how to get hashmap values depends on key

问题

i have this hashmap with string and arraylis:

Map<String, ArrayList<String>> devNameType = new HashMap<String, ArrayList<String>>();
public void kimenetPV(String name){
        //létrehozom a nevet
                String devName = name;

                //létrehozom a kimeneteket tartalmazó arraylistet
                ArrayList<String> outputs = new ArrayList<String>();

                // 2. hozzáadaom az elemeket
                outputs.add("EM A");
                outputs.add("EM B");
                outputs.add("AOUT1");
                outputs.add("AOUT2");               

                devNameType.put(devName, outputs);

                Iterator iter = devNameType.entrySet().iterator();

                //kilistázom az elemeket
                while (iter.hasNext()) {
                    Map.Entry mEntry = (Map.Entry) iter.next();
                    System.out.println(mEntry.getKey() + " : " + mEntry.getValue());
                }
    }

how can i print all the values? Sorry for the begginer question i'm using the hashmaps for first time.

回答1:

You can print the key:value pairs as this:

Iterator<Entry<String, List<String>>> iter = devNameType.entrySet().iterator();
while (iter.hasNext()) {
    Entry<String, List<String>> next = iter.next();
    List<String> value = next.getValue();
    System.out.println("key = " + next.getKey());
    System.out.println("values : ");
    for (String str : value) {
        System.out.println(str);
    }
}

回答2:

for (List<String> value : devNameType.values()) {
    ... do something with this value
}

For key/value:

for (String key: devNameType.keySet()) {
    List<String> values = devNameType.get(key);
    ... do something with the name and values
}

See http://docs.oracle.com/javase/6/docs/api/java/util/Map.html#values() and http://docs.oracle.com/javase/6/docs/api/java/util/Map.html#keySet()

回答3:

With hashMap.values() you get a Collection of all values: http://developer.android.com/reference/java/util/HashMap.html#values()

来源：https://stackoverflow.com/questions/19495155/how-to-get-hashmap-values-depends-on-key

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java

android

hashmap