Java tutorial
/** * Copyright (c) 2012-2014 http://www.eryansky.com * * Licensed under the Apache License, Version 2.0 (the "License"); */ package com.eryansky.common.utils; import org.apache.commons.lang3.time.DateFormatUtils; import java.util.Arrays; import java.util.Date; /** * * @author &Eryan eryanwcp@gmail.com * @version 2016-05-03 */ public class TimeUtils { public static String toTimeString(long time) { TimeUtils t = new TimeUtils(time); int day = t.get(TimeUtils.DAY); int hour = t.get(TimeUtils.HOUR); int minute = t.get(TimeUtils.MINUTE); int second = t.get(TimeUtils.SECOND); StringBuilder sb = new StringBuilder(); if (day > 0) { sb.append(day).append(""); } if (hour > 0) { sb.append(hour).append(""); } if (minute > 0) { sb.append(minute).append(""); } if (second > 0) { sb.append(second).append(""); } return sb.toString(); } /** * ?? */ public final static int SECOND = 0; /** * ?? */ public final static int MINUTE = 1; /** * ?? */ public final static int HOUR = 2; /** * ?? */ public final static int DAY = 3; /** * ??? */ private final int[] maxFields = { 59, 59, 23, Integer.MAX_VALUE - 1 }; /** * ???? */ private final int[] minFields = { 0, 0, 0, Integer.MIN_VALUE }; /** * ? */ private String timeSeparator = ":"; /** * ? */ private int[] fields = new int[4]; /** * ?? 0 */ public TimeUtils() { this(0, 0, 0, 0); } /** * ? * @param hour ? * @param minute */ public TimeUtils(int hour, int minute) { this(0, hour, minute, 0); } /** * ?? * @param hour ? * @param minute * @param second */ public TimeUtils(int hour, int minute, int second) { this(0, hour, minute, second); } /** * <br/> * Time time = new Time("14:22:23"); * @param time ?:? */ public TimeUtils(String time) { this(time, null); // System.out.println(time); } /** * * @param time */ public TimeUtils(long time) { this(new Date(time)); } /** * * @param date */ public TimeUtils(Date date) { this(DateFormatUtils.formatUTC(date, "HH:mm:ss")); } /** * ??? * @param day * @param hour * @param minute * @param second */ public TimeUtils(int day, int hour, int minute, int second) { initialize(day, hour, minute, second); } /** * <br/> * Time time = new Time("14-22-23", "-"); * @param time ? */ public TimeUtils(String time, String timeSeparator) { if (timeSeparator != null) { setTimeSeparator(timeSeparator); } parseTime(time); } /** * * @param field ? * @param value */ public void set(int field, int value) { if (value < minFields[field]) { throw new IllegalArgumentException(value + ", time value must be positive."); } fields[field] = value % (maxFields[field] + 1); // ? int carry = value / (maxFields[field] + 1); if (carry > 0) { int upFieldValue = get(field + 1); set(field + 1, upFieldValue + carry); } } /** * * @param field ? * @return */ public int get(int field) { if (field < 0 || field > fields.length - 1) { throw new IllegalArgumentException(field + ", field value is error."); } return fields[field]; } /** * ??? * @param time ? * @return ?? */ public TimeUtils addTime(TimeUtils time) { TimeUtils result = new TimeUtils(); int up = 0; // ? for (int i = 0; i < fields.length; i++) { int sum = fields[i] + time.fields[i] + up; up = sum / (maxFields[i] + 1); result.fields[i] = sum % (maxFields[i] + 1); } return result; } /** * ????? * @param time ?? * @return ?? */ public TimeUtils subtractTime(TimeUtils time) { TimeUtils result = new TimeUtils(); int down = 0; // ? for (int i = 0, k = fields.length - 1; i < k; i++) { int difference = fields[i] + down; if (difference >= time.fields[i]) { difference -= time.fields[i]; down = 0; } else { difference += maxFields[i] + 1 - time.fields[i]; down = -1; } result.fields[i] = difference; } result.fields[DAY] = fields[DAY] - time.fields[DAY] + down; return result; } /** * * @return */ public String getTimeSeparator() { return timeSeparator; } /** * ? * @param timeSeparator */ public void setTimeSeparator(String timeSeparator) { this.timeSeparator = timeSeparator; } private void initialize(int day, int hour, int minute, int second) { set(DAY, day); set(HOUR, hour); set(MINUTE, minute); set(SECOND, second); } private void parseTime(String time) { if (time == null) { initialize(0, 0, 0, 0); return; } String t = time; int field = DAY; set(field--, 0); int p = -1; while ((p = t.indexOf(timeSeparator)) > -1) { parseTimeField(time, t.substring(0, p), field--); t = t.substring(p + timeSeparator.length()); } parseTimeField(time, t, field--); } private void parseTimeField(String time, String t, int field) { if (field < SECOND || t.length() < 1) { parseTimeException(time); } char[] chs = t.toCharArray(); int n = 0; for (int i = 0; i < chs.length; i++) { if (chs[i] <= ' ') { continue; } if (chs[i] >= '0' && chs[i] <= '9') { n = n * 10 + chs[i] - '0'; continue; } parseTimeException(time); } set(field, n); } private void parseTimeException(String time) { throw new IllegalArgumentException( time + ", time format error, HH" + this.timeSeparator + "mm" + this.timeSeparator + "ss"); } public String toString() { StringBuilder sb = new StringBuilder(16); sb.append(fields[DAY]).append(',').append(' '); buildString(sb, HOUR).append(timeSeparator); buildString(sb, MINUTE).append(timeSeparator); buildString(sb, SECOND); return sb.toString(); } private StringBuilder buildString(StringBuilder sb, int field) { if (fields[field] < 10) { sb.append('0'); } return sb.append(fields[field]); } public int hashCode() { final int PRIME = 31; int result = 1; result = PRIME * result + Arrays.hashCode(fields); return result; } public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; final TimeUtils other = (TimeUtils) obj; if (!Arrays.equals(fields, other.fields)) { return false; } return true; } }