[Effective Java] ch1 - item11. equals를 재정의하려거든 hashCode도 재정의하라

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작성중

BigInteger의 hashCode()

public class BigInteger extends Number implements Comparable<BigInteger> {
  public int hashCode() {
        int hashCode = 0;

        for (int i=0; i < mag.length; i++)
            hashCode = (int)(31*hashCode + (mag[i] & LONG_MASK));

        return hashCode * signum;
    }
}