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/02-动态数组/src/com/mj/ArrayList.java

@@ -0,0 +1,209 @@
+package com.mj;
+
+@SuppressWarnings("unchecked")
+public class ArrayList<E> {
+	/**
+	 * 元素的数量
+	 */
+	private int size;
+	/**
+	 * 所有的元素
+	 */
+	private E[] elements;
+	
+	private static final int DEFAULT_CAPACITY = 10;
+	private static final int ELEMENT_NOT_FOUND = -1;
+	
+	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;
+	}
+
+	/**
+	 * 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);
+	}
+
+	/**
+	 * 获取index位置的元素
+	 * @param index
+	 * @return
+	 */
+	public E get(int index) {
+		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) {
+		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) {
+		rangeCheckForAdd(index);
+		
+		ensureCapacity(size + 1);
+		
+		for (int i = size; i > index; i--) {
+			elements[i] = elements[i - 1];
+		}
+		elements[index] = element;
+		size++;
+	}
+
+	/**
+	 * 删除index位置的元素
+	 * @param index
+	 * @return
+	 */
+	public E remove(int index) {
+		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) {  // 1
+			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; // n
+			}
+		}
+		return ELEMENT_NOT_FOUND;
+	}
+	
+//	public int indexOf2(E element) {
+//		for (int i = 0; i < size; i++) {
+//			if (valEquals(element, elements[i])) return i; // 2n
+//		}
+//		return ELEMENT_NOT_FOUND;
+//	}
+//	
+//	private boolean valEquals(Object v1, Object v2) {
+//		return v1 == null ? v2 == null : v1.equals(v2);
+//	}
+	
+	/**
+	 * 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);
+	}
+	
+	private void outOfBounds(int index) {
+		throw new IndexOutOfBoundsException("Index:" + index + ", Size:" + size);
+	}
+	
+	private void rangeCheck(int index) {
+		if (index < 0 || index >= size) {
+			outOfBounds(index);
+		}
+	}
+	
+	private void rangeCheckForAdd(int index) {
+		if (index < 0 || index > size) {
+			outOfBounds(index);
+		}
+	}
+	
+	@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/02-动态数组/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/02-动态数组/src/com/mj/Car.java

@@ -0,0 +1,5 @@
+package com.mj;
+
+public class Car {
+
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/02-动态数组/src/com/mj/Main.java

@@ -0,0 +1,47 @@
+package com.mj;
+
+
+public class Main {
+
+	public static void main(String[] args) {
+		ArrayList<Object> list  = new ArrayList<>();
+		list.add(10);
+		list.add(new Person(10, "Jack"));
+		list.add(22);
+		
+		list.indexOf(new Person(10, "Jack"));
+		
+		
+//		ArrayList<Object> persons  = new ArrayList<>();
+//		persons.add(new Person(10, "Jack"));
+//		persons.add(null);
+//		persons.add(new Person(15, "Rose"));
+//		persons.add(null);
+//		persons.add(new Person(12, "James"));
+//		persons.add(null);
+//
+//		System.out.println(persons.indexOf(null));
+	}
+
+	static void test() {
+		// int -> Integer
+	
+		// 所有的类，最终都继承java.lang.Object
+
+		// new是向堆空间申请内存
+		ArrayList<Person> persons  = new ArrayList<>();
+		persons.add(new Person(10, "Jack"));
+		persons.add(new Person(12, "James"));
+		persons.add(new Person(15, "Rose"));
+		persons.clear();
+		persons.add(new Person(22, "abc"));
+		
+		System.out.println(persons);
+		ArrayList<Integer> ints  = new ArrayList<>();
+		ints.add(10);
+		ints.add(10);
+		ints.add(22);
+		ints.add(33);
+		System.out.println(ints);
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/02-动态数组/src/com/mj/Person.java

@@ -0,0 +1,33 @@
+package com.mj;
+
+public class Person {
+	private int age;
+	private String name;
+	
+	public Person(int age, String name) {
+		this.age = age;
+		this.name = name;
+	}
+	
+	@Override
+	public String toString() {
+		return "Person [age=" + age + ", name=" + name + "]";
+	}
+	
+	@Override
+	protected void finalize() throws Throwable {
+		super.finalize();
+		
+		System.out.println("Person - finalize");
+	}
+	
+	@Override
+	public boolean equals(Object obj) {
+		if (obj == null) return false;
+		if (obj instanceof Person) {
+			Person person  = (Person) obj;
+			return this.age == person.age;
+		}
+		return false;
+	}
+}