Merge branch 'master' of https://github.com/eugenp/tutorials

core-java-modules/core-java-date-operations-2/src/main/java/com/baeldung/weeknumber/WeekNumberUsingCalendar.java

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+package com.baeldung.weeknumber;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.Locale;
+
+public class WeekNumberUsingCalendar {
+
+    public int getWeekNumberFrom(String day, String dateFormat, Locale locale) throws ParseException {
+        SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
+
+        Calendar calendar = Calendar.getInstance(locale);
+        Date date = sdf.parse(day);
+        calendar.setTime(date);
+
+        return calendar.get(Calendar.WEEK_OF_YEAR);
+    }
+
+    public int getWeekNumberFrom(int year, int month, int day, Locale locale) {
+        Calendar calendar = Calendar.getInstance(locale);
+        calendar.set(year, month, day);
+
+        return calendar.get(Calendar.WEEK_OF_YEAR);
+    }
+
+    public int getWeekNumberFrom(int year, int month, int day, int firstDayOfWeek, int minimalDaysInFirstWeek, Locale locale) {
+        Calendar calendar = Calendar.getInstance(locale);
+        calendar.setFirstDayOfWeek(firstDayOfWeek);
+        calendar.setMinimalDaysInFirstWeek(minimalDaysInFirstWeek);
+        calendar.set(year, month, day);
+
+        return calendar.get(Calendar.WEEK_OF_YEAR);
+    }
+
+    public static void main(String[] args) {
+        WeekNumberUsingCalendar calendar = new WeekNumberUsingCalendar();
+        System.out.println(calendar.getWeekNumberFrom(2020, 2, 22, Locale.CANADA));
+    }
+}

core-java-modules/core-java-date-operations-2/src/main/java/com/baeldung/weeknumber/WeekNumberUsingLocalDate.java

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+package com.baeldung.weeknumber;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.ChronoField;
+import java.time.temporal.WeekFields;
+import java.util.Locale;
+
+public class WeekNumberUsingLocalDate {
+
+    public Integer getWeekNumberUsingWeekFiedsFrom(String day, String dayFormat, Locale locale) {
+        LocalDate date = LocalDate.parse(day, DateTimeFormatter.ofPattern(dayFormat));
+
+        return date.get(WeekFields.of(locale)
+            .weekOfYear());
+    }
+
+    public Integer getWeekNumberUsinWeekFieldsFrom(int year, int month, int day, Locale locale) {
+        LocalDate date = LocalDate.of(year, month, day);
+
+        return date.get(WeekFields.of(locale)
+            .weekOfYear());
+    }
+
+    public Integer getWeekNumberUsingChronoFieldFrom(int year, int month, int day) {
+        LocalDate date = LocalDate.of(year, month, day);
+
+        return date.get(ChronoField.ALIGNED_WEEK_OF_YEAR);
+    }
+}

core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/weeknumber/WeekNumberUsingCalendarUnitTest.java

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+package com.baeldung.weeknumber;
+
+import static org.junit.Assert.assertEquals;
+
+import java.text.ParseException;
+import java.util.Calendar;
+import java.util.Locale;
+
+import org.junit.Test;
+
+public class WeekNumberUsingCalendarUnitTest {
+    @Test
+    public void givenDateInStringAndDateFormatUsingLocaleItaly_thenGettingWeekNumberUsingCalendarIsCorrectlyReturned() throws ParseException {
+        WeekNumberUsingCalendar calendar = new WeekNumberUsingCalendar();
+
+        assertEquals(12, calendar.getWeekNumberFrom("20200322", "yyyyMMdd", Locale.ITALY));
+    }
+
+    @Test
+    public void givenDateInStringAndDateFormatUsingLocaleCanada_thenGettingWeekNumberUsingCalendarIsCorrectlyReturned() throws ParseException {
+        WeekNumberUsingCalendar calendar = new WeekNumberUsingCalendar();
+
+        assertEquals(13, calendar.getWeekNumberFrom("20200322", "yyyyMMdd", Locale.CANADA));
+    }
+
+    @Test
+    public void givenDateInYearMonthDayNumbersLocaleItaly_thenGettingWeekNumberUsingCalendarIsCorrectlyReturned() {
+        WeekNumberUsingCalendar calendar = new WeekNumberUsingCalendar();
+
+        assertEquals(12, calendar.getWeekNumberFrom(2020, 2, 22, Locale.ITALY));
+    }
+
+    @Test
+    public void givenDateInYearMonthDayNumbersLocaleItalyChangingWeekCalculationSettings_thenGettingWeekNumberUsingCalendarIsCorrectlyReturned() {
+        WeekNumberUsingCalendar calendar = new WeekNumberUsingCalendar();
+
+        assertEquals(13, calendar.getWeekNumberFrom(2020, 2, 22, Calendar.SUNDAY, 4, Locale.ITALY));
+    }
+
+    @Test
+    public void givenDateInYearMonthDayNumbersLocaleCanada_thenGettingWeekNumberUsingCalendarIsCorrectlyReturned() {
+        WeekNumberUsingCalendar calendar = new WeekNumberUsingCalendar();
+
+        assertEquals(13, calendar.getWeekNumberFrom(2020, 2, 22, Locale.CANADA));
+    }
+}

core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/weeknumber/WeekNumberUsingLocalDateUnitTest.java

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+package com.baeldung.weeknumber;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Locale;
+
+import org.junit.Test;
+
+public class WeekNumberUsingLocalDateUnitTest {
+    @Test
+    public void givenDateInStringAndDateFormatUsingWeekFieldsWithLocaleItaly_thenGettingWeekNumberUsingLocalDateIsCorrectlyReturned() {
+        WeekNumberUsingLocalDate localDate = new WeekNumberUsingLocalDate();
+
+        assertEquals(12, localDate.getWeekNumberUsingWeekFiedsFrom("20200322", "yyyyMMdd", Locale.ITALY)
+            .longValue());
+    }
+
+    @Test
+    public void givenDateInStringAndDateFormatUsingWeekFieldsWithLocaleCanada_thenGettingWeekNumberUsingLocalDateIsCorrectlyReturned() {
+        WeekNumberUsingLocalDate localDate = new WeekNumberUsingLocalDate();
+
+        assertEquals(13, localDate.getWeekNumberUsingWeekFiedsFrom("20200322", "yyyyMMdd", Locale.CANADA)
+            .longValue());
+    }
+
+    @Test
+    public void givenDateInStringAndDateFormatUsingChronoFieds_thenGettingWeekNumberUsingLocalDateIsCorrectlyReturned() {
+        WeekNumberUsingLocalDate localDate = new WeekNumberUsingLocalDate();
+
+        assertEquals(12, localDate.getWeekNumberUsingChronoFieldFrom(2020, 3, 22)
+            .longValue());
+    }
+
+    @Test
+    public void givenDateInYearMonthDayNumbersUsingWeekFieldsWithLocaleItaly_thenGettingWeekNumberUsingLocalDateIsCorrectlyReturned() {
+        WeekNumberUsingLocalDate localDate = new WeekNumberUsingLocalDate();
+
+        assertEquals(12, localDate.getWeekNumberUsinWeekFieldsFrom(2020, 3, 22, Locale.ITALY)
+            .longValue());
+    }
+
+    @Test
+    public void givenDateInYearMonthDayNumbersUsingWeekFieldsWithLocaleCanada_thenGettingWeekNumberUsingLocalDateIsCorrectlyReturned() {
+        WeekNumberUsingLocalDate localDate = new WeekNumberUsingLocalDate();
+
+        assertEquals(13, localDate.getWeekNumberUsinWeekFieldsFrom(2020, 3, 22, Locale.CANADA)
+            .longValue());
+    }
+}