映射到 Java 中的字符串
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Map to String in Java
提问by Dan
When I do System.out.println(map)in Java, I get a nice output in stdout. How can I obtain this same string representation of a Mapin a variable without meddling with standard output? Something like String mapAsString = Collections.toString(map)?
当我System.out.println(map)使用 Java 时，我在 stdout 中得到了不错的输出。如何Map在不干预标准输出的情况下获得变量中 a 的相同字符串表示？像String mapAsString = Collections.toString(map)什么？
采纳答案by BalusC
Use Object#toString().
String string = map.toString();
That's after all also what System.out.println(object)does under the hoods. The format for maps is described in AbstractMap#toString().
所有的亦是在此之后是System.out.println(object)做头套下。地图的格式在 中描述AbstractMap#toString()。
Returns a string representation of this map. The string representation consists of a list of key-value mappings in the order returned by the map's
entrySetview's iterator, enclosed in braces ("{}"). Adjacent mappings are separated by the characters ", " (comma and space). Each key-value mapping is rendered as the key followed by an equals sign ("=") followed by the associated value. Keys and values are converted to strings as byString.valueOf(Object).
返回此地图的字符串表示形式。字符串表示由一系列键值映射组成，按映射
entrySet视图的迭代器返回的顺序排列，括在大括号（“{}”）中。相邻的映射由字符“,”（逗号和空格）分隔。每个键值映射都呈现为键后跟等号 ("=") 后跟关联的值。键和值被转换为字符串 byString.valueOf(Object)。
回答by Aravind Yarram
You can also use google-collections (guava) Joiner class if you want to customize the print format
如果要自定义打印格式，也可以使用 google-collections (guava) Joiner 类
