如何转换Map< Object，Object>映射到< String，String>在java中? [英] How to convert Map<Object, Object> to Map<String, String> in java?

问题描述

我具有对象类型的Map，我需要将此映射转换为String类型.

I have the Map of type Object, i need to convert this map into the type String.

Map<String, String> map = new HashMap<String, String>();    
Properties properties = new Properties();    
properties.load(instream);     

任何机构都可以告诉我如何将属性分配给上方地图吗?

Can any body please tell me, how to assign the properties to above map?

感谢&问候， 姆斯奈杜

Thanks & Regards, Msnaidu

推荐答案

将属性添加到地图的最简单方法是(根据您的示例):

The cleanest way to add the properties to the map would be (following on from your example):

for (String propName : properties.stringPropertyNames()) {
    map.put(propName, properties.getProperty(propName));
}

在这种特殊情况下，这很好用，因为Properties对象确实是一个包含String键和值的映射，正如getProperty方法清楚表明的那样.仅出于可怕的向后兼容性原因，才将其声明为Map<Object, Object>.

This works nicely in this particular case, because the Properties object is really a map containing String keys and values, as the getProperty method makes clear. It's only declared as Map<Object, Object> for horrible backwards-compatibility reasons.

通过使用特定于属性的方法，而不是将其仅视为Map<Object, Object>，您可以使用完美的类型安全性(而不是强制转换)填充Map<String, String>.

By using the Properties-specific methods, rather than treating this as just a Map<Object, Object>, you can populate your Map<String, String> with perfect type-safety (rather than having to cast).

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