Public? Static electricity Invalid? main(String[]？ args)？ {

BigInteger？ Bi? =? New? BigInteger( 100, new? random())；

System.out.println(bi？ +? "? Is it? Even? :?" ? +? isEven(bi))；

}

Public? Static electricity Bull? isEven(BigInteger？ bi)？ {

BigInteger？ bi_2？ =? big integer . value of(2)；

BigInteger？ bi_0？ =? Big integer. Zero;

Return? Bi. Remainder (bi_2). equals(bi _ 0)；

}

} Two errors:

Remainder requires a parameter of type BigInteger, and int is not a subclass of BigInteger.

Comparisons between objects need to use equals instead of = =.