java.math.BigInteger.intValueExact() was introduced in Java 8. It is an inbuilt function which converts the value of BigInteger to a int and checks for lost information. If the value of BigInteger is greater than 2,147,483,647 or less than -2,147,483,648; the method will throw ArithmeticException as BigInteger doesn’t fit in int range.
Syntax:
public int intValueExact()
Return Value: This method returns the int value of this BigInteger.
Exception: The method throws ArithmeticException if the value of BigInteger is greater than 2,147,483,647 or less than -2,147,483,648; as this range doesn’t fit in int range.
Example:
Input: 4561561 Output: 4561561 Explanation: 4561561 is given as input which is bigInteger and int value of 4561561 is 4561561 Input: -8546512 Output: -8546512 Explanation: -8546512 is given as input which is bigInteger and int value of -8546512 is -8546512 Input: 3000000000 Output: ArithmeticException Explanation: When 3000000000 is tried to convert to int, since 3000000000 > 2,147,483,647 (greater than a int's range), therefore it throws an arithmetic exception.
Below programs illustrates intValueExact() method of BigInteger class:
Program 1: To demonstrate intValueExact() method for positive number <2,147,483,647
// Java program to demonstrate intValueExact() // method of BigInteger Class import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big;
big = new BigInteger( "4561561" );
// print value of BigInteger
System.out.println( "BigInteger value : "
+ big);
// convert big to the int value
int b1 = big.intValueExact();
// print int value
System.out.println( "int converted value : "
+ b1);
}
} |
BigInteger value : 4561561 int converted value : 4561561
Program 2: To demonstrate intValueExact() method for negative number >-2,147,483,648
// Java program to demonstrate intValueExact() // method of BigInteger Class import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger( "-8546512" );
// print value of BigInteger
System.out.println( "BigInteger value : "
+ big);
// convert big to the int value
int b1 = big.intValueExact();
// print int value
System.out.println( "int converted value : "
+ b1);
}
} |
BigInteger value : -8546512 int converted value : -8546512
Program 3: To demonstrate intValueExact() method for negative number <-2,147,483,648. It will throw Arithmetic Exception
// Java program to demonstrate intValueExact() // method of BigInteger Class import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger( "-3000000000" );
// print value of BigInteger
System.out.println( "BigInteger value : "
+ big);
try {
// convert big to the int value
int b1 = big.intValueExact();
// print int value
System.out.println( "int converted value : "
+ b1);
}
catch (Exception e) {
System.out.println( "Exception: " + e);
}
}
} |
BigInteger value : -3000000000 Exception: java.lang.ArithmeticException: BigInteger out of int range
Program 4: To demonstrate intValueExact() method for positive number >2,147,483,647. It will throw Arithmetic Exception
// Java program to demonstrate intValueExact() // method of BigInteger Class import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger( "3000000000" );
// print value of BigInteger
System.out.println( "BigInteger value : "
+ big);
try {
// convert big to the int value
int b1 = big.intValueExact();
// print int value
System.out.println( "int converted value : "
+ b1);
}
catch (Exception e) {
System.out.println( "Exception: " + e);
}
}
} |
BigInteger value : 3000000000 Exception: java.lang.ArithmeticException: BigInteger out of int range
Reference: https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#intValueExact–