Most of the Assignment Completed

IntListReview.iml

@@ -7,5 +7,95 @@
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   </component>
 </module>

src/ArrayList.java

@@ -0,0 +1,253 @@
+import java.util.Iterator;
+
+public class ArrayList implements IntList{
+
+    private int size;
+
+    private int[] buffer;
+
+    public ArrayList(){
+        size = 0;
+        buffer = new int[10];
+    }
+    /**
+     * Prepends (inserts) the specified value at the front of the list (at index 0).
+     * Shifts the value currently at the front of the list (if any) and any
+     * subsequent values to the right.
+     *
+     * @param value value to be inserted
+     */
+    @Override
+    public void addFront(int value) {
+        for (int i = size - 1; i>=0; i--){ // shift elements
+        buffer[i+1] = buffer[i];
+           }
+        buffer[0] = value;
+        size++;
+        }
+
+    /**
+     * Appends (inserts) the specified value at the back of the list (at index size()-1).
+     *
+     * @param value value to be inserted
+     */
+    @Override
+    public void addBack(int value) {
+        if (size == buffer.length) {
+            resize(size * 2);
+        }
+        buffer[size] = value;
+        size++;
+    }
+
+    /**
+     * Inserts the specified value at the specified position in this list.
+     * Shifts the value currently at that position (if any) and any subsequent
+     * values to the right.
+     *
+     * @param index index at which the specified value is to be inserted
+     * @param value value to be inserted
+     * @throws IndexOutOfBoundsException if the index is out of range
+     */
+    @Override
+    public void add(int index, int value) {
+        if (index < 0 || index > size) {
+            throw new IndexOutOfBoundsException("index not in range"); // throw exception. get used to this!!
+        }
+        if (size == buffer.length) { //double array size to assure space for new element
+            resize(size * 2);
+        }
+        for (int i = size - 1; i >= 0; i--) { // shift elements to the right
+            buffer[i + 1] = buffer[i];
+        }
+        buffer[index] = value; //insert the new value at the given index
+        size++;
+    }
+
+    /**
+     * Removes the value located at the front of the list
+     * (at index 0), if it is present.
+     * Shifts any subsequent values to the left.
+     */
+    @Override
+    public void removeFront() {
+        if (size > 0){
+            for (int i = 0; i <= size - 2; i++) {
+                buffer[i] = buffer[i + 1];
+            }
+            size--;
+            }
+        }
+
+    /**
+     * Removes the value located at the back of the list
+     * (at index size()-1), if it is present.
+     */
+    @Override
+    public void removeBack() {
+        if (isEmpty()) {
+            throw new IndexOutOfBoundsException("Cannot remove from an empty list");
+        }else{
+            buffer[size - 1] = 0;
+            size--;
+        }
+    }
+
+    /**
+     * Removes the value at the specified position in this list.
+     * Shifts any subsequent values to the left. Returns the value
+     * that was removed from the list.
+     *
+     * @param index the index of the value to be removed
+     * @return the value previously at the specified position
+     * @throws IndexOutOfBoundsException if the index is out of range
+     */
+    @Override
+    public int remove(int index) {
+        if (index < 0 || index >= size) { //or do an if else instead of on "or" so I can be more specific with my error messages
+            throw new IndexOutOfBoundsException("number not in array");
+        }
+        int numberRemoved = buffer[index];
+        // Shift elements to the left (taken from remove front)
+        for (int i = index; i < size - 1; i++) {
+            buffer[i] = buffer[i + 1];
+        }
+        buffer[size -1] = 0;
+        size--;
+        return numberRemoved; //return the number removed from the position
+    }
+
+
+    /**
+     * Returns the value at the specified position in the list.
+     *
+     * @param index index of the value to return
+     * @return the value at the specified position in this list
+     * @throws IndexOutOfBoundsException if the index is out of range
+     */
+    @Override
+    public int get(int index) {
+        if (index < 0 || index >= size) {
+            throw new IndexOutOfBoundsException("number not in array");
+        }
+
+        return buffer[index];  // return given #
+    }
+
+    /**
+     * Returns true if this list contains the specified value.
+     *
+     * @param value value whose presence in this list is to be searched for
+     * @return true if this list contains the specified value
+     */
+    @Override
+    public boolean contains(int value) {
+        for (int i = 0; i < size; i++) {
+            if (buffer[i] == value) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns the index of the first occurrence of the specified value
+     * in this list, or -1 if this list does not contain the value.
+     *
+     * @param value value to search for
+     * @return the index of the first occurrence of the specified value in this list
+     * or -1 if this list does not contain the value
+     */
+    @Override
+    public int indexOf(int value) {
+        for (int i = 0; i < size; i++) {
+            if (buffer[i] == value) {
+                return i; // Value found, return its index
+            }
+        }
+        return -1; // Value not found in the list
+    }
+
+    /**
+     * Returns true if this list contains no values.
+     *
+     * @return true if this list contains no values
+     */
+    @Override
+    public boolean isEmpty() {
+        return false;
+    }
+
+    /**
+     * Returns the number of values in this list.
+     *
+     * @return the number of values in this list
+     */
+    @Override
+    public int size() {
+        return size;
+    }
+
+    /**
+     * Removes all the values from this list.
+     * The list will be empty after this call returns.
+     */
+    @Override
+    public void clear() {
+        buffer = new int[10];
+        size = 0;
+    }
+
+    /**
+     * Returns an iterator over elements of type {@code T}.
+     *
+     * @return an Iterator.
+     */
+    @Override
+    public Iterator<Integer> iterator() {
+        return null;
+    }
+    //create a private helper iterator class
+    private class IntListIterator implements Iterator<Integer>{
+        private int i;
+        private IntListIterator(){
+            i = 0;
+        }
+        /**
+         * Returns {@code true} if the iteration has more elements.
+         * (In other words, returns {@code true} if {@link #next} would
+         * return an element rather than throwing an exception.)
+         *
+         * @return {@code true} if the iteration has more elements
+         */
+        @Override
+        public boolean hasNext() {
+            return i < size;
+        }
+
+        /**
+         * Returns the next element in the iteration.
+         *
+         * @return the next element in the iteration
+         * @throws @NoSuchElementException if the iteration has no more elements
+         */
+        @Override
+        public Integer next() {
+            int currentValue = buffer[i];
+            i++;
+            return null;
+        }
+    }
+    //iterators enables main/client to use a for-each loop
+    // on my intlist
+
+    @Override
+    public void resize(int newSize){
+        int[] newBuffer = new int[newSize]; //create a new array that will be larger
+        for (int i = 0; i < buffer.length; i++){
+            newBuffer[i] = buffer[i];
+        }
+        buffer = newBuffer;
+        // this overwrites the previous array with our new larger array
+    }
+}