diff --git a/core-java/src/main/java/com/baeldung/gregorian/calendar/GregorianCalendarExample.java b/core-java/src/main/java/com/baeldung/gregorian/calendar/GregorianCalendarExample.java new file mode 100644 index 0000000000..d8018cefd5 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/gregorian/calendar/GregorianCalendarExample.java @@ -0,0 +1,69 @@ +package com.baeldung.gregorian.calendar; + +import java.time.format.DateTimeFormatter; +import java.util.Calendar; +import java.util.Collections; +import java.util.Date; +import java.util.GregorianCalendar; +import java.util.HashSet; +import java.util.Locale; +import java.util.Set; +import java.util.TimeZone; + +import javax.xml.datatype.DatatypeConfigurationException; +import javax.xml.datatype.DatatypeFactory; +import javax.xml.datatype.XMLGregorianCalendar; + +public class GregorianCalendarExample { + + + public Date setMonth(GregorianCalendar calendar, int amount) { + calendar.set(Calendar.MONTH, amount); + return calendar.getTime(); + } + + + public Date rollAdd(GregorianCalendar calendar, int amount) { + calendar.roll(GregorianCalendar.MONTH, amount); + return calendar.getTime(); + } + + public boolean isLeapYearExample(int year) { + GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); + return cal.isLeapYear(year); + } + + + + public Date subtractDays(GregorianCalendar calendar, int daysToSubtract) { + GregorianCalendar cal = calendar; + cal.add(Calendar.DATE, -daysToSubtract); + return cal.getTime(); + } + + public Date addDays(GregorianCalendar calendar, int daysToAdd) { + GregorianCalendar cal = calendar; + cal.add(Calendar.DATE, daysToAdd); + return cal.getTime(); + } + + public XMLGregorianCalendar toXMLGregorianCalendar(GregorianCalendar calendar) throws DatatypeConfigurationException { + DatatypeFactory datatypeFactory = DatatypeFactory.newInstance(); + return datatypeFactory.newXMLGregorianCalendar(calendar); + } + + public Date toDate(XMLGregorianCalendar calendar) { + return calendar.toGregorianCalendar() + .getTime(); + } + + public int compareDates(GregorianCalendar firstDate, GregorianCalendar secondDate) { + return firstDate.compareTo(secondDate); + } + + public String formatDate(GregorianCalendar calendar) { + return calendar.toZonedDateTime() + .format(DateTimeFormatter.ofPattern("d MMM uuuu")); + } + +} diff --git a/core-java/src/test/java/com/baeldung/gregorian/calendar/GregorianCalendarTester.java b/core-java/src/test/java/com/baeldung/gregorian/calendar/GregorianCalendarTester.java new file mode 100644 index 0000000000..a1d084cf9a --- /dev/null +++ b/core-java/src/test/java/com/baeldung/gregorian/calendar/GregorianCalendarTester.java @@ -0,0 +1,228 @@ +package com.baeldung.gregorian.calendar; + +import static org.junit.Assert.*; + +import java.time.format.DateTimeFormatter; +import java.util.Calendar; +import java.util.Date; +import java.util.GregorianCalendar; +import java.util.Locale; +import java.util.TimeZone; + +import javax.xml.datatype.DatatypeConfigurationException; +import javax.xml.datatype.DatatypeFactory; +import javax.xml.datatype.XMLGregorianCalendar; + +import org.junit.Test; + +import com.baeldung.gregorian.calendar.GregorianCalendarExample; + +public class GregorianCalendarTester { + + @Test + public void test_Calendar_Return_Type_Valid() { + Calendar calendar = Calendar.getInstance(); + assert ("gregory".equals(calendar.getCalendarType())); + } + + @Test + public void test_Calendar_Return_Type_InValid() { + Calendar calendar = Calendar.getInstance(); + assertNotEquals("gregorys", calendar.getCalendarType()); + } + + @Test(expected = ClassCastException.class) + public void test_Class_Cast_Exception() { + TimeZone tz = TimeZone.getTimeZone("GMT+9:00"); + Locale loc = new Locale("ja", "JP", "JP"); + Calendar calendar = Calendar.getInstance(loc); + GregorianCalendar gc = (GregorianCalendar) calendar; + } + + @Test + public void test_Getting_Calendar_information() { + GregorianCalendar calendar = new GregorianCalendar(2018, 5, 28); + assertTrue(false == calendar.isLeapYear(calendar.YEAR)); + assertTrue(52 == calendar.getWeeksInWeekYear()); + assertTrue(2018 == calendar.getWeekYear()); + assertTrue(30 == calendar.getActualMaximum(calendar.DAY_OF_MONTH)); + assertTrue(1 == calendar.getActualMinimum(calendar.DAY_OF_MONTH)); + assertTrue(1 == calendar.getGreatestMinimum(calendar.DAY_OF_MONTH)); + assertTrue(28 == calendar.getLeastMaximum(calendar.DAY_OF_MONTH)); + assertTrue(31 == calendar.getMaximum(calendar.DAY_OF_MONTH)); + assertTrue(1 == calendar.getMinimum(calendar.DAY_OF_MONTH)); + assertTrue(52 == calendar.getWeeksInWeekYear()); + } + + @Test + public void test_Compare_Date_FirstDate_Greater_SecondDate() { + GregorianCalendar firstDate = new GregorianCalendar(2018, 6, 28); + GregorianCalendar secondDate = new GregorianCalendar(2018, 5, 28); + assertTrue(1 == firstDate.compareTo(secondDate)); + } + + + @Test + public void test_Compare_Date_FirstDate_Smaller_SecondDate() { + GregorianCalendar firstDate = new GregorianCalendar(2018, 5, 28); + GregorianCalendar secondDate = new GregorianCalendar(2018, 6, 28); + assertTrue(-1 == firstDate.compareTo(secondDate)); + } + + @Test + public void test_Compare_Date_Both_Dates_Equal() { + GregorianCalendar firstDate = new GregorianCalendar(2018, 6, 28); + GregorianCalendar secondDate = new GregorianCalendar(2018, 6, 28); + assertTrue(0 == firstDate.compareTo(secondDate)); + } + + @Test + public void test_date_format() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + GregorianCalendar calendar = new GregorianCalendar(2018, 6, 28); + assertEquals("28 Jul 2018", calendarDemo.formatDate(calendar)); + } + + @Test + public void test_dateFormatdMMMuuuu() { + String expectedDate = new GregorianCalendar(2018, 6, 28).toZonedDateTime() + .format(DateTimeFormatter.ofPattern("d MMM uuuu")); + assertEquals("28 Jul 2018", expectedDate); + } + + @Test + public void test_addDays() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28); + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.add(Calendar.DATE, 1); + Date expectedDate = calendarExpected.getTime(); + assertEquals(expectedDate, calendarDemo.addDays(calendarActual, 1)); + } + + @Test + public void test_whenAddOneDay_thenMonthIsChanged() { + final int finalDay1 = 1; + final int finalMonthJul = 6; + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 5, 30); + calendarExpected.add(Calendar.DATE, 1); + System.out.println(calendarExpected.getTime()); + assertEquals(calendarExpected.get(Calendar.DATE), finalDay1); + assertEquals(calendarExpected.get(Calendar.MONTH), finalMonthJul); + } + + @Test + public void test_whenSubtractOneDay_thenMonthIsChanged() { + final int finalDay31 = 31; + final int finalMonthMay = 4; + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 5, 1); + calendarExpected.add(Calendar.DATE, -1); + assertEquals(calendarExpected.get(Calendar.DATE), finalDay31); + assertEquals(calendarExpected.get(Calendar.MONTH), finalMonthMay); + } + + @Test + public void test_subDays() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28); + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.add(Calendar.DATE, -1); + Date expectedDate = calendarExpected.getTime(); + assertEquals(expectedDate, calendarDemo.subtractDays(calendarActual, 1)); + } + + @Test + public void test_rollAdd() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28); + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.roll(Calendar.MONTH, 8); + Date expectedDate = calendarExpected.getTime(); + assertEquals(expectedDate, calendarDemo.rollAdd(calendarActual, 8)); + } + + @Test + public void test_whenRollUpOneMonth_thenYearIsUnchanged() { + final int rolledUpMonthJuly = 7, orginalYear2018 = 2018; + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.roll(Calendar.MONTH, 1); + assertEquals(calendarExpected.get(Calendar.MONTH), rolledUpMonthJuly); + assertEquals(calendarExpected.get(Calendar.YEAR), orginalYear2018); + } + + @Test + public void test_whenRollDownOneMonth_thenYearIsUnchanged() { + final int rolledDownMonthJune = 5, orginalYear2018 = 2018; + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.roll(Calendar.MONTH, -1); + assertEquals(calendarExpected.get(Calendar.MONTH), rolledDownMonthJune); + assertEquals(calendarExpected.get(Calendar.YEAR), orginalYear2018); + } + + @Test + public void test_rollSubtract() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28); + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.roll(Calendar.MONTH, -8); + Date expectedDate = calendarExpected.getTime(); + assertEquals(expectedDate, calendarDemo.rollAdd(calendarActual, -8)); + } + + @Test + public void test_setMonth() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28); + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.set(Calendar.MONTH, 3); + Date expectedDate = calendarExpected.getTime(); + assertEquals(expectedDate, calendarDemo.setMonth(calendarActual, 3)); + } + + @Test + public void test_setMonthApril() { + final int setMonthApril = 3, orginalYear2018 = 2018, originalDate28 = 28; + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + calendarExpected.set(Calendar.MONTH, 3); + assertEquals(calendarExpected.get(Calendar.MONTH), setMonthApril); + assertEquals(calendarExpected.get(Calendar.YEAR), orginalYear2018); + assertEquals(calendarExpected.get(Calendar.DATE), originalDate28); + } + + @Test + public void test_toXMLGregorianCalendar() throws DatatypeConfigurationException { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + DatatypeFactory datatypeFactory = DatatypeFactory.newInstance(); + GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28); + GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28); + XMLGregorianCalendar expectedXMLGregorianCalendar = datatypeFactory + .newXMLGregorianCalendar(calendarExpected); + assertEquals(expectedXMLGregorianCalendar, + calendarDemo.toXMLGregorianCalendar(calendarActual)); + } + + @Test + public void test_isLeapYear_True() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + assertEquals(true, calendarDemo.isLeapYearExample(2016)); + + } + + @Test + public void test_isLeapYear_False() { + GregorianCalendarExample calendarDemo = new GregorianCalendarExample(); + assertEquals(false, calendarDemo.isLeapYearExample(2018)); + + } + + @Test + public void test_toDate() throws DatatypeConfigurationException { + GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28); + DatatypeFactory datatypeFactory = DatatypeFactory.newInstance(); + XMLGregorianCalendar expectedXMLGregorianCalendar = datatypeFactory + .newXMLGregorianCalendar(calendarActual); + expectedXMLGregorianCalendar.toGregorianCalendar().getTime(); + assertEquals(calendarActual.getTime(), + expectedXMLGregorianCalendar.toGregorianCalendar().getTime() ); + } +}