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Iterate through a HashMap

Anonymous User 1954 04-May-2015

What's the best way to iterate over the items in a HashMap?

java

Updated on 04-May-2015

Anonymous User

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Anonymous User

04-May-2015

Iterate through the entrySet like so:

public static void printMap(Map mp) {
    Iterator it = mp.entrySet().iterator();
    while (it.hasNext()) {
        Map.Entry pair = (Map.Entry)it.next();
        System.out.println(pair.getKey() + " = " + pair.getValue());
        it.remove(); // avoids a ConcurrentModificationException
    }
}

If you're only interested in the keys, you can iterate through the keySet() of the map:

Map<String, Object> map = ...;
for (String key : map.keySet()) {
    // ...
}

If you only need the values, use values():

for (Object value : map.values()) {
    // ...
}

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Iterate through a HashMap

Anonymous User

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