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Java 将指定索引处的位设置为true。
将指定索引处的位设置为true。
实例源码：
源代码：
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//package com.nowjava;/**来自 nowjava.com - 时代Java**/4
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public class Main {7
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public static void main(String[] argv) throws Exception {9
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int bitset = 2;11
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int bitIndex = 2;13
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System.out.println(set(bitset, bitIndex));15
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}17
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/** maximum index of a bitset (minimum index is 0) */20
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public static final int MAX_INDEX = 31;22
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/** int with all bits set */24
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public static final int INT_MASK = 0xffffffff;26
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/**29
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* Sets the bit at the specified index to <code>true</code>.31
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* 33
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* @param bitset35
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* a bitset.37
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* @param bitIndex39
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* a bit index.41
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* @return the bitset with the set bit.43
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* @throws IndexOutOfBoundsException45
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* if the specified index is negative or greater than47
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* {@link #MAX_INDEX}49
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*/51
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public static int set(int bitset, int bitIndex)53
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throws IndexOutOfBoundsException {55
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checkIndexRange(bitIndex, MAX_INDEX);57
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return bitset | (1 << bitIndex);59
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}61
/*nowjava - 时代Java*/62
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/**64
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* Sets the bits from the specified <tt>fromIndex</tt> (inclusive) to the66
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* specified <tt>toIndex</tt> (exclusive) to <code>true</code>.68
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* 70
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* @param bitset72
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* @param fromIndex74
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* index of the first bit to be set.76
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* @param toIndex78
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* index after the last bit to be set.80
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* @return82
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* @throws IndexOutOfBoundsException84
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* if <tt>fromIndex</tt> is negative,86
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* or <tt>toIndex</tt> is negative, or <tt>fromIndex</tt> is88
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* larger than <tt>toIndex</tt>.90
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* @throws IllegalArgumentException92
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*/94
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public static int set(int bitset, int fromIndex, int toIndex)96
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throws IndexOutOfBoundsException, IllegalArgumentException {98
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checkIndexRange(fromIndex, MAX_INDEX);100
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checkIndexRange(toIndex, MAX_INDEX + 1);102
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if (fromIndex > toIndex)104
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throw new IllegalArgumentException(106
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"fromIndex parameter must be lower or equal to toIndex parameter");108
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int mask = INT_MASK << fromIndex;110
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mask &= INT_MASK >>> -toIndex;112
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return bitset | mask;114
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}116
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/**119
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* Throws an {@link IndexOutOfBoundsException} if the given bit index is121
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* negative or if it the second argument is <code>true</code> also if the123
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