after lecture06

06/ICollection.java

+import java.util.Iterator;
+
+public interface ICollection<E> extends Iterable<E> {
+  public void add(E e);
+  public void clear();
+
+  public Iterator<E> iterator();
+
+  default public boolean contains(E e) {
+    for (E item : this) {
+      if (e == null ? item == null : e.equals(item)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  public int size();
+  default public boolean isEmpty() {
+    return this.size() == 0;
+  }
+}
\ No newline at end of file

06/LinkedList.java

+public class LinkedList<E> implements IList<E> {
+    private Node<E> head;
+    private int size;
+
+    private static class Node<E> {
+        public final E data;
+        public Node<E> next;
+
+        public Node(E data) {
+            this(data, null);
+        }
+
+        public Node(E data, Node<E> next) {
+            this.data = data;
+            this.next = next;
+        }
+    }
+
+    @Override
+    public int size() {
+        return this.size;
+    }
+
+    @Override
+    public void set(int idx, E elem) {
+       if (idx >= this.size || idx < 0) {
+           throw new IllegalArgumentException();
+       }
+    }
+
+    @Override
+    public E get(int idx) {
+        return null;
+    }
+
+    @Override
+    public void clear() {
+        this.head = null;
+        this.size = 0;
+    }
+
+    @Override
+    public void add(int idx, E elem) {
+        if (idx > this.size || idx < 0) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    @Override
+    public void add(E elem) {
+        if (this.head == null) {
+            this.head = new Node<>(elem);
+        }
+        else {
+            // Write only the else in C16
+            // I AM ABOUT TO WRITE CODE THAT DOESN'T WORK
+            // BEWARE!!
+
+            /*
+            Node<E> curr = this.head;
+            while (curr.next != null) {
+                curr = curr.next;
+            }
+            curr.next = new Node<>(elem);
+             */
+            Node<E> curr;
+            for (curr = this.head; curr.next != null; curr = curr.next) {
+
+            }
+        }
+        this.size++;
+    }
+}