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turingfly
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Dates, Strings and Localization
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‎Java-8/src/datesStringsLocalization/DatesAndTimes.java

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package datesStringsLocalization;
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import java.time.*;
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import java.time.temporal.ChronoUnit;
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/**
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*
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* @author chengfeili
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* Jun 9, 2017 2:24:48 PM
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*
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*/
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public class DatesAndTimes {
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public void create() {
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LocalDate date1 = LocalDate.of(2015, Month.JANUARY, 20);
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LocalDate date2 = LocalDate.of(2015, 1, 20);
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Month month = Month.JANUARY;
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// boolean b1 = month == 1; // DOES NOT COMPILE
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boolean b2 = month == Month.APRIL; // false
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LocalTime time1 = LocalTime.of(6, 15);
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LocalTime time2 = LocalTime.of(6, 15, 30);
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LocalTime time3 = LocalTime.of(6, 15, 30, 200);
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LocalDateTime dateTime1 = LocalDateTime.of(2015, Month.JANUARY, 20, 6, 15, 30);
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LocalDateTime dateTime2 = LocalDateTime.of(date1, time1);
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ZoneId zone = ZoneId.of("US/Eastern");
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ZonedDateTime zoned1 = ZonedDateTime.of(2015, 1, 20, 6, 15, 30, 200, zone);
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ZonedDateTime zoned2 = ZonedDateTime.of(date1, time1, zone);
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ZonedDateTime zoned3 = ZonedDateTime.of(dateTime1, zone);
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}
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public void manipulate() {
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// Date
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LocalDate date = LocalDate.of(2014, Month.JANUARY, 20);
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date = date.plusDays(2);
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date = date.plusWeeks(1);
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date = date.plusMonths(1);
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date = date.plusYears(5);
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// Date Time
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LocalDate date1 = LocalDate.of(2020, Month.JANUARY, 20);
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LocalTime time = LocalTime.of(5, 15);
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LocalDateTime dateTime = LocalDateTime.of(date1, time).minusDays(1).minusHours(10).minusSeconds(30);
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System.out.println(dateTime); // 2020-01-18T19:14:30
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}
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public void period() {
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Period annually = Period.ofYears(1);
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Period quarterly = Period.ofMonths(3);
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Period everyThreeWeeks = Period.ofWeeks(3);
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Period everyOtherDay = Period.ofDays(2);
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Period everyYearAndAWeek = Period.of(1, 0, 7);
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LocalDate date = LocalDate.of(2014, Month.JANUARY, 20);
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date = date.plus(annually);
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System.out.println(date);
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System.out.println(Period.of(0, 20, 47)); // P20M47D
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System.out.println(Period.of(2, 20, 47)); // P2Y20M47D
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}
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// For Duration, you can specify the number of days, hours, minutes,
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// seconds, or nanoseconds.
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public void duration() {
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Duration daily = Duration.of(1, ChronoUnit.DAYS);
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Duration hourly = Duration.of(1, ChronoUnit.HOURS);
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Duration everyMinute = Duration.of(1, ChronoUnit.MINUTES);
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Duration everyTenSeconds = Duration.of(10, ChronoUnit.SECONDS);
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Duration everyMilli = Duration.of(1, ChronoUnit.MILLIS);
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Duration everyNano = Duration.of(1, ChronoUnit.NANOS);
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LocalDate date = LocalDate.of(2015, 5, 25);
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Period period = Period.ofDays(1);
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Duration days = Duration.ofDays(1);
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System.out.println(date.plus(period)); // 2015–05–26
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// System.out.println(date.plus(days)); // Unsupported unit: Seconds
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}
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// The Instant class represents a specific moment in time in the GMT time
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// zone.
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public void instants() {
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Instant now = Instant.now(); // do something time consuming Instant
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Instant later = Instant.now();
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Duration duration = Duration.between(now, later);
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System.out.println(duration.toMillis());
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LocalDate date = LocalDate.of(2015, 5, 25);
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LocalTime time = LocalTime.of(11, 55, 00);
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ZoneId zone = ZoneId.of("US/Eastern");
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ZonedDateTime zonedDateTime = ZonedDateTime.of(date, time, zone);
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Instant instant = zonedDateTime.toInstant();
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Instant nextDay = instant.plus(1, ChronoUnit.DAYS);
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System.out.println(nextDay);
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Instant nextHour = instant.plus(1, ChronoUnit.HOURS);
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System.out.println(nextHour);
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// Instant nextWeek = instant.plus(1, ChronoUnit.WEEKS); // exception
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}
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public static void main(String[] args) {
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DatesAndTimes dt = new DatesAndTimes();
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dt.create();
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dt.manipulate();
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dt.period();
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dt.duration();
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dt.instants();
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}
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}

‎Java-8/src/datesStringsLocalization/FormattingDatesAndTimes.java

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package datesStringsLocalization;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.time.LocalTime;
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import java.time.Month;
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import java.time.format.DateTimeFormatter;
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import java.time.format.FormatStyle;
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/**
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*
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* @author chengfeili
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* Jun 9, 2017 3:57:38 PM
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*
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*/
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public class FormattingDatesAndTimes {
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public void test() {
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LocalDate date = LocalDate.of(2020, Month.JANUARY, 20);
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LocalTime time = LocalTime.of(11, 12, 34);
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LocalDateTime dateTime = LocalDateTime.of(date, time);
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System.out.println(date.format(DateTimeFormatter.ISO_LOCAL_DATE)); // 2020-01-20
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System.out.println(time.format(DateTimeFormatter.ISO_LOCAL_TIME)); // 11:12:34
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System.out.println(dateTime.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)); // 2020-01-20T11:12:34
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DateTimeFormatter shortDateTime = DateTimeFormatter.ofLocalizedDate(FormatStyle.SHORT);
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System.out.println(shortDateTime.format(dateTime)); // 1/20/20
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System.out.println(shortDateTime.format(date)); // 1/20/20
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// System.out.println(shortDateTime.format(time)); //
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// UnsupportedTemporalTypeException
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// short and medium
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DateTimeFormatter shortF = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT);
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DateTimeFormatter mediumF = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.MEDIUM);
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System.out.println(shortF.format(dateTime)); // 1/20/20 11:12 AM
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System.out.println(mediumF.format(dateTime)); // Jan 20, 2020 11:12:34AM
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// Customize your own formatter
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DateTimeFormatter f = DateTimeFormatter.ofPattern("MMMM dd, yyyy, hh:mm");
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System.out.println(dateTime.format(f)); // January 20, 2020, 11:12
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// String to Datetime
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DateTimeFormatter fm = DateTimeFormatter.ofPattern("MM dd yyyy");
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LocalDate date1 = LocalDate.parse("01 02 2015", fm);
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LocalTime time1 = LocalTime.parse("11:22");
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System.out.println(date1); // 2017–06–09
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System.out.println(time1); // 11:22
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}
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public static void main(String[] args) {
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FormattingDatesAndTimes fdt = new FormattingDatesAndTimes();
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fdt.test();
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}
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}

‎Java-8/src/datesStringsLocalization/FormattingNumbers.java

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package datesStringsLocalization;
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import java.text.NumberFormat;
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import java.text.ParseException;
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import java.util.Locale;
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/**
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*
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* @author chengfeili
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* Jun 9, 2017 3:49:38 PM
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*
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* Once you have the NumberFormat instance, you can call format() to
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* turn a number into a String and parse() to turn a String into a
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* number.
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*
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* The format classes are not thread-safe. Do not store them in instance
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* variables or static variables.
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*/
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public class FormattingNumbers {
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public void test() throws ParseException {
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int attendeesPerYear = 3_200_000;
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int attendeesPerMonth = attendeesPerYear / 12;
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NumberFormat us = NumberFormat.getInstance(Locale.US);
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System.out.println(us.format(attendeesPerMonth)); // 266,666
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NumberFormat g = NumberFormat.getInstance(Locale.GERMANY);
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System.out.println(g.format(attendeesPerMonth)); // 266.666
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NumberFormat ca = NumberFormat.getInstance(Locale.CANADA_FRENCH);
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System.out.println(ca.format(attendeesPerMonth)); // 266 666
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double price = 48;
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NumberFormat usa = NumberFormat.getCurrencyInstance();
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System.out.println(usa.format(price)); // $48.00
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NumberFormat en = NumberFormat.getInstance(Locale.US);
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NumberFormat fr = NumberFormat.getInstance(Locale.FRANCE);
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String s = "40.45";
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System.out.println(en.parse(s)); // 40.45
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System.out.println(fr.parse(s)); // 40
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NumberFormat nf = NumberFormat.getInstance();
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String one = "456abc";
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String two = "-2.5165x10";
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String three = "x85.3";
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System.out.println(nf.parse(one));
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System.out.println(nf.parse(two));
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// System.out.println(nf.parse(three)); // throws ParseException
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}
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public static void main(String[] args) throws ParseException {
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FormattingNumbers fm = new FormattingNumbers();
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fm.test();
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}
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}

‎Java-8/src/datesStringsLocalization/InternationalizationLocalization.java

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package datesStringsLocalization;
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import java.util.*;
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/**
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*
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* @author chengfeili
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* Jun 9, 2017 2:56:03 PM
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*
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* Internationalization is the process of designing your program so it
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* can be adapted.
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* Localization means actually supporting multiple locales.
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*/
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public class InternationalizationLocalization {
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public void locale() {
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Locale locale = Locale.getDefault();
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System.out.println(locale); // en_US
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Locale l1 = new Locale.Builder().setLanguage("en").setRegion("US").build();
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Locale l2 = new Locale.Builder().setRegion("US").setLanguage("en").build();
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}
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public static void main(String[] args) {
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InternationalizationLocalization ii = new InternationalizationLocalization();
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ii.locale();
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}
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}

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