7) Suppose there is Student class like class student { int age; string name

7) Suppose there is Student class like

class student {
int age;
string name;
}

We want to store these objects in a HashMap. Do we need to
override any methods in Student class? If any which ones
and why? what if i just override equals or just hashcode?
what will be the results in both the cases?

Question Posted / nitin

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7) Suppose there is Student class like class student { int age; string name; } We want to s..

Answer / manoranjan

Logically no need to override any method but problem with
this design will be that we can not find the objects stored
in the hashmap. So to overcome this problem we need to
override equlas() and hashcode() mathod of Object
class.According to Sun java guide line if equals() method is
teeling that two objects are equal then their hashcode must
be same.But reverse is not true.

Is This Answer Correct ?

10 Yes

0 No

7) Suppose there is Student class like class student { int age; string name; } We want to s..

Answer / lucky singh

It is a good practice to override equals() and hashcode()
methods if you are dealing with collections. Both of the
functions are used while searching for a particular object
in a hashmap. In general, equals() method is used to
determine if two objects are meaningfully equal or not. And
hashcode() method is used to determine if two objects are
meaningfully unequal or not.

Is This Answer Correct ?

2 Yes

0 No

7) Suppose there is Student class like class student { int age; string name; } We want to s..

Answer / krishna

There is no need to override equals() and hashCode() methods. But if we want to eliminate duplicate objects in the HashMap, you should override both the methods. Either one is not enough.

Is This Answer Correct ?

0 Yes

0 No

7) Suppose there is Student class like class student { int age; string name; } We want to s..

Answer / punch

Their is NO need to override any methods of student class,
bcoz in the ket of hashmap we are using String and equal
method and hashcode method of String class is already
overrided . So NO need to override any methods and take help
of String class of the same.

Is This Answer Correct ?

1 Yes

7 No

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