bitcount方法详解

长类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类型给定参数[value]的2的补码二进制表示形式中的1的位数。

• 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()方法是一个静态方法，也可以使用类名进行访问，如果尝试使用类对象访问该方法，那么也不会收到错误。

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

  在对位进行计数时， bitCount()方法不会引发异常。

Syntax:

句法：

    public static int bitCount(long value);

Parameter(s):

参数：

• 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.

此方法的返回类型为int ，它返回给定long值的2的补码中的1的位数。

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

输出量

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

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

bitcount方法详解