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Merge pull request #2 from BlindingDark/master
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第三周作业request
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Lizhny authored Mar 20, 2017
2 parents 6e8c37a + 68c0542 commit 075130d
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Showing 45 changed files with 2,727 additions and 6 deletions.
79 changes: 79 additions & 0 deletions group26/1515345281/src/week1/collection/ArrayList.java
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package week1.collection;

import java.util.Arrays;

public class ArrayList implements List {

private int size=0;

private Object[] elementData=new Object[100];

public void add(Object o){

add(size,o);

}

public void add(int index, Object o){

ListUtils.checkIndexRange(index,size);

if(size == elementData.length){
elementData = Arrays.copyOf(elementData, elementData.length+50);
}

if(index < size){
for(int i=size-1;i>=index;i--){
elementData[i+1]=elementData[i];
}
}
elementData[index] = o;
size++;
}

public Object get(int index){

ListUtils.checkIndexRange(index+1,size);

return elementData[index];
}

public Object remove(int index){

ListUtils.checkIndexRange(index+1,size);

Object object=elementData[index];
for(int i=index;i<size-1;i++){
elementData[i]=elementData[i+1];
}
elementData[size-1]=null; // GC回收
size--;
return object;
}

public int size(){

return size;

}

public Iterator iterator(){

return new Iterator(){

private int cursor=0;

@Override
public boolean hasNext() {
return cursor!=size;
}

@Override
public Object next() {
int i=cursor;
cursor++;
return elementData[i];
}
};
}
}
94 changes: 94 additions & 0 deletions group26/1515345281/src/week1/collection/BinaryTreeNode.java
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package week1.collection;
public class BinaryTreeNode {

private Comparable data;
private BinaryTreeNode left=null;
private BinaryTreeNode right=null;

public BinaryTreeNode(Comparable o){
this.data=o;
}
/*
* 非递归实现
*/
/* public BinaryTreeNode insert(Comparable o){
BinaryTreeNode currentNode=this;
while(null != currentNode){
Comparable data=(Comparable) currentNode.getData();
int result=data.compareTo((Integer) o);
if(result == 0){
return currentNode;
}else if(result > 0){
if(null == currentNode.getLeft()){
BinaryTreeNode insertNode=new BinaryTreeNode(o);
currentNode.setLeft(insertNode);
return insertNode;
}
currentNode=currentNode.left;
}else{
if(null ==currentNode.right){
BinaryTreeNode insertNode=new BinaryTreeNode(o);
currentNode.setRight(insertNode);
return insertNode;
}
currentNode=currentNode.right;
}
}
return new BinaryTreeNode(o);
}*/

/*
* 递归实现
*/
public BinaryTreeNode insert(Comparable o){

Comparable data=(Comparable) this.getData();
int result=data.compareTo(o);

if(result == 0){
return this;
}else if(result > 0){
if(this.getLeft()==null){
BinaryTreeNode node=new BinaryTreeNode(o);
this.setLeft(node);
return node;
}
return this.getLeft().insert(o);
}else{
if(this.getRight()==null){
BinaryTreeNode node=new BinaryTreeNode(o);
this.setRight(node);
return node;
}
return this.getRight().insert(o);
}
}

public Object 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;
}

}
5 changes: 5 additions & 0 deletions group26/1515345281/src/week1/collection/Iterator.java
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package week1.collection;
public interface Iterator{
public boolean hasNext();
public Object next();
}
214 changes: 214 additions & 0 deletions group26/1515345281/src/week1/collection/LinkedList.java
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package week1.collection;

/*
* 要求:单向链表实现
*/
public class LinkedList implements List {

private int size=0;//表示该链表的长度
private Node head;//链表的头元素

public void add(Object o){
if(null == head){
head = new Node(o);
size++;
return ;
}

Node node=head;
while(null != node.next){
node=node.next;
}
Node addNode=new Node(o);
node.next=addNode;
size++;
}

public void add(int index , Object o){
if(size == 0 || index ==size){
add(o);
return ;
}

ListUtils.checkIndexRange(index, size);

if(index==0){
Node node=new Node(head.next.data);
node.next=head.next;
head.next=node;
head.data=o;
size++;
return ;
}

Node node=head;
for(int i=0;i<index-1;i++){
node=node.next;
}

Node addNode=new Node(o);
addNode.next=node.next;
node.next=addNode;
size++;
}

public Object get(int index){

ListUtils.checkIndexRange(index, size-1);

Node node=head;
for(int i=0;i<index;i++){
node=node.next;
}
return node.data;
}

public Object remove(int index){

ListUtils.checkIndexRange(index, size-1);

if(index == 0){
Node removeNode=head;
head=head.next;
size--;
return removeNode.data;
}

Node node=head;
for(int i=0;i<index-1;i++){
node=node.next;
}
Node removeNode=node.next;
node.next=removeNode.next;
size--;
return removeNode.data;
}

public int size(){
return size;
}

public void addFirst(Object o){
add(0,o);
}

public void addLast(Object o){
add(size,o);
}

public Object removeFirst(){
return remove(0);
}

public Object removeLast(){
return remove(size-1);
}

public Iterator iterator(){
return new Iterator(){

int cursor=0;
Node node=head;

@Override
public boolean hasNext() {

return cursor!=size;
}

@Override
public Object next() {

Node currentNode=node;
node=node.next;
cursor++;
return currentNode.data;
}
};
}

private static class Node{
Object data;
Node next=null;
public Node(Object data){
this.data=data;
}
}

//以下不用实现
/**
* 把该链表逆置
* 例如链表为 3->7->10 , 逆置后变为 10->7->3
*/
public void reverse(){

}

/**
* 删除一个单链表的前半部分
* 例如:list = 2->5->7->8 , 删除以后的值为 7->8
* 如果list = 2->5->7->8->10 ,删除以后的值为7,8,10
*/
public void removeFirstHalf(){

}

/**
* 从第i个元素开始, 删除length 个元素 , 注意i从0开始
* @param i
* @param length
*/
public void remove(int i, int length){

}
/**
* 假定当前链表和listB均包含已升序排列的整数
* 从当前链表中取出那些listB所指定的元素
* 例如当前链表 = 11->101->201->301->401->501->601->701
* listB = 1->3->4->6
* 返回的结果应该是[101,301,401,601]
* @param list
*/
public int[] getElements(LinkedList list){
return null;
}

/**
* 已知链表中的元素以值递增有序排列,并以单链表作存储结构。
* 从当前链表中中删除在listB中出现的元素
* @param list
*/

public void subtract(LinkedList list){

}

/**
* 已知当前链表中的元素以值递增有序排列,并以单链表作存储结构。
* 删除表中所有值相同的多余元素(使得操作后的线性表中所有元素的值均不相同)
*/
public void removeDuplicateValues(){

}

/**
* 已知链表中的元素以值递增有序排列,并以单链表作存储结构。
* 试写一高效的算法,删除表中所有值大于min且小于max的元素(若表中存在这样的元素)
* @param min
* @param max
*/
public void removeRange(int min, int max){

}

/**
* 假设当前链表和参数list指定的链表均以元素依值递增有序排列(同一表中的元素值各不相同)
* 现要求生成新链表C,其元素为当前链表和list中元素的交集,且表C中的元素有依值递增有序排列
* @param list
*/
public LinkedList intersection( LinkedList list){
return null;
}
}
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