equals vs hashCode (K&B Exam 6)

[Michal Burak]

K&B Exam SCJP6 quiz 1 question 52:



My code that prints "false true" is below. Hashcodes are not equal, equals returns true. But equal objects must have equal hashcodes.
So conclusion: only "C" is the correct answer ("D" is not correct opposed to what it says in the mock exam). Am I right or do I miss something?

public class Y {
String name;
int bal;
String code;
short rate;
@Override
public int hashCode() {
return code.length() * bal;
}
@Override
public boolean equals(Object o) {
Y y = (Y) o;
return y.code.length() * y.bal * y.rate == this.code.length() * this.bal * this.rate;
}
public static void main(String[] args) {
Y y1 = new Y();
y1.code = "code";
y1.bal = -3;
y1.rate = 1;
Y y2 = new Y();
y2.code = "code";
y2.bal = 3;
y2.rate = -1;
System.out.println(y1.hashCode() == y2.hashCode());
System.out.println(y1.equals(y2));
}
}

[Ankit Garg]

Yes you are right, this is an error in the mock exam. This has been asked before too

And welcome to javaranch...

[Michal Burak]

 

Ankit Garg wrote:Yes you are right, this is an error in the mock exam. This has been asked before too

And welcome to javaranch...

Thanks