java.math.BigInteger.doubleValue()

Description Of BigInteger: doubleValue()

The java.math.BigInteger.doubleValue() converts this BigInteger to a double. This conversion is similar to the narrowing primitive conversion from double to float.

If this BigInteger has too great a magnitude to represent as a double, it will be converted to Double.NEGATIVE_INFINITY or Double.POSITIVE_INFINITY as appropriate. Even when the return value is finite, this conversion can lose information about the precision of the BigInteger value.

Code Example Java BigInteger

import java.math.BigInteger;

public class BigIntegerExam {
 public static void main(String[] args) {
  BigInteger bi1 = new BigInteger("123");
  BigInteger bi2 = new BigInteger("123456789123456789");

  double bi1Double = bi1.doubleValue();
  double bi2Double = bi2.doubleValue();

  String str1 = "Double value of " + bi1 + " is " + bi1Double;
  String str2 = "Double value of " + bi2 + " is " + bi2Double;

  // print d1, d2 values
  System.out.println(str1);
  System.out.println(str2);
 }
}