
            newMap.put(entry.getKey(), (String) entry.getValue());
          }
 }

如果每个Objects都不是String，则可以将(String) entry.getValue()替换为entry.getValue().toString().

If every Objects are not String then you can replace (String) entry.getValue() into entry.getValue().toString().

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