Guava – LongMath.checkedPow方法与实例

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Guava – LongMath.checkedPow方法与实例

checkedPow(long b, long k)是Guava的LongMath类的一个方法，它接受两个参数b和k，用来寻找b的k次方.

语法:

public static long checkedPow(long b, long k)

参数: 该方法接受两个参数，b和k。参数b被称为base，它被提高到k次方.

返回值: 该方法返回b的k次方.

异常: 如果b的k次方在有符号长运算中溢出，方法checkedPow(long b, long k)会抛出算术异常.

下面的例子说明了上述方法的实施情况:

示例1:

// Java code to show implementation of// checkedPow(long b, long k) method of// Guava's LongMath class  import java.math.RoundingMode;import com.google.common.math.LongMath;  class GFG {      // Driver code    public static void main(String args[])    {        long b1 = 5;        int k1 = 7;          // Using checkedPow(long b, long k) method        // of Guava's LongMath class        long ans1 = LongMath.checkedPow(b1, k1);          System.out.println(b1 + " to the "                           + k1 + "th power is: "                           + ans1);          long b2 = 19;        int k2 = 4;          // Using checkedPow(long b, long k) method        // of Guava's LongMath class        long ans2 = LongMath.checkedPow(b2, k2);          System.out.println(b2 + " to the " + k2                           + "th power is: "                           + ans2);    }}

输出:

5 to the 7th power is: 7812519 to the 4th power is: 130321

示例2:

// Java code to show implementation of// checkedPow(long b, long k) method of// Guava's LongMath class  import java.math.RoundingMode;import com.google.common.math.LongMath;  class GFG {      static long findPow(long b, int k)    {        try {              // Using checkedPow(long b, long k) method of            // Guava's LongMath class            // This should raise "ArithmeticException" as            // b to the kth power overflows in            // signed long arithmetic            long ans = LongMath.checkedPow(b, k);              // Return the answer            return ans;        }        catch (Exception e) {            System.out.println(e);            return -1;        }    }      // Driver code    public static void main(String args[])    {        long b = 20;        int k = 25;          try {              // Function calling            findPow(b, k);        }        catch (Exception e) {            System.out.println(e);        }    }}

输出: