Java BitSet nextClearBit()用法及代码示例

BitSet是java.util包中定义的类。它创建一个由布尔值表示的位数组。

nextClearBit()方法：
BitSet类中的此方法用于返回在指定的起始索引上或之后出现的设置为false的第一位的索引。

用法:

public int nextClearBit(int fromIndex)

参数：此方法采用强制性参数fromIndex，该参数是从(包括)开始检查下一个错误位的索引。

返回值：此方法返回下一个清除位的索引，即设置为false的第一位的索引出现在指定的起始索引上或之后。

异常：如果指定的索引为负，则此方法将引发IndexOutOfBoundsException。

示例1:要显示nextClearBit()函数的实现：

// Java program illustrating Bitset 
// nextClearBit() function. 
  
import java.util.*; 
public class GFG { 
    public static void main(String[] args) 
    { 
        // Constructors of BitSet class 
        BitSet bs1 = new BitSet(); 
        BitSet bs2 = new BitSet(); 
  
        /* assigning values to set1*/
        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); 
        bs2.set(12); 
  
        // Printing the 2 Bitsets 
        System.out.println("bs1 : " + bs1); 
        System.out.println("bs2 : " + bs2); 
  
        // Print the first clear bit of bs1 
        System.out.println(bs1.nextClearBit(0)); 
  
        // Print the first clear bit of bs2 after index 3 
        System.out.println(bs2.nextClearBit(3)); 
    } 
}

输出：

bs1 : {0, 1, 2, 4}
bs2 : {1, 2, 3, 4, 5, 6, 12}
3
7

示例2:要显示IndexOutOfBoundException：

// Java program illustrating Bitset 
// nextClearBit() function. 
  
import java.util.*; 
public class GFG { 
    public static void main(String[] args) 
    { 
        // Constructors of BitSet class 
        BitSet bs1 = new BitSet(); 
        BitSet bs2 = new BitSet(); 
  
        /* assigning values to set1*/
        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); 
        bs2.set(12); 
  
        // Printing the 2 Bitsets 
        System.out.println("bs1 : " + bs1); 
        System.out.println("bs2 : " + bs2); 
  
        try { 
            // Passing -1 as parameter 
            System.out.println(bs1.nextClearBit(-1)); 
        } 
        catch (Exception e) { 
            System.out.println("Exception when "
                               + "negative index is passed "
                               + "as parameter : " + e); 
        } 
    } 
}

输出：

bs1 : {0, 1, 2, 4}
bs2 : {1, 2, 3, 4, 5, 6, 12}
Exception when negative index is passed as parameter : java.lang.IndexOutOfBoundsException: fromIndex

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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 BitSet nextClearBit() method in Java。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。