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Merge pull request #2 from BlindingDark/master
第三周作业request
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package week1.collection; | ||
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import java.util.Arrays; | ||
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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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add(size,o); | ||
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} | ||
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public void add(int index, Object o){ | ||
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ListUtils.checkIndexRange(index,size); | ||
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if(size == elementData.length){ | ||
elementData = Arrays.copyOf(elementData, elementData.length+50); | ||
} | ||
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if(index < size){ | ||
for(int i=size-1;i>=index;i--){ | ||
elementData[i+1]=elementData[i]; | ||
} | ||
} | ||
elementData[index] = o; | ||
size++; | ||
} | ||
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public Object get(int index){ | ||
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ListUtils.checkIndexRange(index+1,size); | ||
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return elementData[index]; | ||
} | ||
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public Object remove(int index){ | ||
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ListUtils.checkIndexRange(index+1,size); | ||
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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; | ||
} | ||
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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 Iterator(){ | ||
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private int cursor=0; | ||
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@Override | ||
public boolean hasNext() { | ||
return cursor!=size; | ||
} | ||
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@Override | ||
public Object next() { | ||
int i=cursor; | ||
cursor++; | ||
return elementData[i]; | ||
} | ||
}; | ||
} | ||
} |
94 changes: 94 additions & 0 deletions
94
group26/1515345281/src/week1/collection/BinaryTreeNode.java
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package week1.collection; | ||
public class BinaryTreeNode { | ||
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private Comparable data; | ||
private BinaryTreeNode left=null; | ||
private BinaryTreeNode right=null; | ||
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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); | ||
}*/ | ||
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/* | ||
* 递归实现 | ||
*/ | ||
public BinaryTreeNode insert(Comparable o){ | ||
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Comparable data=(Comparable) this.getData(); | ||
int result=data.compareTo(o); | ||
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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); | ||
} | ||
} | ||
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public Object getData() { | ||
return data; | ||
} | ||
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public void setData(Comparable data) { | ||
this.data = data; | ||
} | ||
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public BinaryTreeNode getLeft() { | ||
return left; | ||
} | ||
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public void setLeft(BinaryTreeNode left) { | ||
this.left = left; | ||
} | ||
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public BinaryTreeNode getRight() { | ||
return right; | ||
} | ||
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public void setRight(BinaryTreeNode right) { | ||
this.right = right; | ||
} | ||
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} |
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Original file line number | Diff line number | Diff line change |
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package week1.collection; | ||
public interface Iterator{ | ||
public boolean hasNext(); | ||
public Object next(); | ||
} |
214 changes: 214 additions & 0 deletions
214
group26/1515345281/src/week1/collection/LinkedList.java
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package week1.collection; | ||
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/* | ||
* 要求:单向链表实现 | ||
*/ | ||
public class LinkedList implements List { | ||
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private int size=0;//表示该链表的长度 | ||
private Node head;//链表的头元素 | ||
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public void add(Object o){ | ||
if(null == head){ | ||
head = new Node(o); | ||
size++; | ||
return ; | ||
} | ||
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Node node=head; | ||
while(null != node.next){ | ||
node=node.next; | ||
} | ||
Node addNode=new Node(o); | ||
node.next=addNode; | ||
size++; | ||
} | ||
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public void add(int index , Object o){ | ||
if(size == 0 || index ==size){ | ||
add(o); | ||
return ; | ||
} | ||
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ListUtils.checkIndexRange(index, size); | ||
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if(index==0){ | ||
Node node=new Node(head.next.data); | ||
node.next=head.next; | ||
head.next=node; | ||
head.data=o; | ||
size++; | ||
return ; | ||
} | ||
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Node node=head; | ||
for(int i=0;i<index-1;i++){ | ||
node=node.next; | ||
} | ||
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Node addNode=new Node(o); | ||
addNode.next=node.next; | ||
node.next=addNode; | ||
size++; | ||
} | ||
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public Object get(int index){ | ||
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ListUtils.checkIndexRange(index, size-1); | ||
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Node node=head; | ||
for(int i=0;i<index;i++){ | ||
node=node.next; | ||
} | ||
return node.data; | ||
} | ||
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public Object remove(int index){ | ||
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ListUtils.checkIndexRange(index, size-1); | ||
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if(index == 0){ | ||
Node removeNode=head; | ||
head=head.next; | ||
size--; | ||
return removeNode.data; | ||
} | ||
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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; | ||
} | ||
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public int size(){ | ||
return size; | ||
} | ||
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public void addFirst(Object o){ | ||
add(0,o); | ||
} | ||
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public void addLast(Object o){ | ||
add(size,o); | ||
} | ||
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public Object removeFirst(){ | ||
return remove(0); | ||
} | ||
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public Object removeLast(){ | ||
return remove(size-1); | ||
} | ||
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public Iterator iterator(){ | ||
return new Iterator(){ | ||
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int cursor=0; | ||
Node node=head; | ||
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@Override | ||
public boolean hasNext() { | ||
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return cursor!=size; | ||
} | ||
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@Override | ||
public Object next() { | ||
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Node currentNode=node; | ||
node=node.next; | ||
cursor++; | ||
return currentNode.data; | ||
} | ||
}; | ||
} | ||
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private static class Node{ | ||
Object data; | ||
Node next=null; | ||
public Node(Object data){ | ||
this.data=data; | ||
} | ||
} | ||
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//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(){ | ||
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} | ||
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/** | ||
* 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(){ | ||
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} | ||
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/** | ||
* 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){ | ||
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} | ||
/** | ||
* 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; | ||
} | ||
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/** | ||
* 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 | ||
*/ | ||
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public void subtract(LinkedList list){ | ||
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} | ||
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/** | ||
* 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(){ | ||
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} | ||
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/** | ||
* 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){ | ||
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} | ||
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/** | ||
* 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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