BAEL-4600 | Add examples to demonstrate the difference between Array … (

eugenp#10211)

* BAEL-4600 | Add examples to demonstrate the difference between Array Size vs ArrayList Capacity

* BAEL-4600 | Refactor | Remove ArrayCreator and ArrayListCreator

core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayCreatorUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.listcapacityvsarraysize;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class ArrayCreatorUnitTest {
+
+    @Test
+    void whenSizeOfAnArrayIsNonZero_thenReturnNewArrayOfGivenSize() {
+        Integer[] array = new Integer[10];
+        assertEquals(10, array.length);
+    }
+
+    @Test
+    void whenSizeOfAnArrayIsLessThanZero_thenThrowException() {
+        assertThrows(NegativeArraySizeException.class, () -> { Integer[] array = new Integer[-1]; });
+    }
+}

core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayListCreatorUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.listcapacityvsarraysize;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ArrayListCreatorUnitTest {
+
+    @Test
+    void givenValidCapacityOfList_whenCreateListInvoked_thenCreateNewArrayListWithGivenCapacity() {
+        ArrayList<Integer> list = new ArrayList<>(100);
+
+        assertNotNull(list);
+    }
+
+    @Test
+    void givenInvalidCapacityOfList_whenCreateListInvoked_thenThrowException() {
+        assertThrows(IllegalArgumentException.class, () -> new ArrayList<>(-1));
+    }
+
+    @Test
+    void givenValidCapacityOfList_whenCreateListInvoked_thenCreateNewArrayListWithSizeZero() {
+        assertEquals(0, new ArrayList<Integer>(100).size());
+    }
+}