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Java 将指定的位获取为字节值
将指定的位获取为字节值
实例源码：
源代码：
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//package com.nowjava;4
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/*6
时 代 J a v a - nowjava.com 提供7
*/8
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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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byte value = 2;14
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int bit = 2;16
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System.out.println(getBit(value, bit));18
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}20
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/**23
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* gets the specified bit to a value25
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* @param value the value to check27
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* @param bit the bit number29
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* @return if this bit is on31
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*/33
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public static boolean getBit(byte value, int bit) {35
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if (bit < 0 || bit >= 8)37
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throw new IllegalArgumentException("invalid bit position");/*来 自 nowjava - 时 代 Java*/39
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byte pos = (byte) (1 << bit);41
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return (value & pos) != 0;43
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}45
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/**48
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* sets the specified bit to a value50
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* @param value the value to check52
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* @param bit the bit number54
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* @return if this bit is on56
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*/58
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public static boolean getBit(short value, int bit) {60
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if (bit < 0 || bit >= 16)62
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throw new IllegalArgumentException("invalid bit position");64
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short pos = (short) (1 << bit);66
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return (value & pos) != 0;68
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}70
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/**73
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* sets the specified bit to a value75
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* @param value the value to check77
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* @param bit the bit number79
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* @return if this bit is on81
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*/83
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public static boolean getBit(int value, int bit) {85
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if (bit < 0 || bit >= 32)87
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throw new IllegalArgumentException("invalid bit position");89
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int pos = 1 << bit;91
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return (value & pos) != 0;93
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}95
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/**98
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* sets the specified bit to a value100
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* @param value the value to check102
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