Question

Can anyone please explain me the meaning of implementing Map class and how should i create an iterator? Iv’e googled this in the past hour and i don’t really understand how should implement such interface.

Thanks in advance for any information about it.

Answer 1

Yes it is a bit hard-to-grasp, but please thoroughly study these:

Implementing a simple Map-Entry

public class GenericEntry<KeyType , ValueType> {
    private final KeyType key;
    private ValueType value;

    public MyEntry(KeyType key, ValueType value) {
        this.key = key;
        this.value = value;
    }

    public KeyType getKey() {
        return key;
    }

    public ValueType getValue() {
        return value;
    }

    public void setValue(ValueType value) {
        this.value = value;
    }
}

Source: How to implement Map(and other data struct.) in plain Java

http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Map.html