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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。

欢马劈雪

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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;
/**
 * 时 代 J a v a - N o w J a v a . c o m 提 供 
**/

public class Main {

public static void main(String[] argv) throws Exception {

int bitset = 2;

int fromIndex = 2;

System.out.println(nextSetBit(bitset, fromIndex));

}

/** maximum index of a bitset (minimum index is 0) */

public static final int MAX_INDEX = 31;
    /* 
    *来 自
     时代Java公众号 - nowjava.com
    */

/** int with all bits set */

public static final int INT_MASK = 0xffffffff;

/**

* Returns the index of the first bit that is set to <code>true</code> that

* occurs on or after the specified starting index. If no such bit exists

* then -1 is returned.

* To iterate over the <code>true</code> bits in a bitset, use the following

* loop:

* <pre>

* for (int i = nextSetBit(bitset, 0); i >= 0; i = nextSetBit(bitset, i + 1))

*     ; // do something

* </pre>

* @param  bitset

*         a bitset.

* @param  fromIndex

*         the bit index after which the first bit that is set to

*         <code>true</code> is returned.

* @return the index of the first bit that is set to <code>true</code> that

*         occurs on or after the specified starting index

* @throws IndexOutOfBoundsException

*         if the specified index is negative

public static int nextSetBit(int bitset, int fromIndex)

throws IndexOutOfBoundsException {

checkIndexRange(fromIndex, Integer.MAX_VALUE);

if (fromIndex > MAX_INDEX)

return -1;

bitset &= (INT_MASK << fromIndex);

if (bitset != 0)

return Integer.numberOfTrailingZeros(bitset);

return -1;

}

/**

* Throws an {@link IndexOutOfBoundsException} if the given bit index is

* negative or if it the second argument is <code>true</code> also if the

* index is greater than {@link #MAX_INDEX}.

* 
/**代码未完, 请加载全部代码(NowJava.com).**/

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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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