Java BigDecimal toBigIntegerExact() Method with Example

BigDecimal Class toBigIntegerExact() method: Here, we are going to learn about the toBigIntegerExact() method of BigDecimal Class with its syntax and example.
Submitted by Preeti Jain, on May 07, 2020

BigDecimal Class toBigIntegerExact() method

  • toBigIntegerExact() method is available in java.math package.
  • toBigIntegerExact() method is used to convert this BigDecimal into the exact BigInteger value and it will throw an exception when this BigDecimal holds some fractional part that is other than 0.
  • toBigIntegerExact() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • toBigIntegerExact() method may throw an exception at the time of converting this object into BigInteger.
    ArithmeticException: This exception may throw when this BigDecimal object holds a decimal part that is other than 0.


    public BigInteger toBigIntegerExact();


  • It does not accept any parameter.

Return value:

The return type of this method is BigInteger, it returns the exact conversion of this BigDecimal object value to a BigInteger value.


// Java program to demonstrate the example 
// of BigInteger toBigIntegerExact() method of BigDecimal

import java.math.*;

public class ToBigIntegerExactOfBD {
    public static void main(String args[]) {
        // Initialize two variables - double and 
        // String type
        double val = 1234521.0;
        String str = "1211124";

        // Initialize two BigDecimal objects  
        BigDecimal b_dec1 = new BigDecimal(val);
        BigDecimal b_dec2 = new BigDecimal(str);

        /* In this method it throws an exception
         when we pass any non-zero value after 
         decimal in this BigDecimal */

        // converts this BigDecimal b_dec1 value into
        // an exact BigInteger value, and store the result
        // in a variable named b_int_conv
        BigInteger b_int_conv = b_dec1.toBigIntegerExact();
        System.out.println("b_dec1.toBigIntegerExact(): " + b_int_conv);

        // converts this BigDecimal b_dec2 value into
        // an exact BigInteger value, and store the result
        // in a variable named b_int_conv
        b_int_conv = b_dec2.toBigIntegerExact();
        System.out.println("b_dec2.toBigIntegerExact(): " + b_int_conv);


b_dec1.toBigIntegerExact(): 1234521
b_dec2.toBigIntegerExact(): 1211124

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