Merge pull request #2 from nusubmarine01/master

update

group03/1360464792/.gitignore

@@ -0,0 +1,34 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### maven
+target

group03/1360464792/pom.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>rui.study</groupId>
+    <artifactId>coding2017</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <name>学习数据结构</name>
+
+    <properties>
+        <java.version>1.6</java.version>
+        <encoding>UTF-8</encoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <finalName>coding2017</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                    <encoding>${encoding}</encoding>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

group03/1360464792/src/main/java/rui/study/coding2017/ArrayList.java

@@ -0,0 +1,142 @@
+package rui.study.coding2017;
+
+
+import java.util.Arrays;
+import java.util.NoSuchElementException;
+
+public class ArrayList implements List {
+
+    private int size;
+
+    private Object[] elementData;
+
+    private static Object[] emptyObjects={};
+
+    private static int defaultCapacity=10;
+
+    public void add(Object o){
+        ensureCapacity(this.size+1);
+        elementData[size++]=o;
+    }
+
+    public void add(int index, Object o){
+        rangeCheckForAdd(index);
+        if(elementData[index]!=null){
+            ensureCapacity(this.size+1);
+            //执行数组拷贝
+            System.arraycopy(elementData,index,elementData,index+1,size-index);
+            size++;
+        }
+        elementData[index]=o;
+    }
+
+    public Object get(int index){
+        rangeCheck(index);
+        return elementData[index];
+    }
+
+    public Object remove(int index){
+        rangeCheck(index);
+        Object object=elementData[index];
+
+        int numMoved=size-index-1;
+        //如果是最后一位remove ，无需进行数组拷贝
+        if(numMoved>0){
+            System.arraycopy(elementData, index+1, elementData, index,numMoved);
+        }
+        elementData[--size]=null;
+        return object;
+    }
+
+    public int size(){
+        return this.size;
+    }
+
+    public Iterator iterator(){
+        return new ArrayListIterator();
+    }
+
+    public ArrayList(){
+        this.size=0;
+        this.elementData=emptyObjects;
+    }
+
+    public ArrayList(int size){
+        this.size=size;
+        if(size>0){
+            this.elementData=new Object[size];
+        }else if(size==0){
+            this.elementData=emptyObjects;
+        }else{
+            throw new IllegalArgumentException("非法容器大小 "+size);
+        }
+
+    }
+
+    /**
+     * 判断索引是否合法
+     * @param index 索引
+     */
+    private void rangeCheckForAdd(int index) {
+        if(index>size||index<0)throw new IndexOutOfBoundsException("索引为"+index+",但是当前数组长度为："+size);
+    }
+
+    /**
+     * 判断索引是否合法 ,
+     * @param index 索引
+     */
+    private void rangeCheck(int index) {
+        if(index>=size||index<0)throw new IndexOutOfBoundsException("索引为"+index+",但是当前数组长度为："+size);
+    }
+
+
+    /**
+     * 确保当前数组能够长度能够容纳新的对象，如果不够，就自行增长
+     * @param needLength 需要的数组长度
+     */
+    private void ensureCapacity(int needLength) {
+        if(elementData==emptyObjects){
+            needLength = Math.max(defaultCapacity, needLength);
+        }
+
+        if(needLength-elementData.length>0){
+            this.grow(needLength);
+        }
+    }
+
+    /**
+     * 数组扩容
+     * @param needLength 需要的长度
+     */
+    private void grow(int needLength) {
+        int elementLength=elementData.length;
+        //扩容1.5倍
+        int newLength=elementLength+(elementLength>>1);
+
+        if(needLength-newLength>0){
+            newLength=needLength;
+        }
+        this.elementData= Arrays.copyOf(this.elementData,newLength);
+    }
+
+    private class ArrayListIterator implements Iterator{
+        //游标，当前迭代器执行到何处了
+        private int cursor=0;
+
+        @Override
+        public boolean hasNext() {
+            return cursor!=size;
+        }
+
+        @Override
+        public Object next() {
+            if (cursor >= size)throw new NoSuchElementException();
+            Object[] elementData = ArrayList.this.elementData;
+            return elementData[cursor++];
+        }
+    }
+
+
+
+
+}

group03/1360464792/src/main/java/rui/study/coding2017/BinaryTree.java

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+package rui.study.coding2017;
+
+/**
+ * 二叉树
+ * Created by 赵睿 on 2017/2/25.
+ */
+public class BinaryTree {
+    private BinaryTreeNode root;
+
+    private int size;
+
+    public void insert(Comparable comparable){
+        BinaryTreeNode binaryTreeNode=new BinaryTreeNode(comparable);
+
+        if(this.root==null){
+            this.root=binaryTreeNode;
+        }else {
+            boolean flag=false;
+            BinaryTreeNode cursorNode=root;
+            while(!flag){
+                if(comparable.compareTo(cursorNode.getData())<0){
+                    if(cursorNode.getLeft()==null){
+                        cursorNode.setLeft(binaryTreeNode);
+                        flag=true;
+                    }else{
+                        cursorNode=cursorNode.getLeft();
+                    }
+                }else {
+                    if(cursorNode.getRight()==null){
+                        cursorNode.setRight(binaryTreeNode);
+                        flag=true;
+                    }else{
+                        cursorNode=cursorNode.getRight();
+                    }
+                }
+
+            }
+        }
+        size++;
+    }
+
+    public LinkedList inorder(){
+        LinkedList linkedList=new LinkedList();
+        sortLeft(linkedList,root);
+        sortRight(linkedList,root);
+        return linkedList;
+    }
+
+    private void sortRight(LinkedList linkedList,BinaryTreeNode binaryTreeNode){
+        Queue queue=getRightList(binaryTreeNode);
+        while(!queue.isEmpty()){
+            BinaryTreeNode queueNode = (BinaryTreeNode) queue.deQueue();
+            sortLeft(linkedList,queueNode);
+        }
+
+    }
+
+    private void sortLeft(LinkedList linkedList,BinaryTreeNode binaryTreeNode){
+        Stack stack=getLeftList(binaryTreeNode);
+        while(!stack.isEmpty()) {
+            BinaryTreeNode stackNode = (BinaryTreeNode) stack.pop();
+            linkedList.add(stackNode.getData());
+            Queue queue = getRightList(stackNode);
+            while (!queue.isEmpty()) {
+                BinaryTreeNode queueNode = (BinaryTreeNode) queue.deQueue();
+                sortLeft(linkedList,queueNode);
+            }
+        }
+        linkedList.add(binaryTreeNode.getData());
+    }
+
+
+    private Stack getLeftList(BinaryTreeNode binaryTreeNode){
+        Stack stack=new Stack();
+        while(binaryTreeNode.getLeft()!=null){
+            binaryTreeNode=binaryTreeNode.getLeft();
+            stack.push(binaryTreeNode);
+        }
+        return stack;
+    }
+
+    private Queue getRightList(BinaryTreeNode binaryTreeNode){
+        Queue queue=new Queue();
+        while(binaryTreeNode.getRight()!=null){
+            binaryTreeNode=binaryTreeNode.getRight();
+            queue.enQueue(binaryTreeNode);
+        }
+        return queue;
+    }
+
+
+
+}

group03/1360464792/src/main/java/rui/study/coding2017/BinaryTreeNode.java

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+package rui.study.coding2017;
+
+public class BinaryTreeNode {
+
+    private Comparable data;
+    private BinaryTreeNode left;
+    private BinaryTreeNode right;
+
+    public Comparable getData() {
+        return data;
+    }
+    public void setData(Comparable data) {
+        this.data = data;
+    }
+    public BinaryTreeNode getLeft() {
+        return left;
+    }
+    public void setLeft(BinaryTreeNode left) {
+        this.left = left;
+    }
+    public BinaryTreeNode getRight() {
+        return right;
+    }
+    public void setRight(BinaryTreeNode right) {
+        this.right = right;
+    }
+
+    public BinaryTreeNode() {
+    }
+
+    public BinaryTreeNode(Comparable data) {
+        this.data = data;
+    }
+
+    public BinaryTreeNode(Comparable data, BinaryTreeNode left, BinaryTreeNode right) {
+        this.data = data;
+        this.left = left;
+        this.right = right;
+    }
+}

group03/1360464792/src/main/java/rui/study/coding2017/Iterator.java

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+package rui.study.coding2017;
+
+
+public interface Iterator {
+    public boolean hasNext();
+    public Object next();
+
+}