bitcount方法詳解

長類bitCount()方法 (Long class bitCount() method)

• bitCount() method is available in java.lang package.

  bitCount()方法在java.lang包中可用。

• bitCount() method is used to find the number of 1's bits in the 2's complement binary denotation of the given parameter [value] of long type.

  bitCount()方法用于查找long類型給定參數[value]的2的補碼二進制表示形式中的1的位數。

• bitCount() method is a static method, it is accessible with the class name too and if we try to access the method with the class object then also we will not get an error.

  bitCount()方法是一個靜態方法，也可以使用類名進行訪問，如果嘗試使用類對象訪問該方法，那么也不會收到錯誤。

• bitCount() method does not throw an exception at the time of counting bits.

  在對位進行計數時， bitCount()方法不會引發異常。

Syntax:

句法：

    public static int bitCount(long value);

Parameter(s):

參數：

• long value – represents the long value to be parsed.

  long value –表示要解析的long值。

Return value:

返回值：

The return type of this method is int, it returns the number of 1's bits in the 2's complements of the given long value.

此方法的返回類型為int ，它返回給定long值的2的補碼中的1的位數。

Example:

例：

// Java program to demonstrate the example 
// of bitCount(long value) method of Long class
public class BitCountOfLongClass {
public static void main(String[] args) {
long value = 1296;
// It returns the string representation of the given unsigned 
// long value denoted by the argument in binary by calling
// Long.toBinaryString(value)
System.out.println("Long.toBinaryString(value): " + Long.toBinaryString(value));
// It returns the number of 1's bits in 2's complement 
// of the given argument 'value' by calling Long.bitCount(value)
System.out.println("Long.bitCount(value): " + Long.bitCount(value));
}
}

Output

輸出量

Long.toBinaryString(value): 10100010000
Long.bitCount(value): 3

翻譯自: https://www.includehelp.com/java/long-class-bitcount-method-with-example.aspx

bitcount方法詳解