Java Guava BigIntegerMath isPowerOfTwo()用法及代碼示例

如果x表示2的冪，則Guava的BigIntegerMath類的isPowerOfTwo(BigInteger x)方法將返回true。

用法:

public static boolean isPowerOfTwo(BigInteger x)

參數：此方法將BigInteger數字x作為要檢查的參數。

返回值：如果x為2的冪，則此方法返回true。

以下示例說明了BifIntegerMath.isPowerOfTwo()方法：

範例1：

// Java code to show implementation of 
// isPowerOfTwo(BigInteger x) method of 
// Guava's BigIntegerMath class 
  
import java.math.*; 
import com.google.common.math.BigIntegerMath; 
  
class GFG { 
  
    // Driver code 
    public static void main(String args[]) 
    { 
        BigInteger a1 = BigInteger.valueOf(63); 
  
        // Using isPowerOfTwo(BigInteger x) method 
        // of Guava's BigIntegerMath class 
        if (BigIntegerMath.isPowerOfTwo(a1)) 
            System.out.println(a1 + " is power of 2"); 
        else
            System.out.println(a1 + " is not power of 2"); 
  
        BigInteger a2 = BigInteger.valueOf(1024); 
  
        // Using isPowerOfTwo(BigInteger x) method 
        // of Guava's BigIntegerMath class 
        if (BigIntegerMath.isPowerOfTwo(a2)) 
            System.out.println(a2 + " is power of 2"); 
        else
            System.out.println(a2 + " is not power of 2"); 
    } 
}

輸出：

63 is not power of 2
1024 is power of 2

範例2：

// Java code to show implementation of 
// isPowerOfTwo(BigInteger x) method of 
// Guava's BigIntegerMath class 
  
import java.math.*; 
import com.google.common.math.BigIntegerMath; 
  
class GFG { 
  
    // Driver code 
    public static void main(String args[]) 
    { 
        BigInteger a1 = BigInteger.valueOf(1); 
  
        // Using isPowerOfTwo(BigInteger x) method 
        // of Guava's BigIntegerMath class 
        if (BigIntegerMath.isPowerOfTwo(a1)) 
            System.out.println(a1 + " is power of 2"); 
        else
            System.out.println(a1 + " is not power of 2"); 
  
        BigInteger a2 = BigInteger.valueOf(567); 
  
        // Using isPowerOfTwo(BigInteger x) method 
        // of Guava's BigIntegerMath class 
        if (BigIntegerMath.isPowerOfTwo(a2)) 
            System.out.println(a2 + " is power of 2"); 
        else
            System.out.println(a2 + " is not power of 2"); 
    } 
}

輸出：

1 is power of 2
567 is not power of 2

參考： https://google.github.io/guava/releases/21.0/api/docs/com/google/common/math/BigIntegerMath.html#isPowerOfTwo-java.math.BigInteger-

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