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

this code here is not working if the class word don't override properly Equals and hashcode...

TreeMap test = new TreeMap<>();
test.put(new Word("pqr",12),1);
test.put(new Word("abc",2),1);

Integer prq = test.get(new Word("pqr",1));
System.out.println(prq);
prq = test.get(new Word("pqr",12));