Java 8 BigInteger shortValueExact()用法及代码示例

Java 8中引入了java.math.BigInteger.shortValueExact()。这是一个内置函数，可将BigInteger的值转换为short值并检查丢失的信息。如果BigInteger的值大于32,767或小于-32,768；该方法将抛出ArithmeticException，因为BigInteger不能在短范围内使用。

用法:

public short shortValueExact()

返回值：此方法返回此BigInteger的short值。

异常：如果BigInteger的值大于32,767或小于-32,768，则该方法引发ArithmeticException。因为此范围不适用于短距离范围。

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.

以下示例程序旨在说明BigInteger类的shortValueExact()方法：

程序1:演示正数<32,767的shortValueExact()方法

// 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); 
    } 
}

输出：

BigInteger value:15564
short converted value:15564

程序2:演示shortValueExact()方法用于负数> -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); 
    } 
}

输出：

BigInteger value:-17584
short converted value:-17584

程序3:演示shortValueExact()方法用于负数<-32,768。它将引发算术异常

// 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:演示用于大于32,767的正数的shortValueExact()方法。它将引发算术异常

// 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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注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 Java 8 | BigInteger shortValueExact() Method with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。