question: public void testValueOfLongPositive1 ( ) { long longVal = 268209772258930018L ; BigInteger aNumber = BigInteger . valueOf ( longVal ) ; byte rBytes [ ] = { 3 , - 72 , - 33 , 93 , - 24 , - 56 , 45 , 98 } ; byte resBytes [ ] = new byte [ rBytes . length ] ; resBytes = aNumber . toByteArray ( ) ; for ( int i = 0 ; i < resBytes . length ; i ++ ) { assertTrue ( resBytes [ i ] == rBytes [ i ] ) ; } assertEquals ( "incorrect sign" , 1 , aNumber . signum ( ) ) ; }
target:  valueOf (long val): convert a positive long value to a BigInteger.