BAEL-5280: added code for ArrayIndexOutOfBoundsException. (#11772)

* commited initial code for hexagonal architecture

* Deleting to check in again

* Deleing to check in again

* Push first code for Hexagonal Architecture

* final code with UT for JSON to Java conversion

* removed hexagonal-architecture code from last commit

* BEL-5071 updated README

* BAEL-5071: Undo README changes and added a nested object in the JSON example.

* BAEL-5071: fixed whitespace/indentation in JsonToJavaClassConversion.java

* BAEL-5151: Added code for getting the first of a String

* BAEL-5151: Renamed Unit Test

* BAEL-5151: Moved the files from core-java-string-operations to core-java-string-operations-3

* BAEL-5151: Replaced tabs with white spaces.

* BAEL-5228: Adding code for approaches to concatening null string in java

* BAEL-5228: Moved file to correct folder and added a UT.

* BAEL-5228: corrected import statements.

* BAEL-5228: corrected last commit.

* BAEL-5228: removed extra import.

* BAEL-5228: renamed UT

* BAEL-5280: added code for ArrayIndexOutOfBoundsException.

* BAEL-5280: moved code for ArrayIndexOutOfBoundsException in a new module.

* BAEL-5280: Fixed tab/spaces in pom.xml.

* BAEL-5280: Fixed indentation in ArrayIndexOutOfBoundsExceptionDemoUnitTest.java.

Co-authored-by: Vaibhav Jain <vaibhav.ashokjain@vodafone.com>

core-java-modules/core-java-exceptions-4/src/main/java/com/baeldung/exception/arrayindexoutofbounds/ArrayIndexOutOfBoundsExceptionDemo.java

@@ -0,0 +1,31 @@
+package com.baeldung.exception.arrayindexoutofbounds;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class ArrayIndexOutOfBoundsExceptionDemo {
+
+    public static void main(String[] args) {
+        int[] numbers = new int[] { 1, 2, 3, 4, 5 };
+        
+        getArrayElementAtIndex(numbers, 5);
+        getListElementAtIndex(5);
+        addArrayElementsUsingLoop(numbers);
+    }
+
+    public static void addArrayElementsUsingLoop(int[] numbers) {
+        int sum = 0;
+        for (int i = 0; i <= numbers.length; i++) {
+            sum += numbers[i];
+        }
+    }
+
+    public static int getListElementAtIndex(int index) {
+        List<Integer> numbersList = Arrays.asList(1, 2, 3, 4, 5);
+        return numbersList.get(index);
+    }
+
+    public static int getArrayElementAtIndex(int[] numbers, int index) {
+        return numbers[index];
+    }
+}

core-java-modules/core-java-exceptions-4/src/test/java/com/baeldung/exception/arrayindexoutofbounds/ArrayIndexOutOfBoundsExceptionDemoUnitTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.exception.arrayindexoutofbounds;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+public class ArrayIndexOutOfBoundsExceptionDemoUnitTest {
+
+    private static int[] numbers;
+
+    @BeforeAll
+    public static void setUp() {
+        numbers = new int[] { 1, 2, 3, 4, 5 };
+    }
+
+    @Test
+    void givenAnArrayOfSizeFive_whenAccessedElementBeyondRange_thenShouldThrowArrayIndexOutOfBoundsException() {
+        assertThrows(ArrayIndexOutOfBoundsException.class,
+          () -> ArrayIndexOutOfBoundsExceptionDemo.addArrayElementsUsingLoop(numbers));
+    }
+
+    @Test
+    void givenAnArrayOfSizeFive_whenAccessedAnElementAtIndexEqualToSize_thenShouldThrowArrayIndexOutOfBoundsException() {
+        assertThrows(ArrayIndexOutOfBoundsException.class,
+          () -> ArrayIndexOutOfBoundsExceptionDemo.getArrayElementAtIndex(numbers, 5));
+    }
+
+    @Test
+    void givenAListReturnedByArraysAsListMethod_whenAccessedAnElementAtIndexEqualToSize_thenShouldThrowArrayIndexOutOfBoundsException() {
+        assertThrows(ArrayIndexOutOfBoundsException.class,
+          () -> ArrayIndexOutOfBoundsExceptionDemo.getListElementAtIndex(5));
+    }
+}