Java Guava LongMath isPowerOfTwo(long x)用法及代码示例

Guava LongMath类的isPowerOfTwo(long x)方法用于检查数字是否为2的幂。它接受要检查的数字作为参数，并根据数字是否为2的幂返回布尔值true或false。

用法:

public static boolean isPowerOfTwo(long x)

参数：此方法接受单个参数x，该参数为long类型，将检查其2的幂。

返回值：此方法返回一个布尔值。如果x代表2的幂，则返回true；如果x不代表2的幂，则返回false。

异常：该方法不会引发任何异常。

注意：这不同于Long.bitCount(x)== 1，因为Long.bitCount(Long.MIN_VALUE)== 1，但Long.MIN_VALUE不是2的幂。

范例1：

// Java code to show implementation of 
// isPowerOfTwo(long x) 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 n1 = 52; 
  
        // Using isPowerOfTwo(long x) method 
        // of Guava's LongMath class 
        if (LongMath.isPowerOfTwo(n1)) 
            System.out.println(n1 
                               + " is power of 2"); 
        else
            System.out.println(n1 
                               + " is not power of 2"); 
  
        long n2 = 4; 
  
        // Using isPowerOfTwo(long x) method 
        // of Guava's LongMath class 
        if (LongMath.isPowerOfTwo(n2)) 
            System.out.println(n2 
                               + " is power of 2"); 
        else
            System.out.println(n2 
                               + " is not power of 2"); 
    } 
}

输出：

52 is not power of 2
4 is power of 2

范例2：

// Java code to show implementation of 
// isPowerOfTwo(long x) 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 n1 = 256; 
  
        // Using isPowerOfTwo(long x) method 
        // of Guava's LongMath class 
        if (LongMath.isPowerOfTwo(n1)) 
            System.out.println(n1 
                               + " is power of 2"); 
        else
            System.out.println(n1 
                               + " is not power of 2"); 
  
        long n2 = 4096; 
  
        // Using isPowerOfTwo(long x) method 
        // of Guava's LongMath class 
        if (LongMath.isPowerOfTwo(n2)) 
            System.out.println(n2 
                               + " is power of 2"); 
        else
            System.out.println(n2 
                               + " is not power of 2"); 
    } 
}

输出：

256 is power of 2
4096 is power of 2

参考： https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/LongMath.html#isPowerOfTwo-long-

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注：本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 Java Guava | isPowerOfTwo(long x) of LongMath Class 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。