import java math

To use the java.math package in your Java program, you will need to import it at the beginning of your source file. Here is an example of how you can do this:

import java.math.*;

The java.math package contains several classes that provide mathematical operations and functions, such as the BigDecimal and BigInteger classes for handling large numbers, and the Math class for common mathematical operations such as trigonometric functions and logarithms.

Here is an example of using the BigInteger class to perform calculations with large numbers:

BigInteger x = new BigInteger("123456789123456789");
BigInteger y = new BigInteger("987654321987654321");
BigInteger sum = x.add(y);
System.out.println(sum);  // prints 11111111101111111110

You can also use the Math class to perform common mathematical operations, such as finding the square root of a number or calculating the sine of an angle. Here is an example of using the Math.sqrt method to find the square root of a number:

double x = 9.0;
double y = Math.sqrt(x);
System.out.println(y);  // prints 3.0