Java BigDecimal longValueExact() Method with Example

BigDecimal Class longValueExact() method: Here, we are going to learn about the longValueExact() method of BigDecimal Class with its syntax and example.
Submitted by Preeti Jain, on May 04, 2020

BigDecimal Class longValueExact() method

  • longValueExact() method is available in java.math package.
  • longValueExact() method is used to convert this BigDecimal to an exact long value. When this BigDecimal holds a fractional part other than 0 or not in a range to represent long then ArithmeticException is thrown.
  • longValueExact() 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.
  • longValueExact() method may throw an exception at the time of converting BigDecimal to the long.
    ArithmeticException: This exception may throw when this BigDecimal holds a fractional part that is other than 0 or the resulting value is not enough to adjust in a long.


    public long longValueExact();


  • It does not accept any parameter.

Return value:

The return type of this method is long, it gets the long representation of this BigDecimal.


// Java program to demonstrate the example 
// of long longValueExact() method of BigDecimal

import java.math.*;

public class LongValueExactOfBD {
    public static void main(String args[]) {
        // Initialize two variables first is
        // of "float" and second is of "String"
        // type
        float val = 11562387.23f;
        String str = "100";

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

        // convert this BigDecimal (b_dec1) into
        // a exact long, variable named l_conv
        long l_conv = b_dec1.longValueExact();
        System.out.println("b_dec1.longValueExact(): " + l_conv);

        // convert this BigDecimal (b_dec2) into
        // a exact long, variable named l_conv
        l_conv = b_dec2.longValueExact();
        System.out.println("b_dec2.longValueExact(): " + l_conv);


b_dec1.longValueExact(): 11562387
b_dec2.longValueExact(): 100

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