Relised list

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

@@ -1,48 +1,98 @@
 package core.basesyntax;
 
+import java.util.NoSuchElementException;
+import java.util.Objects;
+
 public class ArrayList<T> implements List<T> {
+    private int size = 0;
+    private Object[] array = new Object[10];
+
     @Override
     public void add(T value) {
-
+        if (size == array.length) {
+            Object[] newArray = new Object[array.length + array.length / 2];
+            System.arraycopy(array, 0, newArray, 0, array.length);
+            array = newArray;
+        }
+        array[size] = value;
+        size++;
     }
 
     @Override
-    public void add(T value, int index) {
-
+    public void add(T value, int index) throws ArrayListIndexOutOfBoundsException {
+        if (index > size() || index < 0) {
+            throw new ArrayListIndexOutOfBoundsException("Index out of bounds");
+        }
+        if (size == array.length) {
+            Object[] newArray = new Object[array.length + array.length / 2];
+            System.arraycopy(array, 0, newArray, 0, array.length);
+            array = newArray;
+        }
+        System.arraycopy(array, index, array, index + 1, size() - index);
+        array[index] = value;
+        size++;
     }
 
     @Override
     public void addAll(List<T> list) {
-
+        int summarySize = list.size() + size();
+        final int tempSize = summarySize;
+        if (summarySize > array.length) {
+            summarySize = summarySize + summarySize / 2;
+            Object[] newArray = new Object[summarySize];
+            System.arraycopy(array, 0, newArray, 0, array.length);
+            array = newArray;
+        }
+        for (int i = 0; i < list.size(); i++) {
+            array[i + size] = list.get(i);
+        }
+        size = tempSize;
     }
 
     @Override
-    public T get(int index) {
-        return null;
+    public T get(int index) throws ArrayListIndexOutOfBoundsException {
+        if (index >= size() || index < 0) {
+            throw new ArrayListIndexOutOfBoundsException("Index out of bounds");
+        }
+        return (T) array[index];
     }
 
     @Override
-    public void set(T value, int index) {
-
+    public void set(T value, int index) throws ArrayListIndexOutOfBoundsException {
+        if (index >= size() || index < 0) {
+            throw new ArrayListIndexOutOfBoundsException("Index out of bounds");
+        }
+        array[index] = value;
     }
 
     @Override
     public T remove(int index) {
-        return null;
+        if (index >= size() || index < 0) {
+            throw new ArrayListIndexOutOfBoundsException("Index out of bounds");
+        }
+        T result = (T) array[index];
+        System.arraycopy(array, index + 1, array, index, array.length - index - 1);
+        size--;
+        return result;
     }
 
     @Override
-    public T remove(T element) {
-        return null;
+    public T remove(T element) throws NoSuchElementException {
+        for (int i = 0; i < size(); i++) {
+            if (Objects.equals(get(i), element)) {
+                return remove(i);
+            }
+        }
+        throw new NoSuchElementException();
     }
 
     @Override
     public int size() {
-        return 0;
+        return size;
     }
 
     @Override
     public boolean isEmpty() {
-        return false;
+        return size() == 0;
     }
 }