Java 8 |大整数短值精确()方法，带示例
原文:https://www . geesforgeks . org/Java-8-big integer-short value exact-method-with-examples/
Java . math . big integer . short value exact()在 Java 8 中引入。这是一个内置函数，它将 BigInteger 的值转换为一个短整型，并检查丢失的信息。如果 BigInteger 的值大于 32，767 或小于-32，768；该方法将抛出算术异常，因为大整数不适合短程。
语法:
public short shortValueExact()
返回值:这个方法返回这个 BigInteger 的短值。
异常:如果 BigInteger 的值大于 32，767 或小于-32，768，则该方法抛出算术异常；因为这个范围不适合短程。
例:
Input: 15,564
Output: 15,564
Explanation: 15,564 is given as input which is BigInteger
and short value of 15,564 is 15,564
Input: -17,584
Output: -17,584
Explanation: -17,584 is given as input which is BigInteger
and short value of -17,584 is -17,584
Input: 40000
Output: ArithmeticException
Explanation: When 40000 is tried to convert to short,
since 40000 > 32,767 (greater than a short's range),
therefore it throws an arithmetic exception.
下面的程序说明了 BigInteger 类的 shortValueExact()方法:
程序 1: 演示正数< 32，767
// Java program to demonstrate shortValueExact()
// 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("15564");
// print value of BigInteger
System.out.println("BigInteger value : "
+ big);
// convert big to the short value
short b1 = big.shortValueExact();
// print short value
System.out.println("short converted value : "
+ b1);
}
}
T5】的 shortValueExact()方法输出:
BigInteger value : 15564
short converted value : 15564
程序 2: 演示负数> -32，768
// Java program to demonstrate shortValueExact()
// method of BigInteger Class
import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger("-17584");
// print value of BigInteger
System.out.println("BigInteger value : "
+ big);
// convert big to the short value
short b1 = big.shortValueExact();
// print short value
System.out.println("short converted value : "
+ b1);
}
}
的 shortValueExact()方法输出:
BigInteger value : -17584
short converted value : -17584
程序 3: 演示负数< -32，768 的 shortValueExact()方法。它会抛出算术异常
// Java program to demonstrate shortValueExact()
// method of BigInteger Class
import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger("-40000");
// print value of BigInteger
System.out.println("BigInteger value : "
+ big);
try {
// convert big to the short value
short b1 = big.shortValueExact();
// print short value
System.out.println("short converted value : "
+ b1);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
输出:
BigInteger value : -40000
Exception: java.lang.ArithmeticException: BigInteger out of short range
程序 4: 演示正数> 32，767 的 shortValueExact()方法。它会抛出算术异常
// Java program to demonstrate shortValueExact()
// method of BigInteger Class
import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating a BigInteger object
BigInteger big = new BigInteger("40000");
// print value of BigInteger
System.out.println("BigInteger value : "
+ big);
try {
// convert big to the short value
short b1 = big.shortValueExact();
// print short value
System.out.println("short converted value : "
+ b1);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
输出:
BigInteger value : 40000
Exception: java.lang.ArithmeticException: BigInteger out of short range
参考:https://docs . Oracle . com/javase/8/docs/API/Java/math/biginteger . html # shortValueExact–
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