Java BitSet | cardinality()
位集是在 java.util 包中定义的一个类。它创建了一个由 0 和 1 表示的位数组。
语法
public int cardinality()
说明:
该方法返回该位集中的 1 个数。
示例:
Input :
set1 : {1, 2, 4}
set2 : {}
Output :
3
0
Java
// 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
explained 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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