BigInteger pow() Method in Java

The java.math.BigInteger.pow(int exponent) method is used to calculate a BigInteger raise to the power of some other number passed as exponent whose value is equal to (this)^exponent. This method performs operation upon the current BigInteger by which this method is called and exponent passed as parameter. 
Syntax:

public BigInteger pow(int exponent)

Parameter: This method accepts a parameter exponent which is the exponent to which this BigInteger should be raised to. 
Returns:
This method returns a BigInteger which is equal to (this)^exponent. 
Exception:
The parameter exponent must be positive number (exponent >= 0) otherwise ArithmeticException is thrown. 
Examples:

Input: BigInteger1=321456, exponent=5
Output: 3432477361331488865859403776
Explanation: BigInteger1.pow(exponent)=3432477361331488865859403776. 
321456^5=3432477361331488865859403776

Input: BigInteger1=45321, exponent=3
Output: 93089018611161
Explanation: BigInteger1.pow(exponent)=93089018611161. 
321456^5=93089018611161

Below programs illustrate pow() method of BigInteger class
Example 1:

Java

// Java program to demonstrate
// pow() method of BigInteger

import java.math.BigInteger;

public class GFG {

    public static void main(String[] args)
    {

        // Creating BigInteger object
        BigInteger b1;

        b1 = new BigInteger("321456");
        int exponent = 5;

        // apply pow() method
        BigInteger result = b1.pow(exponent);

        // print result
        System.out.println("Result of pow operation between BigInteger "
             + b1 + " and exponent " + exponent + " equal to " + result);
    }
}

Output:

Result of pow operation between BigInteger 321456 and exponent 5 equal 
to 3432477361331488865859403776 

Example 2: 

Java

// Java program to demonstrate
// pow() method of BigInteger

import java.math.BigInteger;

public class GFG {

    public static void main(String[] args)
    {

        // Creating BigInteger object
        BigInteger b1;

        b1 = new BigInteger("12346");
        int exponent = 6;

        // apply pow() method
        BigInteger result = b1.pow(exponent);

        // print result
        System.out.println("Result of pow operation between BigInteger "
             + b1 + " and exponent " + exponent + " equal to " + result);
    }
}

Output:

Result of pow operation between BigInteger 41432345678 and exponent 6 equal to 5058679076487529899393537031261743031889730764186441745527485504 

Example 3:
Program showing exception when exponent passed as parameter is less than zero. 

Java

// Java program to demonstrate
// pow() method of BigInteger

import java.math.BigInteger;

public class GFG {

    public static void main(String[] args)
    {

        // Creating BigInteger object
        BigInteger b1;

        b1 = new BigInteger("76543");
        int exponent = -17;

        try {

        // apply pow() method
        BigInteger result = b1.pow(exponent);

        // print result
        System.out.println("Result of pow operation between " + b1
                           + " and " + exponent + " equal to " + result);
          }
        catch (Exception e) {
            System.out.println(e);
        }

    }
}

Output:

java.lang.ArithmeticException: Negative exponent 

Reference:https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/math/BigInteger.html#pow(int)