BAEL-994 - TemporalAdjuster in Java (#2227)

* Evaluation article: Different Types of Bean Injection in Spring

* added tests & changed configuration to Java-based config

* removed xml config files

* rename unit tests

* BAEL-972 - Apache Commons Text

* remove code from evaluation article

* remove code from evaluation article

* BAEL-972 - Apache Commons Text - added another example

* BAEL-972 - Apache Commons Text - just indentation

* BAEL-994 - TemporalAdjuster in Java

core-java/src/test/java/com/baeldung/temporaladjusters/CustomTemporalAdjusterTest.java

@@ -0,0 +1,63 @@
+package com.baeldung.temporaladjusters;
+
+import java.text.SimpleDateFormat;
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.Period;
+import java.time.temporal.TemporalAdjuster;
+import java.time.temporal.TemporalAdjusters;
+import java.util.Calendar;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.baeldung.temporaladjuster.CustomTemporalAdjuster;
+import com.baeldung.temporaladjuster.TemporalAdjusterUtil;
+
+public class CustomTemporalAdjusterTest {
+
+    @Test
+    public void whenAdjustAndImplementInterface_thenNextWorkingDay() {
+        LocalDate localDate = LocalDate.now();
+        CustomTemporalAdjuster temporalAdjuster = new CustomTemporalAdjuster();
+        LocalDate nextWorkingDay = localDate.with(temporalAdjuster);
+
+        Assert.assertEquals(TemporalAdjusterUtil.getNextWorkingDay(), nextWorkingDay.toString());
+    }
+    
+    @Test
+    public void whenAdjust_thenNextWorkingDay() {
+        LocalDate localDate = LocalDate.now();
+        TemporalAdjuster temporalAdjuster = NEXT_WORKING_DAY;
+        LocalDate date = localDate.with(temporalAdjuster);
+
+        Assert.assertEquals(TemporalAdjusterUtil.getNextWorkingDay(), date.toString());
+    }
+
+    @Test
+    public void whenAdjust_thenFourteenDaysFromToday() {
+        LocalDate localDate = LocalDate.now();
+        TemporalAdjuster temporalAdjuster = (t) -> t.plus(Period.ofDays(14));
+        LocalDate result = localDate.with(temporalAdjuster);
+
+        Calendar calendar = Calendar.getInstance();
+        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
+        format.setCalendar(calendar);
+        calendar.add(Calendar.DATE, 14);
+        String fourteenDaysFromToday = format.format(calendar.getTime());
+
+        Assert.assertEquals(fourteenDaysFromToday, result.toString());
+    }
+
+    static TemporalAdjuster NEXT_WORKING_DAY = TemporalAdjusters.ofDateAdjuster(today -> {
+        DayOfWeek dayOfWeek = today.getDayOfWeek();
+        int daysToAdd;
+        if (dayOfWeek == DayOfWeek.FRIDAY)
+            daysToAdd = 3;
+        else if (dayOfWeek == DayOfWeek.SATURDAY)
+            daysToAdd = 2;
+        else
+            daysToAdd = 1;
+        return today.plusDays(daysToAdd);
+    });
+}

core-java/src/test/java/com/baeldung/temporaladjusters/TemporalAdjustersTest.java

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+package com.baeldung.temporaladjusters;
+
+import java.text.SimpleDateFormat;
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.temporal.TemporalAdjusters;
+import java.util.Calendar;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.baeldung.temporaladjuster.TemporalAdjusterUtil;
+
+public class TemporalAdjustersTest {
+
+    @Test
+    public void whenAdjust_thenNextSunday() {
+        LocalDate localDate = LocalDate.now();
+        LocalDate nextSunday = localDate.with(TemporalAdjusters.next(DayOfWeek.SUNDAY));
+
+        Calendar calendar = TemporalAdjusterUtil.nextDayOfWeek(Calendar.SUNDAY);
+        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
+        format.setCalendar(calendar);
+        String formattedDate = format.format(calendar.getTime());
+
+        Assert.assertEquals(formattedDate, nextSunday.toString());
+    }
+
+}