feat: 덱 구현 시작

Author: ksundong

yoonexample/src/main/java/deque/LinkedLIstDeque.java

@@ -0,0 +1,59 @@
+package deque;
+
+public class LinkedLIstDeque<E> implements Deque<E> {
+
+  private int size;
+  private Node<E> head;
+  private Node<E> tail;
+
+  @Override
+  public int size() {
+    return this.size;
+  }
+
+  @Override
+  public boolean isEmpty() {
+    return this.size == 0;
+  }
+
+  @Override
+  public void addFirst(E data) {
+
+  }
+
+  @Override
+  public void addLast(E data) {
+
+  }
+
+  @Override
+  public E removeFirst() {
+    return null;
+  }
+
+  @Override
+  public E removeLast() {
+    return null;
+  }
+
+  @Override
+  public E getFirst() {
+    return null;
+  }
+
+  @Override
+  public E getLast() {
+    return null;
+  }
+
+  private static class Node<T> {
+
+    private T data;
+    private Node<T> next;
+    private Node<T> prev;
+
+    public Node(T data) {
+      this.data = data;
+    }
+  }
+}