Java examples on java.math

How do I do math operation for BigInteger?

```package org.kodejava.example.math;

import java.math.BigInteger;

public class BigIntegerOperation {
public static void main(String[] args) {
BigInteger numberA = new BigInteger("98765432123456789");
BigInteger numberB = BigInteger.TEN;

System.out.println("numberA = " + numberA);

numberA = numberA.multiply(numberB);
System.out.println("numberA = " + numberA);

numberA = numberA.subtract(numberB);
System.out.println("numberA = " + numberA);

numberA = numberA.divide(numberB);
System.out.println("numberA = " + numberA);

numberA = numberA.mod(numberB);
System.out.println("numberA = " + numberA);

numberA = numberA.pow(2);
System.out.println("numberA = " + numberA);

numberA = numberA.negate();
System.out.println("numberA = " + numberA);
}
}
```

Our class result are:

```numberA = 98765432123456799
numberA = 987654321234567990
numberA = 987654321234567980
numberA = 98765432123456798
numberA = 8
numberA = 64
numberA = -64
```