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http://www.cnblogs.com/fanyabo/p/4067295.html
import java.math.BigInteger;
public class MainClass
{
public static void main(String[] argv) throws Exception
{
BigInteger bigInteger1=new BigInteger("123456789012345689123413241234109999321413253426256");
BigInteger bigInteger2=new BigInteger("999999999999999999999999999999999 ...