java override equals and hashcode
// EXAMPLE CLASS
public class User {
private String name;
private int age;
private String passport;
@Override public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof User)) {
return false;
}
User user = (User) o;
return user.name.equals(name) &&
user.age == age &&
user.passport.equals(passport);
}
@Override public int hashCode() {
int result = 17;
result = 31 * result + name.hashCode();
result = 31 * result + age;
result = 31 * result + passport.hashCode();
return result;
}