增加淘宝群内容，修改部分文件组织

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/AbstractList.java

@@ -0,0 +1,56 @@
+package com.mj;
+
+public abstract class AbstractList<E> implements List<E>  {
+	/**
+	 * 元素的数量
+	 */
+	protected int size;
+	/**
+	 * 元素的数量
+	 * @return
+	 */
+	public int size() {
+		return size;
+	}
+
+	/**
+	 * 是否为空
+	 * @return
+	 */
+	public boolean isEmpty() {
+		 return size == 0;
+	}
+
+	/**
+	 * 是否包含某个元素
+	 * @param element
+	 * @return
+	 */
+	public boolean contains(E element) {
+		return indexOf(element) != ELEMENT_NOT_FOUND;
+	}
+
+	/**
+	 * 添加元素到尾部
+	 * @param element
+	 */
+	public void add(E element) {
+		add(size, element);
+	}
+	
+	protected void outOfBounds(int index) {
+		throw new IndexOutOfBoundsException("Index:" + index + ", Size:" + size);
+	}
+	
+	protected void rangeCheck(int index) {
+		if (index < 0 || index >= size) {
+			outOfBounds(index);
+		}
+	}
+	
+	protected void rangeCheckForAdd(int index) {
+		if (index < 0 || index > size) {
+			outOfBounds(index);
+		}
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/ArrayList.java

@@ -0,0 +1,154 @@
+package com.mj;
+
+@SuppressWarnings("unchecked")
+public class ArrayList<E> extends AbstractList<E> {
+	/**
+	 * 所有的元素
+	 */
+	private E[] elements;
+	private static final int DEFAULT_CAPACITY = 10;
+	
+	public ArrayList(int capaticy) {
+		capaticy = (capaticy < DEFAULT_CAPACITY) ? DEFAULT_CAPACITY : capaticy;
+		elements = (E[]) new Object[capaticy];
+	}
+	
+	public ArrayList() {
+		this(DEFAULT_CAPACITY);
+	}
+	
+	/**
+	 * 清除所有元素
+	 */
+	public void clear() {
+		for (int i = 0; i < size; i++) {
+			elements[i] = null;
+		}
+		size = 0;
+	}
+
+	/**
+	 * 获取index位置的元素
+	 * @param index
+	 * @return
+	 */
+	public E get(int index) { // O(1)
+		rangeCheck(index);
+		
+		return elements[index]; 
+	}
+
+	/**
+	 * 设置index位置的元素
+	 * @param index
+	 * @param element
+	 * @return 原来的元素ֵ
+	 */
+	public E set(int index, E element) { // O(1)
+		rangeCheck(index);
+		
+		E old = elements[index];
+		elements[index] = element;
+		return old;
+	}
+
+	/**
+	 * 在index位置插入一个元素
+	 * @param index
+	 * @param element
+	 */
+	public void add(int index, E element) { 
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		rangeCheckForAdd(index);
+		
+		ensureCapacity(size + 1);
+		
+		for (int i = size; i > index; i--) {
+			elements[i] = elements[i - 1];
+		}
+		elements[index] = element;
+		size++;
+	} // size是数据规模
+
+	/**
+	 * 删除index位置的元素
+	 * @param index
+	 * @return
+	 */
+	public E remove(int index) {
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		rangeCheck(index);
+		
+		E old = elements[index];
+		for (int i = index + 1; i < size; i++) {
+			elements[i - 1] = elements[i];
+		}
+		elements[--size] = null;
+		return old;
+	}
+
+	/**
+	 * 查看元素的索引
+	 * @param element
+	 * @return
+	 */
+	public int indexOf(E element) {
+		if (element == null) {
+			for (int i = 0; i < size; i++) {
+				if (elements[i] == null) return i;
+			}
+		} else {
+			for (int i = 0; i < size; i++) {
+				if (element.equals(elements[i])) return i;
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+	/**
+	 * 保证要有capacity的容量
+	 * @param capacity
+	 */
+	private void ensureCapacity(int capacity) {
+		int oldCapacity = elements.length;
+		if (oldCapacity >= capacity) return;
+		
+		// 新容量为旧容量的1.5倍
+		int newCapacity = oldCapacity + (oldCapacity >> 1);
+		E[] newElements = (E[]) new Object[newCapacity];
+		for (int i = 0; i < size; i++) {
+			newElements[i] = elements[i];
+		}
+		elements = newElements;
+		
+		System.out.println(oldCapacity + "扩容为" + newCapacity);
+	}
+	
+	@Override
+	public String toString() {
+		// size=3, [99, 88, 77]
+		StringBuilder string = new StringBuilder();
+		string.append("size=").append(size).append(", [");
+		for (int i = 0; i < size; i++) {
+			if (i != 0) {
+				string.append(", ");
+			}
+			
+			string.append(elements[i]);
+			
+//			if (i != size - 1) {
+//				string.append(", ");
+//			}
+		}
+		string.append("]");
+		return string.toString();
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/ArrayList2.java

@@ -0,0 +1,189 @@
+package com.mj;
+
+@SuppressWarnings("unchecked")
+
+/**
+ * 有动态缩容操作
+ * @author MJ Lee
+ *
+ * @param <E>
+ */
+public class ArrayList2<E> extends AbstractList<E> {
+	/**
+	 * 所有的元素
+	 */
+	private E[] elements;
+	private static final int DEFAULT_CAPACITY = 10;
+	
+	public ArrayList2(int capaticy) {
+		capaticy = (capaticy < DEFAULT_CAPACITY) ? DEFAULT_CAPACITY : capaticy;
+		elements = (E[]) new Object[capaticy];
+	}
+	
+	public ArrayList2() {
+		this(DEFAULT_CAPACITY);
+	}
+	
+	/**
+	 * 清除所有元素
+	 */
+	public void clear() {
+		for (int i = 0; i < size; i++) {
+			elements[i] = null;
+		}
+		size = 0;
+		
+		// 仅供参考
+		if (elements != null && elements.length > DEFAULT_CAPACITY) {
+			elements = (E[]) new Object[DEFAULT_CAPACITY];
+		}
+	}
+
+	/**
+	 * 获取index位置的元素
+	 * @param index
+	 * @return
+	 */
+	public E get(int index) { // O(1)
+		rangeCheck(index);
+		
+		return elements[index]; 
+	}
+
+	/**
+	 * 设置index位置的元素
+	 * @param index
+	 * @param element
+	 * @return 原来的元素ֵ
+	 */
+	public E set(int index, E element) { // O(1)
+		rangeCheck(index);
+		
+		E old = elements[index];
+		elements[index] = element;
+		return old;
+	}
+
+	/**
+	 * 在index位置插入一个元素
+	 * @param index
+	 * @param element
+	 */
+	public void add(int index, E element) { 
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		rangeCheckForAdd(index);
+		
+		ensureCapacity(size + 1);
+		
+		for (int i = size; i > index; i--) {
+			elements[i] = elements[i - 1];
+		}
+		elements[index] = element;
+		size++;
+	} // size是数据规模
+
+	/**
+	 * 删除index位置的元素
+	 * @param index
+	 * @return
+	 */
+	public E remove(int index) {
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		rangeCheck(index);
+		
+		E old = elements[index];
+		for (int i = index + 1; i < size; i++) {
+			elements[i - 1] = elements[i];
+		}
+		elements[--size] = null;
+		
+		trim();
+		
+		return old;
+	}
+
+	/**
+	 * 查看元素的索引
+	 * @param element
+	 * @return
+	 */
+	public int indexOf(E element) {
+		if (element == null) {
+			for (int i = 0; i < size; i++) {
+				if (elements[i] == null) return i;
+			}
+		} else {
+			for (int i = 0; i < size; i++) {
+				if (element.equals(elements[i])) return i;
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+	/**
+	 * 保证要有capacity的容量
+	 * @param capacity
+	 */
+	private void ensureCapacity(int capacity) {
+		int oldCapacity = elements.length;
+		if (oldCapacity >= capacity) return;
+		
+		// 新容量为旧容量的1.5倍
+		int newCapacity = oldCapacity + (oldCapacity >> 1);
+		
+		// 新容量为旧容量的2倍
+		// int newCapacity = oldCapacity << 1;
+		E[] newElements = (E[]) new Object[newCapacity];
+		for (int i = 0; i < size; i++) {
+			newElements[i] = elements[i];
+		}
+		elements = newElements;
+		
+		System.out.println(oldCapacity + "扩容为" + newCapacity);
+	}
+	
+	private void trim() {
+		// 30
+		int oldCapacity = elements.length;
+		// 15
+		int newCapacity = oldCapacity >> 1;
+		if (size > (newCapacity) || oldCapacity <= DEFAULT_CAPACITY) return;
+		
+		// 剩余空间还很多
+		E[] newElements = (E[]) new Object[newCapacity];
+		for (int i = 0; i < size; i++) {
+			newElements[i] = elements[i];
+		}
+		elements = newElements;
+		
+		System.out.println(oldCapacity + "缩容为" + newCapacity);
+	}
+	
+	@Override
+	public String toString() {
+		// size=3, [99, 88, 77]
+		StringBuilder string = new StringBuilder();
+		string.append("size=").append(size).append(", [");
+		for (int i = 0; i < size; i++) {
+			if (i != 0) {
+				string.append(", ");
+			}
+			
+			string.append(elements[i]);
+			
+//			if (i != size - 1) {
+//				string.append(", ");
+//			}
+		}
+		string.append("]");
+		return string.toString();
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/Asserts.java

@@ -0,0 +1,11 @@
+package com.mj;
+
+public class Asserts {
+	public static void test(boolean value) {
+		try {
+			if (!value) throw new Exception("测试未通过");
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/LinkedList.java

@@ -0,0 +1,175 @@
+package com.mj;
+
+import com.mj.AbstractList;
+
+public class LinkedList<E> extends AbstractList<E> {
+	private Node<E> first;
+	private Node<E> last;
+	
+	private static class Node<E> {
+		E element;
+		Node<E> prev;
+		Node<E> next;
+		public Node(Node<E> prev, E element, Node<E> next) {
+			this.prev = prev;
+			this.element = element;
+			this.next = next;
+		}
+		
+		@Override
+		public String toString() {
+			StringBuilder sb = new StringBuilder();
+			
+			if (prev != null) {
+				sb.append(prev.element);
+			} else {
+				sb.append("null");
+			}
+			
+			sb.append("_").append(element).append("_");
+
+			if (next != null) {
+				sb.append(next.element);
+			} else {
+				sb.append("null");
+			}
+			
+			return sb.toString();
+		}
+	}
+
+	@Override
+	public void clear() {
+		size = 0;
+		first = null;
+		last = null;
+	}
+
+	@Override
+	public E get(int index) {
+		return node(index).element;
+	}
+
+	@Override
+	public E set(int index, E element) {
+		Node<E> node = node(index);
+		E old = node.element;
+		node.element = element;
+		return old;
+	}
+
+	@Override
+	public void add(int index, E element) {
+		rangeCheckForAdd(index);
+
+		// size == 0
+		// index == 0
+		if (index == size) { // 往最后面添加元素
+			Node<E> oldLast = last;
+			last = new Node<>(oldLast, element, null);
+			if (oldLast == null) { // 这是链表添加的第一个元素
+				first = last;
+			} else {
+				oldLast.next = last;
+			}
+		} else {
+			Node<E> next = node(index); 
+			Node<E> prev = next.prev; 
+			Node<E> node = new Node<>(prev, element, next);
+			next.prev = node;
+			
+			if (prev == null) { // index == 0
+				first = node;
+			} else {
+				prev.next = node;
+			}
+		}
+		
+		size++;
+	}
+
+	@Override
+	public E remove(int index) {
+		rangeCheck(index);
+
+		Node<E> node = node(index);
+		Node<E> prev = node.prev;
+		Node<E> next = node.next;
+		
+		if (prev == null) { // index == 0
+			first = next;
+		} else {
+			prev.next = next;
+		}
+		
+		if (next == null) { // index == size - 1
+			last = prev;
+		} else {
+			next.prev = prev;
+		}
+		
+		size--;
+		return node.element;
+	}
+
+	@Override
+	public int indexOf(E element) {
+		if (element == null) {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (node.element == null) return i;
+				
+				node = node.next;
+			}
+		} else {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (element.equals(node.element)) return i;
+				
+				node = node.next;
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+	/**
+	 * 获取index位置对应的节点对象
+	 * @param index
+	 * @return
+	 */
+	private Node<E> node(int index) {
+		rangeCheck(index);
+		
+		if (index < (size >> 1)) {
+			Node<E> node = first;
+			for (int i = 0; i < index; i++) {
+				node = node.next;
+			}
+			return node;
+		} else {
+			Node<E> node = last;
+			for (int i = size - 1; i > index; i--) {
+				node = node.prev;
+			}
+			return node;
+		}
+	}
+	
+	@Override
+	public String toString() {
+		StringBuilder string = new StringBuilder();
+		string.append("size=").append(size).append(", [");
+		Node<E> node = first;
+		for (int i = 0; i < size; i++) {
+			if (i != 0) {
+				string.append(", ");
+			}
+			
+			string.append(node);
+			
+			node = node.next;
+		}
+		string.append("]");
+		return string.toString();
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/List.java

@@ -0,0 +1,70 @@
+package com.mj;
+
+public interface List<E> {
+	static final int ELEMENT_NOT_FOUND = -1;
+	/**
+	 * 清除所有元素
+	 */
+	void clear();
+
+	/**
+	 * 元素的数量
+	 * @return
+	 */
+	int size();
+
+	/**
+	 * 是否为空
+	 * @return
+	 */
+	boolean isEmpty();
+
+	/**
+	 * 是否包含某个元素
+	 * @param element
+	 * @return
+	 */
+	boolean contains(E element);
+
+	/**
+	 * 添加元素到尾部
+	 * @param element
+	 */
+	void add(E element);
+
+	/**
+	 * 获取index位置的元素
+	 * @param index
+	 * @return
+	 */
+	E get(int index);
+
+	/**
+	 * 设置index位置的元素
+	 * @param index
+	 * @param element
+	 * @return 原来的元素ֵ
+	 */
+	E set(int index, E element);
+
+	/**
+	 * 在index位置插入一个元素
+	 * @param index
+	 * @param element
+	 */
+	void add(int index, E element);
+
+	/**
+	 * 删除index位置的元素
+	 * @param index
+	 * @return
+	 */
+	E remove(int index);
+
+	/**
+	 * 查看元素的索引
+	 * @param element
+	 * @return
+	 */
+	int indexOf(E element);
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/Main.java

@@ -0,0 +1,64 @@
+package com.mj;
+
+import com.mj.circle.CircleLinkedList;
+
+public class Main {
+	
+	static void testList(List<Integer> list) {
+		list.add(11);
+		list.add(22);
+		list.add(33);
+		list.add(44);
+
+		list.add(0, 55); // [55, 11, 22, 33, 44]
+		list.add(2, 66); // [55, 11, 66, 22, 33, 44]
+		list.add(list.size(), 77); // [55, 11, 66, 22, 33, 44, 77]
+
+		list.remove(0); // [11, 66, 22, 33, 44, 77]
+		list.remove(2); // [11, 66, 33, 44, 77]
+		list.remove(list.size() - 1); // [11, 66, 33, 44]
+
+		Asserts.test(list.indexOf(44) == 3);
+		Asserts.test(list.indexOf(22) == List.ELEMENT_NOT_FOUND);
+		Asserts.test(list.contains(33));
+		Asserts.test(list.get(0) == 11);
+		Asserts.test(list.get(1) == 66);
+		Asserts.test(list.get(list.size() - 1) == 44);
+		
+		System.out.println(list);
+	}
+	
+	static void josephus() {
+		CircleLinkedList<Integer> list = new CircleLinkedList<>();
+		for (int i = 1; i <= 8; i++) {
+			list.add(i);
+		}
+		
+		// 指向头结点（指向1）
+		list.reset();
+		
+		while (!list.isEmpty()) {
+			list.next();
+			list.next();
+			System.out.println(list.remove());
+		}
+	}
+
+	public static void main(String[] args) {
+		josephus();
+		
+//		testList(new ArrayList<>());
+//		testList(new LinkedList<>());
+		
+		
+		// testList(new SingleCircleLinkedList<>());
+		
+		// testList(new CircleLinkedList<>());
+		
+		/*
+		 * gc root对象
+		 * 1> 被局部变量指向的对象
+		 */
+	}
+
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/circle/CircleLinkedList.java

@@ -0,0 +1,208 @@
+package com.mj.circle;
+
+import com.mj.AbstractList;
+
+public class CircleLinkedList<E> extends AbstractList<E> {
+	private Node<E> first;
+	private Node<E> last;
+	private Node<E> current; 
+	
+	private static class Node<E> {
+		E element;
+		Node<E> prev;
+		Node<E> next;
+		public Node(Node<E> prev, E element, Node<E> next) {
+			this.prev = prev;
+			this.element = element;
+			this.next = next;
+		}
+		
+		@Override
+		public String toString() {
+			StringBuilder sb = new StringBuilder();
+			
+			if (prev != null) {
+				sb.append(prev.element);
+			} else {
+				sb.append("null");
+			}
+			
+			sb.append("_").append(element).append("_");
+
+			if (next != null) {
+				sb.append(next.element);
+			} else {
+				sb.append("null");
+			}
+			
+			return sb.toString();
+		}
+	}
+	
+	public void reset() {
+		current = first;
+	}
+	
+	public E next() {
+		if (current == null) return null;
+		
+		current = current.next;
+		return current.element;
+	}
+	
+	public E remove() {
+		if (current == null) return null;
+		
+		Node<E> next = current.next; 
+		E element = remove(current);
+		if (size == 0) {
+			current = null;
+		} else {
+			current = next;
+		}
+		
+		return element;
+	}
+
+	@Override
+	public void clear() {
+		size = 0;
+		first = null;
+		last = null;
+	}
+
+	@Override
+	public E get(int index) {
+		return node(index).element;
+	}
+
+	@Override
+	public E set(int index, E element) {
+		Node<E> node = node(index);
+		E old = node.element;
+		node.element = element;
+		return old;
+	}
+
+	@Override
+	public void add(int index, E element) {
+		rangeCheckForAdd(index);
+
+		// size == 0
+		// index == 0
+		if (index == size) { // 往最后面添加元素
+			Node<E> oldLast = last;
+			last = new Node<>(oldLast, element, first);
+			if (oldLast == null) { // 这是链表添加的第一个元素
+				first = last;
+				first.next = first;
+				first.prev = first;
+			} else {
+				oldLast.next = last;
+				first.prev = last;
+			}
+		} else {
+			Node<E> next = node(index); 
+			Node<E> prev = next.prev; 
+			Node<E> node = new Node<>(prev, element, next);
+			next.prev = node;
+			prev.next = node;
+			
+			if (next == first) { // index == 0
+				first = node;
+			}
+		}
+		
+		size++;
+	}
+
+	@Override
+	public E remove(int index) {
+		rangeCheck(index);
+		return remove(node(index));
+	}
+	
+	private E remove(Node<E> node) {
+		if (size == 1) {
+			first = null;
+			last = null;
+		} else {
+			Node<E> prev = node.prev;
+			Node<E> next = node.next;
+			prev.next = next;
+			next.prev = prev;
+			
+			if (node == first) { // index == 0
+				first = next;
+			}
+			
+			if (node == last) { // index == size - 1
+				last = prev;
+			}
+		}
+		
+		size--;
+		return node.element;
+	}
+
+	@Override
+	public int indexOf(E element) {
+		if (element == null) {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (node.element == null) return i;
+				
+				node = node.next;
+			}
+		} else {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (element.equals(node.element)) return i;
+				
+				node = node.next;
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+	/**
+	 * 获取index位置对应的节点对象
+	 * @param index
+	 * @return
+	 */
+	private Node<E> node(int index) {
+		rangeCheck(index);
+		
+		if (index < (size >> 1)) {
+			Node<E> node = first;
+			for (int i = 0; i < index; i++) {
+				node = node.next;
+			}
+			return node;
+		} else {
+			Node<E> node = last;
+			for (int i = size - 1; i > index; i--) {
+				node = node.prev;
+			}
+			return node;
+		}
+	}
+	
+	@Override
+	public String toString() {
+		StringBuilder string = new StringBuilder();
+		string.append("size=").append(size).append(", [");
+		Node<E> node = first;
+		for (int i = 0; i < size; i++) {
+			if (i != 0) {
+				string.append(", ");
+			}
+			
+			string.append(node);
+			
+			node = node.next;
+		}
+		string.append("]");
+		return string.toString();
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/circle/SingleCircleLinkedList.java

@@ -0,0 +1,135 @@
+package com.mj.circle;
+
+import com.mj.AbstractList;
+
+public class SingleCircleLinkedList<E> extends AbstractList<E> {
+	private Node<E> first;
+	
+	private static class Node<E> {
+		E element;
+		Node<E> next;
+		public Node(E element, Node<E> next) {
+			this.element = element;
+			this.next = next;
+		}
+		
+		@Override
+		public String toString() {
+			StringBuilder sb = new StringBuilder();
+			sb.append(element).append("_").append(next.element);
+			return sb.toString();
+		}
+	}
+
+	@Override
+	public void clear() {
+		size = 0;
+		first = null;
+	}
+
+	@Override
+	public E get(int index) {
+		return node(index).element;
+	}
+
+	@Override
+	public E set(int index, E element) {
+		Node<E> node = node(index);
+		E old = node.element;
+		node.element = element;
+		return old;
+	}
+
+	@Override
+	public void add(int index, E element) {
+		rangeCheckForAdd(index);
+		
+		if (index == 0) {
+			Node<E> newFirst = new Node<>(element, first);
+			// 拿到最后一个节点
+			Node<E> last = (size == 0) ? newFirst : node(size - 1);
+			last.next = newFirst;
+			first = newFirst;
+		} else {
+			Node<E> prev = node(index - 1);
+			prev.next = new Node<>(element, prev.next);
+		}
+		size++;
+	}
+
+	@Override
+	public E remove(int index) {
+		rangeCheck(index);
+		
+		Node<E> node = first;
+		if (index == 0) {
+			if (size == 1) {
+				first = null;
+			} else {
+				Node<E> last = node(size - 1);
+				first = first.next;
+				last.next = first;
+			}
+		} else {
+			Node<E> prev = node(index - 1);
+			node = prev.next;
+			prev.next = node.next;
+		}
+		size--;
+		return node.element;
+	}
+
+	@Override
+	public int indexOf(E element) {
+		if (element == null) {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (node.element == null) return i;
+				
+				node = node.next;
+			}
+		} else {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (element.equals(node.element)) return i;
+				
+				node = node.next;
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+	/**
+	 * 获取index位置对应的节点对象
+	 * @param index
+	 * @return
+	 */
+	private Node<E> node(int index) {
+		rangeCheck(index);
+		
+		Node<E> node = first;
+		for (int i = 0; i < index; i++) {
+			node = node.next;
+		}
+		
+		return node;
+	}
+	
+	@Override
+	public String toString() {
+		StringBuilder string = new StringBuilder();
+		string.append("size=").append(size).append(", [");
+		Node<E> node = first;
+		for (int i = 0; i < size; i++) {
+			if (i != 0) {
+				string.append(", ");
+			}
+			
+			string.append(node);
+			
+			node = node.next;
+		}
+		string.append("]");
+		return string.toString();
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/single/SingleLinkedList.java

@@ -0,0 +1,144 @@
+package com.mj.single;
+
+import com.mj.AbstractList;
+
+public class SingleLinkedList<E> extends AbstractList<E> {
+	private Node<E> first;
+	
+	private static class Node<E> {
+		E element;
+		Node<E> next;
+		public Node(E element, Node<E> next) {
+			this.element = element;
+			this.next = next;
+		}
+	}
+
+	@Override
+	public void clear() {
+		size = 0;
+		first = null;
+	}
+
+	@Override
+	public E get(int index) {
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		return node(index).element;
+	}
+
+	@Override
+	public E set(int index, E element) {
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		Node<E> node = node(index);
+		E old = node.element;
+		node.element = element;
+		return old;
+	}
+
+	@Override
+	public void add(int index, E element) {
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		rangeCheckForAdd(index);
+		
+		if (index == 0) {
+			first = new Node<>(element, first);
+		} else {
+			Node<E> prev = node(index - 1);
+			prev.next = new Node<>(element, prev.next);
+		}
+		size++;
+	}
+
+	@Override
+	public E remove(int index) {
+		/*
+		 * 最好：O(1)
+		 * 最坏：O(n)
+		 * 平均：O(n)
+		 */
+		rangeCheck(index);
+		
+		Node<E> node = first;
+		if (index == 0) {
+			first = first.next;
+		} else {
+			Node<E> prev = node(index - 1);
+			node = prev.next;
+			prev.next = node.next;
+		}
+		size--;
+		return node.element;
+	}
+
+	@Override
+	public int indexOf(E element) {
+		if (element == null) {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (node.element == null) return i;
+				
+				node = node.next;
+			}
+		} else {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (element.equals(node.element)) return i;
+				
+				node = node.next;
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+	/**
+	 * 获取index位置对应的节点对象
+	 * @param index
+	 * @return
+	 */
+	private Node<E> node(int index) {
+		rangeCheck(index);
+		
+		Node<E> node = first;
+		for (int i = 0; i < index; i++) {
+			node = node.next;
+		}
+		return node;
+	}
+	
+	@Override
+	public String toString() {
+		StringBuilder string = new StringBuilder();
+		string.append("size=").append(size).append(", [");
+		Node<E> node = first;
+		for (int i = 0; i < size; i++) {
+			if (i != 0) {
+				string.append(", ");
+			}
+			
+			string.append(node.element);
+			
+			node = node.next;
+		}
+		string.append("]");
+		
+//		Node<E> node1 = first;
+//		while (node1 != null) {
+//			
+//			
+//			node1 = node1.next;
+//		}
+		return string.toString();
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/03-链表/src/com/mj/single/SingleLinkedList2.java

@@ -0,0 +1,127 @@
+package com.mj.single;
+
+import com.mj.AbstractList;
+
+/**
+ * 增加一个虚拟头结点
+ * @author MJ Lee
+ *
+ * @param <E>
+ */
+public class SingleLinkedList2<E> extends AbstractList<E> {
+	private Node<E> first;
+	
+	public SingleLinkedList2() {
+		first = new Node<>(null, null);
+	}
+	
+	private static class Node<E> {
+		E element;
+		Node<E> next;
+		public Node(E element, Node<E> next) {
+			this.element = element;
+			this.next = next;
+		}
+	}
+
+	@Override
+	public void clear() {
+		size = 0;
+		first = null;
+	}
+
+	@Override
+	public E get(int index) {
+		return node(index).element;
+	}
+
+	@Override
+	public E set(int index, E element) {
+		Node<E> node = node(index);
+		E old = node.element;
+		node.element = element;
+		return old;
+	}
+
+	@Override
+	public void add(int index, E element) {
+		rangeCheckForAdd(index);
+		
+		Node<E> prev = index == 0 ? first : node(index - 1);
+		prev.next = new Node<>(element, prev.next);
+
+		size++;
+	}
+
+	@Override
+	public E remove(int index) {
+		rangeCheck(index);
+		
+		Node<E> prev = index == 0 ? first : node(index - 1);
+		Node<E> node = prev.next;
+		prev.next = node.next;
+			
+		size--;
+		return node.element;
+	}
+
+	@Override
+	public int indexOf(E element) {
+		if (element == null) {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (node.element == null) return i;
+				
+				node = node.next;
+			}
+		} else {
+			Node<E> node = first;
+			for (int i = 0; i < size; i++) {
+				if (element.equals(node.element)) return i;
+				
+				node = node.next;
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+	/**
+	 * 获取index位置对应的节点对象
+	 * @param index
+	 * @return
+	 */
+	private Node<E> node(int index) {
+		rangeCheck(index);
+		
+		Node<E> node = first.next;
+		for (int i = 0; i < index; i++) {
+			node = node.next;
+		}
+		return node;
+	}
+	
+	@Override
+	public String toString() {
+		StringBuilder string = new StringBuilder();
+		string.append("size=").append(size).append(", [");
+		Node<E> node = first.next;
+		for (int i = 0; i < size; i++) {
+			if (i != 0) {
+				string.append(", ");
+			}
+			
+			string.append(node.element);
+			
+			node = node.next;
+		}
+		string.append("]");
+		
+//		Node<E> node1 = first;
+//		while (node1 != null) {
+//			
+//			
+//			node1 = node1.next;
+//		}
+		return string.toString();
+	}
+}