package com.genersoft.iot.vmp.jt1078.util;
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/**
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* 32位整型的二进制读写
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*/
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public class Bin {
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private static final int[] bits = new int[32];
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static {
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bits[0] = 1;
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for (int i = 1; i < bits.length; i++) {
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bits[i] = bits[i - 1] << 1;
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}
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}
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/**
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* 读取n的第i位
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*
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* @param n int32
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* @param i 取值范围0-31
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*/
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public static boolean get(int n, int i) {
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return (n & bits[i]) == bits[i];
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}
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/**
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* 不足位数从左边加0
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*/
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public static String strHexPaddingLeft(String data, int length) {
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int dataLength = data.length();
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if (dataLength < length) {
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StringBuilder dataBuilder = new StringBuilder(data);
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for (int i = dataLength; i < length; i++) {
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dataBuilder.insert(0, "0");
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}
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data = dataBuilder.toString();
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}
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return data;
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}
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}
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