Merge pull request #23 from Greastate/master

八组作业提交

group08/121027265/0226/cpu_内存_硬盘_指令之间关系.md

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+## cpu 内存 硬盘 指令之间的关系
+> 计算机整体分为软件和硬件。
+> 软件是由指令和数据组成的程序，硬件包含主板、CPU、内存、硬盘等
+
+
+指令指的是计算机可以识别的机器语言，每个操作系统都有内置的指令集，计算机可根据不同的指令来驱动计算机工作或是相应的输出。指令是以二进制的形式存储在硬盘中，当CPU执行某个指令的时候，需要将指令先从硬盘加载到内存，CPU从内存中获取执行解释执行。
+
+CPU是计算的核心部件，相当于人类的大脑。CPU执行指令的时候其实不关心也不知道指令的意思，只是按照指令执行。由于硬盘读写性能比较差，CPU从硬盘中直接读取数据的时候比较费时，就有的内存的存在。内存比硬盘读写速度快很多，CPU要执行程序时，先将程序加载到内存中在执行。

group08/121027265/0226/src/com/my/list/ArrayList.java

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+package com.my.list;
+
+/**
+ * 实现ArrayList
+ *
+ */
+public class ArrayList {
+	//初始化容量
+	private static final int INIT = 5;
+	//增长因子
+	private static final double GROWTH = 0.5;
+
+	//初始化数组
+	Object[] baseArr = new Object[INIT];
+	//当前下标
+	int currentIndex = 0;
+	//最大下标
+	int maxIndex = INIT-1;
+
+	/**
+	 * 添加元素
+	 * @param obj
+	 * @return
+	 */
+	public Object add(Object obj){
+		if(judgeCapacity()){
+			baseArr = arrayDilatation(baseArr, GROWTH);
+			maxIndex = baseArr.length-1;
+		}
+		baseArr[currentIndex] = obj;
+		++currentIndex;
+		return obj;
+	}
+
+	/**
+	 * 指定下标添加元素
+	 * @param index
+	 * @param obj
+	 * @return
+	 */
+	public Object add(int index , Object obj){
+		if (index < 0 || index > currentIndex) {
+			throw new IndexOutOfBoundsException();
+		}
+		Object[] dest = new Object[currentIndex+1];
+		System.arraycopy(baseArr, 0, dest, 0, index);
+		dest[index] = obj;
+		System.arraycopy(baseArr, index, dest, index+1, currentIndex-index);
+		++currentIndex;
+		baseArr = dest;
+		return obj;
+	}
+
+	/**
+	 * 指定下标删除元素 
+	 * @param index
+	 * @return
+	 */
+	public Object remove(int index){
+		if (index < 0 || index >= currentIndex) {
+			throw new IndexOutOfBoundsException();
+		}
+		Object object = baseArr[index];
+		Object[] dest = new Object[currentIndex];
+		System.arraycopy(baseArr, 0, dest, 0, index);
+		System.arraycopy(baseArr, index+1, dest, index, currentIndex-index-1);
+		--currentIndex;
+		baseArr = dest;
+		return object;
+	}
+
+	/**
+	 * 根据下标获取元素
+	 * @param index
+	 * @return
+	 */
+	public Object get(int index){
+
+		return baseArr[index];
+	}
+
+	/**
+	 * 获取集合大小
+	 * @return
+	 */
+	public int size(){
+		return currentIndex;
+	}
+
+	/**
+	 * 判断容量是否需要增加
+	 * @return
+	 */
+	public boolean judgeCapacity(){
+		if(currentIndex > maxIndex){
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * 数组扩容
+	 * @param objArr
+	 * @param groth
+	 * @return
+	 */
+	public static Object[] arrayDilatation(Object[] objArr , double groth){
+		   int length = objArr.length;
+		   int newLength = (int) (length * groth + length);
+		   Object[] baseArr = new Object[newLength];
+		   System.arraycopy(objArr, 0, baseArr, 0, length);
+		   return baseArr;
+	}
+
+
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

group08/121027265/0226/src/com/my/list/LinkedList.java

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+package com.my.list;
+
+/**
+ * 实现 LinkedList
+ *
+ */
+public class LinkedList {
+
+	//首节点
+	Node first = new Node();
+	//集合大小
+	int size = 0;
+
+	/**
+	 * 添加元素
+	 * @param object
+	 * @return
+	 */
+	public Object add(Object object){
+		if (size == 0) {
+			first.setObject(object);
+		}else{
+			Node previous = first;
+			Node temp = first.getNext();
+			while (temp != null) {
+				previous = temp;
+				temp = temp.getNext();
+			}
+			Node node = new Node();
+			node.setObject(object);
+			previous.setNext(node);
+		}
+		++size;
+		return object;
+	}
+
+	/**
+	 * 根据下标添加元素
+	 * @param index
+	 * @param object
+	 * @return
+	 */
+	public Object add(int index , Object object){
+		if (index < 0 || index > size) {
+			throw new IndexOutOfBoundsException();
+		}
+
+		if (size == 0) {
+			first.setObject(object);
+		}else{
+			if (index == 0) {
+				Node temp = new Node();
+				temp.setObject(object);
+				temp.setNext(first);
+				first = temp;
+			}else{
+				int count = 1;
+				Node temp = first;
+				while (temp != null) {
+					if (count++ == index) {
+						Node next = temp.getNext();
+						Node node = new Node();
+						temp.setNext(node); 
+						node.setObject(object);
+						node.setNext(next);
+						break;
+					}
+					temp = temp.getNext();
+				}
+			}
+		}
+		++size;
+		return object;
+	}
+
+	/**
+	 * 根据下标删除元素
+	 * @param index
+	 * @return
+	 */
+	public Object remove(int index){
+		if (index < 0 || index >= size) {
+			throw new IndexOutOfBoundsException();
+		}
+		Node node = null;
+		if (index == 0) {
+			Node next = first.getNext();
+			first = next;
+			node = first;
+		}else{
+			int count = 1;
+			Node temp = first;
+			while (temp != null) {
+				if (count++ == index) {
+					node = temp.getNext();
+					Node next = node.getNext();
+					temp.setNext(next); 
+					break;
+				}
+				temp = temp.getNext();
+			}
+		}
+		--size;
+		return node.getObject();
+	}
+
+	/**
+	 * 根据下标获取元素
+	 * @param index
+	 * @return
+	 */
+	public Object get(int index) {
+		Node temp = first;
+		int count = 0;
+		while (temp != null) {
+			if (count++ == index) {
+				break;
+			}
+			temp = temp.getNext();
+		}
+		return temp.getObject();
+	}
+
+	/**
+	 * 获取集合大小
+	 * @return
+	 */
+	public int size() {
+		return size;
+	}
+
+
+}
+
+
+/**
+ * 节点元素
+ *
+ */
+class Node{
+	private Object object ;
+	private Node next;
+	public Object getObject() {
+		return object;
+	}
+	public void setObject(Object object) {
+		this.object = object;
+	}
+	public Node getNext() {
+		return next;
+	}
+	public void setNext(Node next) {
+		this.next = next;
+	}
+
+}

group08/121027265/0226/src/com/my/list/Test.java

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+package com.my.list;
+
+public class Test {
+
+	public static void main(String[] args) {
+
+		testArrayList();
+		System.out.println("--------------------------------");
+		testLinkedList();
+	}
+
+	/**
+	 * ArrayList 测试
+	 */
+	public static void testArrayList(){
+		System.out.println("ArrayList 测试 --开始");
+		ArrayList list = new ArrayList();
+		list.add("123");
+		list.add("123");
+		list.add("123");
+		list.add("123");
+		list.add("123");
+		list.add("123");
+
+		list.add(1, 111);
+
+		list.remove(1);
+
+		System.out.println(list.baseArr.length);
+		System.out.println(list.size());
+
+		for (int i = 0; i < list.size(); i++) {
+			Object object = list.get(i);
+			System.out.println(object);
+		}
+		System.out.println("ArrayList 测试 --结束");
+	}
+
+	/**
+	 * LinkedList 测试
+	 */
+	public static void testLinkedList(){
+		System.out.println("LinkedList 测试 --开始");
+		LinkedList list = new LinkedList();
+		list.add(1);
+		list.add(2);
+		list.add(3);
+		list.add(4);
+		list.add(5);
+		list.add(6);
+
+		list.add(1, 111);
+
+		list.remove(1);
+
+		System.out.println(list.size());
+
+		for (int i = 0; i < list.size(); i++) {
+			Object object = list.get(i);
+			System.out.println(object);
+		}
+		System.out.println("LinkedList 测试 --结束");
+	}
+
+}