Cannot get attribute of an object

Question

I am writing a BigInteger Class to work with Big Numbers. My BigInteger class has a String variable number to save the absolute value of the number and an integer variable sign to save the sign of this number.

Here is my function to compare 2 numbers:

public boolean equals(Object other) { if (other instanceof BigInteger) return toString().equals(other.toString()) && sign == other.sign; return false; }

However, when I compile, I get this error:

java: cannot find symbol symbol: variable sign location: variable other of type java.lang.Object

Can anyone fix this error? Thank you

Your buildpath is wrong, How do you compile this ? Through eclipse ? — Sercan Ozdemir
– Sercan Ozdemir, Commented Sep 28, 2015 at 10:28

Davide Lorenzo MARINO · Accepted Answer · 2015-09-28 10:31:35Z

4

You need to cast other to BigInteger.

If you don't cast other it is considered of type Object that hasn't a property sign (exactly the error you had).

Here is the code:

public boolean equals(Object other) { if (other instanceof BigInteger) { return toString().equals(other.toString()) && sign == ((BigInteger) other).sign; } return false; }

edited Sep 28, 2015 at 10:31

answered Sep 28, 2015 at 10:28

Davide Lorenzo MARINO

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3 Comments

pexea12 Over a year ago

Thank you, it is really my problem

Davide Lorenzo MARINO Over a year ago

If you find this answer useful you can flag it as the right answer with the green check.

pexea12 Over a year ago

Yeah, I have to wait 10 minutes until I can do that :)

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