Java 8中引入了java.math.BigInteger.byteValueExact()。它是一个内置函数,可将BigInteger的值转换为字节,并检查是否丢失任何信息。如果BigInteger的值大于127或小于-128,则该方法将抛出ArithmeticException,因为BigInteger不在字节范围内。
用法:
public byte byteValueExact()
返回值:此方法返回此BigInteger的字节值。
异常:如果BigInteger的值大于127或小于-128,则此方法将引发ArithmeticException,因为此范围不适合字节范围。
例:
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.
以下示例程序旨在说明BigInteger类的byteValueExact()方法:
程序1:演示byteValueExact()方法的正数<127
// Java program to demonstrate byteValueExact()
// 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("122");
// print value of BigInteger
System.out.println("BigInteger value:"
+ big);
// convert big to the byte value
byte b1 = big.byteValueExact();
// print byte value
System.out.println("Byte converted value:"
+ b1);
}
}
输出:
BigInteger value:122 Byte converted value:122
程序2:演示byteValueExact()方法用于负数> -128
// Java program to demonstrate byteValueExact()
// method of BigInteger Class
import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger("-46");
// print value of BigInteger
System.out.println("BigInteger value:"
+ big);
// convert big to the byte value
byte b1 = big.byteValueExact();
// print byte value
System.out.println("Byte converted value:"
+ b1);
}
}
输出:
BigInteger value:-46 Byte converted value:-46
程序3:演示用于负数<-128的byteValueExact()方法。它将引发算术异常
// Java program to demonstrate byteValueExact()
// method of BigInteger Class
import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger("-200");
// print value of BigInteger
System.out.println("BigInteger value:"
+ big);
try {
// convert big to the byte value
byte b1 = big.byteValueExact();
// print byte value
System.out.println("Byte converted value:"
+ b1);
}
catch (Exception e) {
System.out.println("Exception:" + e);
}
}
}
输出:
BigInteger value:-200 Exception:java.lang.ArithmeticException:BigInteger out of byte range
程序4:演示byteValueExact()方法用于正数> 127。它将引发算术异常
// Java program to demonstrate byteValueExact()
// method of BigInteger Class
import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger("200");
// print value of BigInteger
System.out.println("BigInteger value:"
+ big);
try {
// convert big to the byte value
byte b1 = big.byteValueExact();
// print byte value
System.out.println("Byte converted value:"
+ b1);
}
catch (Exception e) {
System.out.println("Exception:" + e);
}
}
}
输出:
BigInteger value:200 Exception:java.lang.ArithmeticException:BigInteger out of byte range
参考: https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#byteValueExact-
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