迭代嵌套映射 [英] Iterate through nested map
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问题描述
我有一个嵌套的hashmap(hashmap中的Hashmap)。
I have a nested hashmap (Hashmap inside a hashmap).
Map<String,Map<String,String>> test = new HashMap<String,Map<String,String>>();
Map<String,String> testMp = new HashMap<String,String>();
testMp.put("1", "Key1");
testMp.put("2", "Key2");
testMp.put("3", "Key3");
testMp.put("4", "Key4");
testMp.put("5", "Key4");
test.put("One", testMp);
理想情况下,如果我需要打印测试图中的键和值,我会这样做 -
Ideally if I need to print the key and the values in the test map, I'd do this -
for(Map.Entry<String, Map<String,String>> t:test.entrySet()) {
System.out.println("KEY: " +t.getKey()+ " VALUE:" +t.getValue());
}
但我也想要内部地图的关键字和值。我想要这样的东西 -
But I want the key and the value of the inner map as well. I want something like this -
Key of outermap
Key of innermap, and its value.
推荐答案
然后做一个嵌套循环:
for(Map.Entry<String, Map<String,String>> t:test.entrySet()) {
String key = t.getKey();
for (Map.Entry<String,String> e : t.getValue().entrySet())
System.out.println("OuterKey: " + key + " InnerKey: " + e.getKey()+ " VALUE:" +e.getValue());
}
或
for(Map.Entry<String, Map<String,String>> t:test.entrySet()) {
System.out.println(t.getKey());
for (Map.Entry<String,String> e : t.getValue().entrySet())
System.out.println("KEY: " + e.getKey()+ " VALUE:" +e.getValue());
}
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