Get Integer value from key Object of hashmap

Question

In one of my classes say Test, in static block of it; i am constructing map using an object of type BakidRangeid as key and Integer as value. My hashmap declaration looks as below.

public static HashMap<BakidRangeid, Integer> mapBankIdRangeIdToConfId = new HashMap<BakidRangeid, Integer> ();

And BakidRangeid class looks like

public class BakidRangeid {

private int bankId;
private int rangeId;

public int getBankId() {
    return bankId;
}
public void setBankId(int bankId) {
    this.bankId = bankId;
}
public int getRangeId() {
    return rangeId;
}
public void setRangeId(int rangeId) {
    this.rangeId = rangeId;
}

}

When i am trying to get the value from hashmap mapBankIdRangeIdToConfId by setting instance of an BakidRangeid, i get NullpointerException inspite of the object with values of bankid and rangeid, which i am passing is present in the hashmap. I guess i will have to override equals and hashcode methods of my BakidRangeid class. Anyone kindly confirm. Thanks in advance!

Yes, I can confirm that you need to implement `equals` and `hashCode`. — Thilo, Mar 21 '16 at 12:37

score 1 · Answer 1 · edited May 23 '17 at 11:50

1

Please Use hashCode() and equals() method in BakidRangeid class.

Refer this link

edited May 23 '17 at 11:50

Community

1
1

answered Mar 21 '16 at 12:31

Kannan Thangadurai

1,117
2
17
36

score 1 · Accepted Answer · answered Mar 21 '16 at 12:32

1

override equals method of class BakidRangeid before using as a key in hashmap.

answered Mar 21 '16 at 12:32

navintb

129
5

Get Integer value from key Object of hashmap

2 Answers2