Java 返回在指定的起始索引上或之后出现的设置为true的第一位的索引。
返回在指定的起始索引上或之后出现的设置为true的第一位的索引。
实例源码：
源代码：
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//package com.nowjava;4
/**5
* 时 代 J a v a - N o w J a v a . c o m 提 供 6
**/7
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public class Main {10
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public static void main(String[] argv) throws Exception {12
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int bitset = 2;14
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int fromIndex = 2;16
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System.out.println(nextSetBit(bitset, fromIndex));18
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}20
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/** maximum index of a bitset (minimum index is 0) */23
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public static final int MAX_INDEX = 31;25
/* 26
*来 自27
时代Java公众号 - nowjava.com28
*/29
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/** int with all bits set */31
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public static final int INT_MASK = 0xffffffff;33
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/**36
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* Returns the index of the first bit that is set to <code>true</code> that38
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* occurs on or after the specified starting index. If no such bit exists40
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* then -1 is returned.42
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* 44
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* To iterate over the <code>true</code> bits in a bitset, use the following46
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* loop:48
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* 50
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* <pre>52
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* for (int i = nextSetBit(bitset, 0); i >= 0; i = nextSetBit(bitset, i + 1))54
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* ; // do something56
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* </pre>58
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* 60
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* @param bitset62
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* a bitset.64
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* @param fromIndex66
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* the bit index after which the first bit that is set to68
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* <code>true</code> is returned.70
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* @return the index of the first bit that is set to <code>true</code> that72
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* occurs on or after the specified starting index74
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* @throws IndexOutOfBoundsException76
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* if the specified index is negative78
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*/80
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public static int nextSetBit(int bitset, int fromIndex)82
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throws IndexOutOfBoundsException {84
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checkIndexRange(fromIndex, Integer.MAX_VALUE);86
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if (fromIndex > MAX_INDEX)88
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return -1;90
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bitset &= (INT_MASK << fromIndex);92
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if (bitset != 0)94
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return Integer.numberOfTrailingZeros(bitset);96
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return -1;98
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}100
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/**103
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* Throws an {@link IndexOutOfBoundsException} if the given bit index is105
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* negative or if it the second argument is <code>true</code> also if the107
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* index is greater than {@link #MAX_INDEX}.109
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* 111
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