Java 8 | BigInteger byteevalueexact()方法，带示例
原文:https://www . geesforgeks . org/Java-8-big integer-byteevalueexact-method-with-examples/
Java 8 中引入了 Java . math . big integer . byteevalueexact()。这是一个内置函数，它将 BigInteger 的值转换为一个字节，并检查任何丢失的信息。如果大整数的值大于 127 或小于-128，该方法将抛出算术异常，因为大整数不适合字节范围。
语法:
public byte byteValueExact()
返回值:这个方法返回这个 BigInteger 的字节值。
异常:如果 BigInteger 的值大于 127 或小于-128，该方法将抛出算术异常，因为该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.
下面的程序说明了 BigInteger 类的 byteValueExact()方法:
程序 1: 演示正数<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);
}
}
T5】的 byteValueExact()方法输出:
BigInteger value : 122
Byte converted value : 122
程序二:演示负数> -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);
}
}
的 byteValueExact()方法输出:
BigInteger value : -46
Byte converted value : -46
程序 3: 演示负数< -128 的 byteValueExact()方法。它会抛出算术异常
// 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: 演示正数> 127 的 byteValueExact()方法。它会抛出算术异常
// 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/javae/8/docs/API/Java/math/big integer . html # bytevalueexact】
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