Java 8 | BigInteger byteValueExact() method with Examples
Last Updated :
04 Dec, 2018
java.math.BigInteger.byteValueExact() was introduced in Java 8. It is an inbuilt function which converts the value of BigInteger to a byte and checks for any lost information. If the value of BigInteger is greater than 127 or less than -128, the method will throw ArithmeticException as BigInteger doesn’t fit in byte range.
Syntax:
public byte byteValueExact()
Return Value: This method returns the byte value of this BigInteger.
Exception: The method throws ArithmeticException if the value of BigInteger is greater than 127 or less than -128, as this range doesn’t fit in byte range.
Example:
Input: 122
Output: 122
Explanation: 122 is given as input which is bigInteger
and byte value of 122 is 122
Input: -46
Output: -46
Explanation: -46 is given as input which is bigInteger
and byte value of -46 is -46
Input: 200
Output: ArithmeticException
Explanation: When 200 is tried to convert to Byte,
since 200 > 127 (greater than a Byte's range),
therefore it throws an arithmetic exception.
Below programs illustrates byteValueExact() method of BigInteger class:
Program 1: To demonstrate byteValueExact() method for positive number <127
import java.math.*;
public class GFG {
public static void main(String[] args)
{
BigInteger big;
big = new BigInteger("122");
System.out.println("BigInteger value : "
+ big);
byte b1 = big.byteValueExact();
System.out.println("Byte converted value : "
+ b1);
}
}
|
Output:
BigInteger value : 122
Byte converted value : 122
Program 2: To demonstrate byteValueExact() method for negative number >-128
import java.math.*;
public class GFG {
public static void main(String[] args)
{
BigInteger big = new BigInteger("-46");
System.out.println("BigInteger value : "
+ big);
byte b1 = big.byteValueExact();
System.out.println("Byte converted value : "
+ b1);
}
}
|
Output:
BigInteger value : -46
Byte converted value : -46
Program 3: To demonstrate byteValueExact() method for negative number <-128. It will throw Arithmetic Exception
import java.math.*;
public class GFG {
public static void main(String[] args)
{
BigInteger big = new BigInteger("-200");
System.out.println("BigInteger value : "
+ big);
try {
byte b1 = big.byteValueExact();
System.out.println("Byte converted value : "
+ b1);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
|
Output:
BigInteger value : -200
Exception: java.lang.ArithmeticException: BigInteger out of byte range
Program 4: To demonstrate byteValueExact() method for positive number >127. It will throw Arithmetic Exception
import java.math.*;
public class GFG {
public static void main(String[] args)
{
BigInteger big = new BigInteger("200");
System.out.println("BigInteger value : "
+ big);
try {
byte b1 = big.byteValueExact();
System.out.println("Byte converted value : "
+ b1);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
|
Output:
BigInteger value : 200
Exception: java.lang.ArithmeticException: BigInteger out of byte range
Reference: https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#byteValueExact–
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