BAEL-4751: Java 14 New Features (#10319)

* BAEL-4751: Java 14 New Features

* BAEL-4751: Code formatting

* BAEL-4751: Consistent excpetion message

* BAEL-4751: Changed assert

core-java-modules/core-java-14/src/test/java/com/baeldung/java14/newfeatues/MultilineUnitTest.java

@@ -0,0 +1,26 @@
+package com.baeldung.java14.newfeatues;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class MultilineUnitTest {
+    
+    @SuppressWarnings("preview")
+    String multiline = """ 
+            A quick brown fox jumps over a lazy dog; \
+         the lazy dog howls loudly.""";
+    
+    @SuppressWarnings("preview")
+    String anotherMultiline = """ 
+            A quick brown fox jumps over a lazy dog; 
+         the lazy dog howls loudly.""";
+    
+    @Test
+    public void givenMultilineString_whenSlashUsed_thenNoNewLine() {
+        assertFalse(multiline.contains("\n"));
+        assertTrue(anotherMultiline.contains("\n"));
+    }
+
+}

core-java-modules/core-java-14/src/test/java/com/baeldung/java14/newfeatues/RecordUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.java14.newfeatues;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class RecordUnitTest {
+
+    @SuppressWarnings("preview") 
+    public record User(int id, String password) {
+    };
+
+    private User user1 = new User(0, "UserOne");
+
+    @Test
+    public void givenRecord_whenObjInitialized_thenValuesCanBeFetchedWithGetters() {
+
+        assertEquals(0, user1.id());
+        assertEquals("UserOne", user1.password());
+    }
+
+    @Test
+    public void whenRecord_thenEqualsImplemented() {
+
+        User user2 = user1;
+
+        assertEquals(user1, user2);
+    }
+
+    @Test
+    public void whenRecord_thenToStringImplemented() {
+
+        assertTrue(user1.toString()
+            .contains("UserOne"));
+    }
+
+}

core-java-modules/core-java-14/src/test/java/com/baeldung/java14/newfeatues/SwitchExprUnitTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.java14.newfeatues;
+
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class SwitchExprUnitTest {
+
+    @Test
+    public void givenDay_whenSunday_thenWeekend() {
+        assertTrue(isTodayHolidayInJava8("SUNDAY"));
+
+        assertTrue(isTodayHolidayInJava14("SUNDAY"));
+
+        assertThatExceptionOfType(IllegalArgumentException.class).isThrownBy(() -> isTodayHolidayInJava8("SOMEDAY"));
+
+        assertThatExceptionOfType(IllegalArgumentException.class).isThrownBy(() -> isTodayHolidayInJava14("SOMEDAY"));
+    }
+
+    private boolean isTodayHolidayInJava8(String day) {
+
+        boolean isTodayHoliday;
+        switch (day) {
+            case "MONDAY":
+            case "TUESDAY":
+            case "WEDNESDAY":
+            case "THURSDAY":
+            case "FRIDAY":
+                isTodayHoliday = false;
+                break;
+            case "SATURDAY":
+            case "SUNDAY":
+                isTodayHoliday = true;
+                break;
+            default:
+                throw new IllegalArgumentException("What's a " + day);
+        }
+        return isTodayHoliday;
+    }
+
+    private boolean isTodayHolidayInJava14(String day) {
+        return switch (day) {
+            case "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY" -> false;
+            case "SATURDAY", "SUNDAY" -> true;
+            default -> throw new IllegalArgumentException("What's a " + day);
+        };
+    }
+
+}