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/**
* @author duiliu
* 2019/3/18
*/
public class DateDemo {
// 测试
public static void main(final String[] args) {
final Date date = new Date(2019, 2, 12, 11, 03, 56);
final DateFomatter dateFomatter1 = new DateFomatter("yyyy\\u00ADMM\\u00ADddTHH:mm:ss");
System.out.println("1\t" +
dateFomatter1.format(date)
);
final DateFomatter dateFomatter2 = new DateFomatter("yy\\u00ADM\\u00ADd // H:m:s");
System.out.println("2\t" +
dateFomatter2.format(date)
);
final DateFomatter dateFomatter3 = new DateFomatter("d/m/yyyy");
System.out.println("3\t" +
dateFomatter3.format(date)
);
final DateFomatter dateFomatter4 = new DateFomatter("hh:mm:ss");
System.out.println("4\t" +
dateFomatter4.format(date)
);
final DateFomatter dateFomatter5 = new DateFomatter(
"yyyy\u00ADMM\u00ADdd,yy\u00ADM\u00ADd");
System.out.println("5\t" +
dateFomatter5.format(date)
);
final DateFomatter dateFomatter6 = new DateFomatter(
"hxmxs");
System.out.println("6\t" +
dateFomatter6.format(date)
);
}
}
// 题目给出的时间数据结构
class Date {
public int Year;
public int Month;
public int Day;
public int Hour;
public int Minute;
public int Second;
public Date(final int year, final int month, final int day, final int hour, final int minute,
final int second) {
Year = year;
Month = month;
Day = day;
Hour = hour;
Minute = minute;
Second = second;
}
}
// 时间格式化类
class DateFomatter {
private final String formatStr;
static final Exception InvalidException = new Exception("invalid format");
public DateFomatter(final String format) {
this.formatStr = format;
}
public String format(final Date date) {
char ch = ' ';
int i = 0, j = 1;
final StringBuilder sb = new StringBuilder();
try {
while (i++ < formatStr.length()) {
j = 1;
while (i < formatStr.length() && (ch = formatStr.charAt(i)) == formatStr.charAt(
i - 1)) {
i++;
j++;
}
sb.append(formatDate(formatStr.charAt(i - 1), j, date));
}
} catch (final Exception e) {
return e.getMessage();
}
return sb.toString();
}
private String formatDate(final char ch, final int length, final Date date) throws Exception {
switch (ch) {
case 'y':
return formatTwoOrFour(length, date.Year);
case 'M':
return formatOneOrTwo(length, date.Month);
case 'd':
return formatOneOrTwo(length, date.Day);
case 'H':
return formatOneOrTwo(length == 1 && date.Hour > 10 ? 2 : length, date.Hour);
case 'h':
return formatOneOrTwo(length == 1 && date.Hour > 10 ? 2 : length, date.Hour % 12);
case 'm':
return formatOneOrTwo(length == 1 && date.Minute > 10 ? 2 : length, date.Minute);
case 's':
return formatOneOrTwo(length == 1 && date.Second > 10 ? 2 : length, date.Second);
default:
return ch + "";
}
}
private String intToString(final int needLength, final int number) {
int length = 0;
int temp = number;
final StringBuilder sb = new StringBuilder();
while (temp > 0 && length++ < needLength) {
sb.append(temp % 10);
temp /= 10;
}
while (length++ < needLength) {
sb.append(0);
}
return sb.reverse().toString();
}
private String formatOne(final int number) {
return intToString(1, number);
}
private String formatTwo(final int number) {
return intToString(2, number);
}
private String formatFour(final int number) {
return intToString(4, number);
}
private String formatOneOrTwo(final int length, final int number) throws Exception {
if (length == 1) {
return formatOne(number);
} else if (length == 2) {
return formatTwo(number);
}
throw InvalidException;
}
private String formatTwoOrFour(final int length, final int number) throws Exception {
if (length == 2) {
return formatTwo(number);
} else if (length == 4) {
return formatFour(number);
}
throw InvalidException;
}
}
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