This is my first week's work.

group24/1054283210/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

group24/1054283210/.gitignore

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+/bin/

group24/1054283210/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>1054283210Learning</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

group24/1054283210/src/com/github/xiaozi123/coding2017/basic/.gitignore

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+*.class
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+#ide config
+.metadata
+.recommenders
+.idea/
+*.iml
+rebel.*
+.rebel.*
+
+# Idea
+*.iml
+*.ipr
+*.iws
+.idea
+
+target

group24/1054283210/src/com/github/xiaozi123/coding2017/basic/ArrayList.java

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+package com.github.xiaozi123.coding2017.basic;
+
+import java.util.Arrays;
+
+import org.omg.CORBA.PUBLIC_MEMBER;
+
+public class ArrayList implements List {
+
+	private int size = 0;
+
+	private Object[] elementData = new Object[100];
+
+	public void add(Object o){
+		if(size>=elementData.length){//���û���ڴ� ��ȡ�����ڴ� 
+			elementData=Arrays.copyOf(elementData,size+1);
+		}
+			elementData[size]=o;
+			size++;
+	}
+	public void add(int index, Object o){
+		if(index<0||index>=elementData.length){
+			throw new ArrayIndexOutOfBoundsException("OutOfBound");
+		}
+
+		if(size>=elementData.length){//���û���ڴ� ��ȡ�����ڴ� 
+			elementData=Arrays.copyOf(elementData, size+1);
+		}
+			System.arraycopy(elementData, index, elementData, index+1, elementData.length-index-1);
+			elementData[index]=o;
+			size++;
+	}
+
+	public Object get(int index){
+		if(index<0||index>=elementData.length){
+			throw new ArrayIndexOutOfBoundsException("OutOfBound");
+		}
+		return elementData[index];
+	}
+
+	public Object remove(int index){
+		if(index<0||index>=elementData.length){
+			throw new ArrayIndexOutOfBoundsException("OutOfBound");
+		}
+		Object temp=elementData[index];
+		System.arraycopy(elementData, index+1, elementData, index, elementData.length-index-1);
+		size--;
+		return temp;
+	}
+
+	/*
+	 * (non-Javadoc)��ȡĿǰ����
+	 * @see com.github.xiaozi123.coding2017.basic.List#size()
+	 */
+	public int size(){
+		if(size>=elementData.length){//���û���ڴ� ��ȡ�����ڴ� 
+			elementData=Arrays.copyOf(elementData,size+1);
+		}
+		return size;
+	}
+
+	// next() hasnext()����
+	public Iterator iterator(){
+		return new Iterator(){
+			private int index = 0;
+			public Object next(){
+				return elementData[index++];
+			}
+			public boolean hasNext(){
+				return index >= size;
+			}
+		};
+	}
+
+	public static void main(String[] args) {
+		ArrayList arrayList=new ArrayList();
+
+		arrayList.add(0);
+		arrayList.add(1);
+		arrayList.add(2);
+		System.out.println("���ݸ���Ϊ3��"+(arrayList.size==3));
+
+		System.out.print("����Ӧ��Ϊ0,1,2:   ");
+		for (int i = 0; i < arrayList.size(); i++) {
+			System.out.print(arrayList.get(i)+" ");
+		}
+		System.out.println();
+
+		arrayList.add(1,1);
+		System.out.print("����Ӧ��Ϊ��0,1,1,2:   ");
+		for (int i = 0; i < arrayList.size(); i++) {
+			System.out.print(arrayList.get(i)+" ");
+		}
+		System.out.println();
+
+		System.out.print("����Ӧ��Ϊ0:  ");
+		System.out.println(arrayList.remove(0));
+
+
+	}
+
+
+}
+

group24/1054283210/src/com/github/xiaozi123/coding2017/basic/BinaryTreeNode.java

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+package com.github.xiaozi123.coding2017.basic;
+
+public class BinaryTreeNode {
+
+	private Object data;
+	private BinaryTreeNode left;
+	private BinaryTreeNode right;
+
+	public Object getData() {
+		return data;
+	}
+	public void setData(Object 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 insert(Object o){
+		if (data==null) {
+			this.setData(0);
+		}
+		if ((Integer)o<=(Integer)data) {
+			if (left==null) {
+				left=new BinaryTreeNode();
+				left.setData(o);
+				return left;
+			}
+			return left.insert(o);
+		}else{
+			if (right==null) {
+				right=new BinaryTreeNode();
+				right.setData(o);
+				return right;
+			}
+			return right.insert(o);
+
+		}		
+	}
+	@Override
+	public String toString() {
+		// TODO Auto-generated method stub
+		return data+" "+left+" "+right;
+	}
+
+	public static void main(String[] args) {
+		BinaryTreeNode binaryTreeNode=new BinaryTreeNode();
+		for (int i = 0; i < 5; i++) {
+			binaryTreeNode.insert(i);
+		}
+		System.out.println(binaryTreeNode);
+	}
+
+//			 0
+//		0		 1
+//	null null null	2	
+//				null   3
+//				  null 	 4
+//					  null	null
+
+
+
+}

group24/1054283210/src/com/github/xiaozi123/coding2017/basic/Iterator.java

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+package com.github.xiaozi123.coding2017.basic;
+
+public interface Iterator {
+	public boolean hasNext();
+	public Object next();
+
+}