TreeMap.get() return Null even key exists

Question

I am trying to get from TreeMap but it return null even the key exist. HashCode and eqauls is based on word only. Comparable is based on freqency.

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Answer 1

Since your Word class implements Comparable interface . So TreeMap uses compareTo method for comparing properties of objects.

If you want to get the object with same String "word" then implement compareTo method like

@Override
public int compareTo(Word o) {
    return this.word.compareTo(o.word);
}