Java BitSet cardinality()用法及代码示例

BitSet是java.util包中定义的类。它创建一个由0和1表示的位数组。

句法

public int cardinality()

说明：
该方法在此BitSet中返回1的数量。

例子：

Input:
set1:{1, 2, 4}
set2:{}

Output:
3
0

// Java program illustrating Bitset Class functions. 
import java.util.*; 
public class GFG { 
    public static void main(String[] args) 
    { 
        // Constructors of BitSet class 
        BitSet bs1 = new BitSet(); 
        BitSet bs2 = new BitSet(); 
        BitSet bs3 = new BitSet(); 
  
        /* set is BitSet class method 
        expalined in next articles */
        bs1.set(0); 
        bs1.set(1); 
        bs1.set(2); 
        bs1.set(4); 
  
        // assign values to bs2 
        bs2.set(4); 
        bs2.set(6); 
        bs2.set(5); 
        bs2.set(1); 
        bs2.set(2); 
        bs2.set(3); 
  
        // Printing the 2 Bitsets 
        System.out.println("bs1:" + bs1); 
        System.out.println("bs2:" + bs2); 
        System.out.println("bs3:" + bs3); 
  
        // Performing logical AND 
        // on bs2 set with bs1 
        System.out.println(bs1.cardinality()); 
        System.out.println(bs2.cardinality()); 
        System.out.println(bs3.cardinality()); 
    } 
}

输出：

bs1:{0, 1, 2, 4}
bs2:{1, 2, 3, 4, 5, 6}
bs3:{}
4
6
0

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注：本文由纯净天空筛选整理自barykrg大神的英文原创作品 Java BitSet | cardinality()。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。