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BAEL-3911 (#8939)

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* Initial version of the code.

* Addressed PR comment.
This commit is contained in:
Karsten Silz 2020-03-23 18:17:16 +00:00 committed by GitHub
parent 8cfb3a1db8
commit 1062b4fef6
2 changed files with 87 additions and 0 deletions
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35
core-java-modules/core-java-date-operations-2/src/main/java/com/baeldung/datetime/dayofweek/DayOfWeekExtractor.java Normal file
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package com.baeldung.datetime.dayofweek;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.format.TextStyle;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
public class DayOfWeekExtractor {
public static int getDayNumberOld(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
return cal.get(Calendar.DAY_OF_WEEK);
}
public static String getDayStringOld(Date date, Locale locale ) {
DateFormat formatter = new SimpleDateFormat("EEEE", locale);
return formatter.format(date);
}
public static int getDayNumberNew(LocalDate date) {
DayOfWeek day = date.getDayOfWeek();
return day.getValue();
}
public static String getDayStringNew(LocalDate date, Locale locale ) {
DayOfWeek day = date.getDayOfWeek();
return day.getDisplayName(TextStyle.FULL, locale);
}
}

52
core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/datetime/dayofweek/DayOfWeekExtractorUnitTest.java Normal file
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package com.baeldung.datetime.dayofweek;
import static org.assertj.core.api.Assertions.assertThat;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.util.Calendar;
import java.util.Locale;
import org.junit.Test;
public class DayOfWeekExtractorUnitTest {
private DateFormat oldDateParser = new SimpleDateFormat("yyyy-MM-dd");
@Test
public void givenFeb29_2020_thenOldSaturdayNumber() throws ParseException {
assertThat(DayOfWeekExtractor.getDayNumberOld(oldDateParser.parse("2020-02-29")) == Calendar.SATURDAY);
}
@Test
public void givenFeb29_2020_and_localeUS_thenOldSaturdayText() throws ParseException {
assertThat("Saturday".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.US)) );
}
@Test
public void givenFeb29_2020_and_localeDE_thenOldSaturdayText() throws ParseException {
assertThat("Samstag".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.GERMANY)) );
}
@Test
public void givenFeb29_2020_thenNewSaturdayNumber() throws ParseException {
assertThat(DayOfWeekExtractor.getDayNumberNew(LocalDate.parse("2020-02-29")) == Calendar.SATURDAY);
}
@Test
public void givenFeb29_2020_and_localeUS_thenNewSaturdayText() throws ParseException {
assertThat("Saturday".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.US)) );
}
@Test
public void givenFeb29_2020_and_localeDE_thenNewSaturdayText() throws ParseException {
assertThat("Samstag".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.GERMANY)) );
}
}