Implemented methods for ArrayList class

src/main/java/core/basesyntax/ArrayList.java

@@ -1,48 +1,130 @@
 package core.basesyntax;
 
+import java.util.NoSuchElementException;
+
 public class ArrayList<T> implements List<T> {
+    private static final int DEFAULT_ARRAY_CAPACITY = 10;
+    private Object[] elementData = new Object[DEFAULT_ARRAY_CAPACITY];
+    private int size;
+
     @Override
     public void add(T value) {
-
+        elementData = checkCapacity(elementData);
+        elementData[size()] = value;
+        size++;
     }
 
     @Override
     public void add(T value, int index) {
-
+        if (index > size() || index < 0) {
+            throw new ArrayListIndexOutOfBoundsException("This index doesn't exist");
+        }
+        elementData = checkCapacity(elementData);
+        System.arraycopy(elementData, index, elementData, index + 1, size() - index);
+        elementData[index] = value;
+        size++;
     }
 
     @Override
     public void addAll(List<T> list) {
-
+        if (list.size() == 0) {
+            return;
+        }
+        Object[] arrayFromCollection = getArrayFromCollection(list);
+        int capacity = list.size() + size();
+        Object[] summaryArray = new Object[capacity];
+        System.arraycopy(elementData, 0, summaryArray, 0, size());
+        System.arraycopy(arrayFromCollection, 0, summaryArray, size(), list.size());
+        elementData = checkCapacity(summaryArray);
+        size += list.size();
     }
 
     @Override
     public T get(int index) {
-        return null;
+        boolean rightIndex = validateIndex(index);
+        if (rightIndex == true) {
+            return (T) elementData[index];
+        } else {
+            throw new ArrayListIndexOutOfBoundsException("This index doesn't exist");
+        }
     }
 
     @Override
     public void set(T value, int index) {
-
+        boolean rightIndex = validateIndex(index);
+        if (rightIndex == true) {
+            elementData[index] = value;
+        } else {
+            throw new ArrayListIndexOutOfBoundsException("This index doesn't exist");
+        }
     }
 
     @Override
     public T remove(int index) {
-        return null;
+        T deletedElement;
+        boolean rigthIndex = validateIndex(index);
+        if (rigthIndex == true) {
+            deletedElement = (T) elementData[index];
+            System.arraycopy(elementData, index + 1, elementData, index, size() - index - 1);
+            elementData[size - 1] = null;
+            size--;
+            return deletedElement;
+        }
+        throw new ArrayListIndexOutOfBoundsException("This index doesn't exist");
     }
 
     @Override
     public T remove(T element) {
-        return null;
+        for (int i = 0; i < size(); i++) {
+            if ((element == null && elementData[i] == null)
+                    || element != null && element.equals(elementData[i])) {
+                return remove(i);
+            }
+        }
+        throw new NoSuchElementException("There is no element founded in this List");
     }
 
     @Override
     public int size() {
-        return 0;
+        return size;
     }
 
     @Override
     public boolean isEmpty() {
+        if (size() == 0) {
+            return true;
+        }
         return false;
     }
+
+    public Object[] checkCapacity(Object[] elementData) {
+        if (size() >= elementData.length) {
+            elementData = getNewCapacityArray(elementData);
+            return elementData;
+        }
+        return elementData;
+    }
+
+    public boolean validateIndex(int index) {
+        if (index < size() && index >= 0) /*&& elementData[index] != null)*/ {
+            return true;
+        }
+        return false;
+    }
+
+    public Object[] getArrayFromCollection(List<T> list) {
+        Object[] arrayFromCollection = new Object[list.size()];
+        for (int i = 0; i < list.size(); i++) {
+            arrayFromCollection[i] = list.get(i);
+        }
+        return arrayFromCollection;
+    }
+
+    public Object[] getNewCapacityArray(Object[] elementData) {
+        int capacityArray = elementData.length;
+        capacityArray += (capacityArray >> 1);
+        Object[] newArray = new Object[capacityArray];
+        System.arraycopy(elementData, 0, newArray, 0, size());
+        return newArray;
+    }
 }