Java for Leetcode 043 Multiply Strings

Given numbers represented as strings, return multiplication of the numbers as a string.

Note:the numbers can be arbitrarily large and is non-negative.

Problem solving idea One:

biginteger!!! The Java implementation is as follows:

static public string Multiply (string num1, String num2) {    Java.math.BigInteger bi1=java.math.biginteger.valueof (0) ;    for (int i=0;i<num1.length (); i++) {    bi1=bi1.multiply (java.math.BigInteger.valueOf);    Bi1=bi1.add (Java.math.BigInteger.valueOf (Num1.charat (i)-' 0 '));    Java.math.BigInteger bi2=java.math.biginteger.valueof (0);    for (int i=0;i<num2.length (); i++) {    bi2=bi2.multiply (java.math.BigInteger.valueOf);    Bi2=bi2.add (Java.math.BigInteger.valueOf (Num2.charat (i)-' 0 '));        Return bi1.multiply (BI2). toString ();    }

Ms Accepted, it is important to note that the system does not automatically import the math package, need to be added when declaring, but the use of BigInteger always have a cheat bright

Java for Leetcode 043 Multiply Strings