Guava – IntMath.checkedPow()方法及实例

Guava – IntMath.checkedPow()方法及示例

checkedPow(int b, int k)是Guava的一个方法。 IntMath类 它接受两个参数 b and k 并用于寻找b的k次方。

语法:

public static int checkedPow(int b, int k)

参数: 该方法接受两个参数,b和k。参数b被称为基数,它被提高到k次方。

返回值: 该方法返回b的k次方。

异常情况: 如果b的k次方在有符号int算术中溢出,方法checkedPow(int b, int k)将抛出ArithmeticException。

下面的例子说明了上述方法的实现。

例1:

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

输出:

5 to the 7th power is: 78125
19 to the 4th power is: 130321

例2:

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

输出:

java.lang.ArithmeticException: overflow

参考资料:

https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/IntMath.html#checkedPow-int-int-

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