java bitset

BitSet類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中的基數(即，通過使用set()方法將位數設置為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()方法是一種非靜態方法，因此可以通過類對象進行訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

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

  返回此Bitset的基數時， cardinality()方法不會引發異常。

Syntax:

句法：

public int cardinality();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

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

此方法的返回類型為int ，它返回此Bitset的基數。

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 BitSetBitSet 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 BitsetSystem.out.println("bs :" + bs);// By using cardinality() method is to return// the number of bits in this BitSetint cardinality = bs.cardinality();// Display BitSet 2System.out.println("bs.cardinality() : " + cardinality);} }

Output

輸出量

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

翻譯自: https://www.includehelp.com/java/bitset-cardinality-method-with-example.aspx

java bitset

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