My JAVA solution

• ``````public class Solution {
public String multiply(String num1, String num2) {
if (num1.equals("0") || num2.equals("0")){
return "0";
}
List<StringBuilder> brokenUP = new ArrayList<StringBuilder>();
int count = 0;
for (int i=num1.length()-1;i>=0;i--){
char ch = num1.charAt(i);
StringBuilder result = new StringBuilder(String.valueOf(ch));
for (int j=0;j<count;j++){
result.append('0');
}
count++;
}

List<StringBuilder> multiplicationResults = new ArrayList<StringBuilder>();
for (StringBuilder s: brokenUP){
int carry = 0;
int number = s.charAt(0)-'0';
StringBuilder result = new StringBuilder();
for (int j=num2.length()-1;j>=0;j--){
int ch =  num2.charAt(j)-'0';
int val = number*ch + carry;
carry = val/10;
result.append(val%10);
}
if (carry>0){
result.append(carry);
}
for (int j=0;j<s.length()-1;j++){
result.insert(0, '0');
}
}
StringBuilder sum = multiplicationResults.remove(multiplicationResults.size()-1);

for (StringBuilder toAdd : multiplicationResults){
int carry = 0;
StringBuilder newSum = new StringBuilder();
int c1 = toAdd.charAt(j)-'0';
int c2 = sum.charAt(j)-'0';
int val = c1+c2+carry;
carry = val/10;
newSum.append(val%10);
}
for (int k = toAdd.length();k<sum.length();k++){
int c2 = sum.charAt(k)-'0';
int val = c2+carry;
carry = val/10;
newSum.append(val%10);
}
if (carry>0){
newSum.append(carry);
}
sum = newSum;
}
return sum.reverse().toString();
}
}``````

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