Java – Find the length of BigInteger?

In Java, we can convert the BigInteger to a String object and get the length of the String.

package com.mkyong;

import java.math.BigInteger;

public class JavaExample {

    public static void main(String[] args) {

        BigInteger bigInteger = BigInteger.valueOf(100000000000000000L); //18
        System.out.println(bigInteger.toString().length());
        
    }

}

Output

18

References

1. BigInteger JavaDoc
2. Quora – What are the limits of String Size and BigInteger in Java?