get string value from HashMap depending on key name

Question

I have a HashMap with various keys and values, how can I get one value out?

I have a key in the map called my_code, it should contain a str

Answer 1

You can use the get(Object key) method from the HashMap. Be aware that i many cases your Key Class should override the equals method, to be a useful class for a Map key.

Answer 2

map.get(myCode)

Answer 3

This is another example of how to use keySet(), get(), values() and entrySet() functions to obtain Keys and Values in a Map:

        Map<Integer, String> testKeyset = new HashMap<Integer, String>();

        testKeyset.put(1, "first");
        testKeyset.put(2, "second");
        testKeyset.put(3, "third");
        testKeyset.put(4, "fourth");

        // Print a single value relevant to a specified Key. (uses keySet())
        for(int mapKey: testKeyset.keySet())
            System.out.println(testKeyset.get(mapKey));

        // Print all values regardless of the key.
        for(String mapVal: testKeyset.values())
            System.out.println(mapVal.trim());

        // Displays the Map in Key-Value pairs (e.g: [1=first, 2=second, 3=third, 4=fourth])
        System.out.println(testKeyset.entrySet());

Answer 4

 HashMap<Integer, String> hmap = new HashMap<Integer, String>();
 hmap.put(4, "DD");

The Value mapped to Key 4 is DD