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How to override equals() and hashCode() method in java?
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@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj == null || obj.getClass() != this.getClass()) {
return false;
}
Employee emp = (Employee) obj;
return id == emp.id
&& (firstName == emp.firstName
|| (firstName != null && firstName.equals(emp.getFirstName())))
&& (lastName == emp.lastName || (lastName != null && lastName .equals(emp.getLastName())));
}// equals method ends
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((firstName == null) ? 0 :frstName.hashCode());
result = prime * result + id;
result = prime * result
+ ((lastName == null) ? 0 : lastName.hashCode());
return result;
}// hashCode method ends
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