java bitset

BitSet类cardinality()方法 (BitSet Class cardinality() method)

• cardinality() method is available in java.util package.

  cardinality()方法在java.util包中可用。

• cardinality() method is used to return the cardinality (i.e. the number of bits is set to true by using set() method ) in this Bitset.

  cardinality()方法用于返回此Bitset中的基数(即，通过使用set()方法将位数设置为true)。

• cardinality() method is a non-static method, so it is accessible with the class object and if we try to access the method with the class name then we will get an error.

  cardinality()方法是一种非静态方法，因此可以通过类对象进行访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• cardinality() method does not throw an exception at the time of returning cardinality of this Bitset.

  返回此Bitset的基数时， cardinality()方法不会引发异常。

Syntax:

句法：

    public int cardinality();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is int, it returns the cardinality of this Bitset.

此方法的返回类型为int ，它返回此Bitset的基数。

Example:

例：

// Java program to demonstrate the example 
// of int cardinality() method of BitSet.
import java.util.*;
public class CardinalityOfBitSet {
public static void main(String[] args) {
// create an object of BitSet
BitSet bs = new BitSet(10);
// By using set() method is to set
// the values in BitSet 
bs.set(10);
bs.set(20);
bs.set(30);
bs.set(40);
bs.set(50);
// Display Bitset
System.out.println("bs :" + bs);
// By using cardinality() method is to return
// the number of bits in this BitSet
int cardinality = bs.cardinality();
// Display BitSet 2
System.out.println("bs.cardinality()  : " + cardinality);
}
}

Output

输出量

bs :{10, 20, 30, 40, 50}
bs.cardinality()  : 5

翻译自: https://www.includehelp.com/java/bitset-cardinality-method-with-example.aspx

java bitset