BigDecimal toBigInteger() Method in Java

The java.math.BigDecimal.toBigInteger() is an inbuilt method in java that converts this BigDecimal to a BigInteger. This conversion is analogous to the narrowing primitive conversion from double to long. Any fractional part of this BigDecimal will be discarded. This conversion can lose information about the precision of the BigDecimal value.

Note: If an exception is thrown in the conversion inexact (in other words if a nonzero fractional part is discarded), use the toBigIntegerExact() method.

Syntax:

public BigInteger toBigInteger()

Parameters: This method does not accepts any parameters.
Return value: This method returns the value of BigDecimal object converted to a BigInteger.

Examples:

Input: (BigDecimal) 123.321
Output: (BigInteger) 123

Input: (BigDecimal) 123.001
Output: (BigInteger) 123

Below programs illustrate the working of the above-mentioned method: 

Program 1:

Java

// Program to demonstrate toBigInteger() method of BigDecimal

import java.math.*;

public class GFG {

    public static void main(String[] args)
    {

        // Assigning the BigDecimal b
        BigDecimal b = new BigDecimal("123.321");

        // Assigning the BigInteger value of  BigDecimal b to  BigInteger i
        BigInteger i = b.toBigInteger();

        // Print i value
        System.out.println("BigInteger value of " + b + " is " + i);
    }
}

Output:

BigInteger value of 123.321 is 123

Program 2:

Java

// Program to demonstrate toBigInteger() method of BigDecimal

import java.math.*;

public class GFG {

    public static void main(String[] args)
    {

        // Assigning the BigDecimal b
        BigDecimal b = new BigDecimal("123.001");

        // Assigning the BigInteger value of  BigDecimal b to  BigInteger i
        BigInteger i = b.toBigInteger();

        // Printing i value
        System.out.println("BigInteger value of " + b + " is " + i);
    }
}

Output:

BigInteger value of 123.001 is 123

Reference: https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#toBigInteger()