java 任何可以快速打印地图的实用程序
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Any utility which can print out map quickly
提问by user496949
I am wondering any utility to print out map quickly for debugging purpose.
我想知道任何用于快速打印地图以进行调试的实用程序。
回答by ColinD
You can just print the toString()of a Mapto get a 1-line version of the map, divided up in to key/value entries. If that isn't readable enough, you could do your own looping to print or use Guavato do this:
你可以只打印toString()的Map拿到地图，在划分为键/值项的1行版本。如果这不够可读，您可以自己循环打印或使用Guava来执行此操作：
System.out.println(Joiner.on('\n').withKeyValueSeparator(" -> ").join(map));
That'll give you output of the form
那会给你表格的输出
key1 -> value1 key2 -> value2 ...
回答by weekens
I guess, the .toString() method of implementing class (HashMap or TreeMap for ex.) will do what you want.
我想，实现类（例如 HashMap 或 TreeMap）的 .toString() 方法会做你想做的。
回答by hs11373
Consider: MapUtils (Commons Collection 4.2 API)
考虑：MapUtils（Commons Collection 4.2 API）
It has two methods: debugPrint & verbosePrint.
它有两种方法：debugPrint 和verbosePrint。
回答by Ramkumar Pillai
org.apache.commons.collections.MapUtils.debugPrint(System.out, "Print this", myMap);
回答by Harry Joy
How about this:
这个怎么样：
Map<String, String> map = new HashMap<String, String>();
for (Iterator<String> iterator = map.keySet().iterator(); iterator.hasNext();) {
String key = (String) iterator.next();
System.out.println(map.get(key));
}
or simply:
或者干脆：
System.out.println(map.toString());
回答by StKiller
public final class Foo {
public static void main(String[] args) {
Map<String, String> map = new HashMap<String, String>();
map.put("key1", "value1");
map.put("key2", "value2");
System.out.println(map);
}
}
Output:
输出：
{key2=value2, key1=value1}
回答by janhink
I think that System.out.printlnworks very well with a map, as this:
我认为这System.out.println对地图非常有效，因为：
Map<String, Integer> map = new HashMap<String, Integer>();
map.put("key1", 1);
map.put("key2", 2);
System.out.println(map);
prints:
印刷：
{key1=1, key2=2}
Or you can define an utility method like this:
或者你可以像这样定义一个实用方法：
public void printMap(Map<?, ?> map)
{
for (Entry<?, ?> e : map.entrySet())
{
System.out.println("Key: " + e.getKey() + ", Value: " + e.getValue());
}
}
回答by KapudanPasha
Try using StringUtils.join(from Commons Lang)
尝试使用StringUtils.join（来自Commons Lang）
e.g.
例如
Map<String, String> map = new HashMap<String, String>();
map.put("abc", "123");
map.put("xyz", "456");
System.out.println(StringUtils.join(map.entrySet().iterator(), "|"));
will produce
会产生
abc=123|xyz=456
