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数据结构代码提交
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7 files changed

+324
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‎group15/1514_616019420/ArrayList.java

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package com.coding.basic;
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public class ArrayList implements List {
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private int size = 0;
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private Object[] elementData = new Object[100];
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public void add(Object o) {
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elementData[size] = o;
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size++;
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}
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public void add(int index, Object o) {
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for (int i = size; i > index; i--) {
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elementData[i] = elementData[i - 1];
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}
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elementData[index] = o;
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}
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public Object get(int index) {
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return elementData[index];
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}
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public Object remove(int index) {
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Object oj = elementData[index];
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for (int i = index; i < size; i++) {
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elementData[i] = elementData[i + 1];
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}
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elementData[size--] = null;
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return oj;
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}
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public int size() {
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return size;
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}
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public Iterator iterator() {
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return new MyIterator();
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}
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public class MyIterator implements Iterator {
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int i = 0;
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@Override
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public boolean hasNext() {
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while (elementData[i] != null) {
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return true;
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}
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return false;
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}
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@Override
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public Object next() {
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return elementData[i++];
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}
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}
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public static void main(String[] args) {
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ArrayList a = new ArrayList();
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a.add(1);
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a.add(2);
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a.add(3);
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MyIterator b = (MyIterator) a.iterator();
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while(b.hasNext()){
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System.out.println(b.next());
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}
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}
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}

‎group15/1514_616019420/BinaryTreeNode.java

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package com.coding.basic;
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public class BinaryTreeNode {
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private Object data;
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private BinaryTreeNode left;
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private BinaryTreeNode right;
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public Object getData() {
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return data;
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}
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public void setData(Object data) {
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this.data = data;
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}
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public BinaryTreeNode getLeft() {
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return left;
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}
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public void setLeft(BinaryTreeNode left) {
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this.left = left;
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}
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public BinaryTreeNode getRight() {
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return right;
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}
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public void setRight(BinaryTreeNode right) {
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this.right = right;
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}
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public BinaryTreeNode insert(Object o) {
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BinaryTreeNode node = new BinaryTreeNode();
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if (left == null && right != null) {
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right = node;
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} else if (right == null & left != null) {
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left = node;
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} else {
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return null;
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}
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return node;
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}
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}

‎group15/1514_616019420/Iterator.java

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package com.coding.basic;
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public interface Iterator {
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public boolean hasNext();
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public Object next();
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}

‎group15/1514_616019420/LinkedList.java

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package com.coding.basic;
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public class LinkedList implements List {
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private Node head;
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private int size;
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public void add(Object o) {
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Node n = new Node();
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n.data = o;
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if (head != null) {
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n.next = head;
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size++;
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} else {
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size = 1;
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}
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head = n;
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}
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public void add(int index, Object o) {
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Node n1 = head;
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Node n2 = new Node();
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for (int i = size - 1; i >= index; i--) {
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if (i == index) {
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n2.next = n1.next;
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n2.data = 0;
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n1.next = n2;
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} else {
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n1 = n1.next;
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}
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}
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size++;
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}
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public Object get(int index) {
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Node n1 = head;
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Object o = null;
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for (int i = size - 1; i >= index; i--) {
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n1 = n1.next;
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if (i == index) {
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o = n1.data;
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}
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}
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return o;
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}
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public Object remove(int index) {
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Node n1 = head;
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Node n2 = new Node();
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Node n3 = new Node();
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Object o = null;
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for (int i = size - 1; i >= index; i--) {
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if (i == index + 1) {
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n2 = n1.next;
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} else if (i == index) {
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n3 = n2.next;
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o = n3.data;
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n1 = n3.next;
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} else {
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n1 = n1.next;
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}
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}
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n2.next = n1;
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size--;
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return o;
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}
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public int size() {
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return size;
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}
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public void addFirst(Object o) {
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Node n=new Node();
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Node n1=head;
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for(int i=size-1;i>=0;i--)
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{
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n1=n1.next;
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if(i==0){
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n=n1.next;
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n.data=o;
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}
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}
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}
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public void addLast(Object o) {
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Node n=new Node();
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n.data=o;
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n.next=head;
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head=n;
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}
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public Object removeFirst() {
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Object o= new Object();
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Node n1=head;
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for(int i=size-1;i>=0;i--)
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{
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n1=n1.next;
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if(i==1){
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o=n1.next.data;
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n1.next=null;
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}
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}
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return o;
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}
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public Object removeLast() {
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Object o= new Object();
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Node n=head;
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head=n.next;
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o=n.data;
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n.next=null;
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return o;
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}
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public Iterator iterator() {
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return null;
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}
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private static class Node {
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Object data;
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Node next;
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}
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}

‎group15/1514_616019420/List.java

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package com.coding.basic;
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public interface List {
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public void add(Object o);
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public void add(int index, Object o);
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public Object get(int index);
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public Object remove(int index);
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public int size();
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}

‎group15/1514_616019420/Queue.java

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package com.coding.basic;
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public class Queue {
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private LinkedList list =new LinkedList();
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public void enQueue(Object o){
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list.addFirst(o);
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}
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public Object deQueue(){
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return list.removeLast();
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}
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public boolean isEmpty(){
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return list.size()==0;
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}
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public int size(){
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return list.size();
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}
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}

‎group15/1514_616019420/Stack.java

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package com.coding.basic;
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public class Stack {
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private ArrayList elementData = new ArrayList();
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public void push(Object o){
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elementData.add(o);
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}
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public Object pop(){
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return elementData.remove(elementData.size()-1);
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}
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public Object peek(){
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return elementData.get(elementData.size()-1);
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}
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public boolean isEmpty(){
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return elementData.size()==0;
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}
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public int size(){
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return elementData.size();
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}
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}

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