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我已经发布了这个代码几次我很抱歉，如果你一直在看这个问题。我一直在这方面做了一些工作，所以任何帮助都会有所帮助，我尽可能地做到了这一点。但是当我的程序打印数据时，它将8和7切换，我找不到原因！这里是所有的代码。而且我还没有开始制作我的删除方法，所以忽略了这个功能。Java双链表打印
public class MyLinkedList<AnyType> implements Iterable<AnyType> {
private int theSize;
private Node<AnyType> beginMarker;
private Node<AnyType> endMarker;
public class Node<AnyType> {
public Node(AnyType data, Node<AnyType> head, Node<AnyType> tail) {
myData = data;
myHead = head;
myTail = tail;
}
public AnyType myData;
public Node<AnyType> myHead;
public Node<AnyType> myTail;
}
public MyLinkedList() {
beginMarker = new Node(null, endMarker, null);
endMarker = new Node(null, null, beginMarker);
theSize = 0;
}
public void clear() {
beginMarker.myHead = endMarker;
endMarker.myTail = beginMarker;
}
public int size() {
return theSize;
}
public boolean exist(AnyType newVal) {
beginMarker.myHead.myData = newVal;
if (newVal != null) {
return true;
}
return false;
}
private void addBefore(Node<AnyType> previousNode, AnyType newNode) {
Node<AnyType> new_node = new Node<>(newNode, previousNode.myTail, previousNode);
new_node.myTail.myHead = new_node;
previousNode.myTail = new_node;
theSize++;
}
public boolean add(AnyType newVal) {
{
add(size(), newVal);
return true;
}
}
public boolean add(int index, AnyType newVal) {
addBefore(getNode(index, 0, size()), newVal);
return true;
}
private Node<AnyType> getNode(int index) {
return getNode(index, 0, size() - 1);
}
public Node<AnyType> get(AnyType nodeData) {
Node<AnyType> node = beginMarker;
while (node != endMarker) {
// Means node.data = nodeData
if (node.myData.equals(nodeData)) {
return node;
}
}
return null;
}
// Added method
private Node<AnyType> getNode(int index, int lower, int upper) {
Node<AnyType> x;
if (index < lower || index > upper)
throw new IndexOutOfBoundsException();
if (index < size()/2) {
x = beginMarker.myHead;
for (int i = 0; i < index; i++)
x = x.myHead;
} else {
x = endMarker.myTail;
for (int i = size(); i > index; i--) {
x = x.myTail;
}
}
return x;
}
public void printList() {
Node temp = beginMarker.myHead;
while (temp != null) {
System.out.println(temp.myData);
temp = temp.myHead;
}
}
public java.util.Iterator<AnyType> iterator() {
return new LinkedListIterator();
}
public void remove(AnyType removeVal) {
/*
* if(node.myData.equals(nodeData))
*
* MyLinkedList testList = new MyLinkedList();
*
* Node temp = testList.beginMarker.myData; while(temp != null){
*
* if(temp == removeVal){ temp.myTail = temp.myHead; temp.myHead =
* temp.myTail; } else{ temp.myHead = temp; }
*
*
* }
*/
}
private class LinkedListIterator implements java.util.Iterator<AnyType> {
private Node<AnyType> node_ = beginMarker;
public void remove() {
}
public boolean hasNext() {
if (node_.myHead != null) {
return true;
}
return false;
}
public AnyType next() {
if (!hasNext()) {
return null;
}
node_ = node_.myHead;
return node_.myData;
}
}
private static void testListIntegers() {
MyLinkedList<Integer> testList = new MyLinkedList<Integer>();
testList.add(new Integer(5));
testList.add(new Integer(4));
testList.add(new Integer(3));
System.out.println(" We have so far inserted " + testList.size() + " elements in the list");
testList.remove(4);
System.out.println(" Now, there is only " + testList.size() + " elements left in the list");
testList.add(1, new Integer(7));
testList.add(2, new Integer(8));
System.out.println(" About to print content of the list");
testList.printList();
}
private static void testListStrings() {
MyLinkedList<String> testList = new MyLinkedList<String>();
testList.add(new String("hello"));
testList.add(new String("this is"));
testList.add(new String("cs3345 project 2"));
System.out.println(" We have so far inserted " + testList.size() + " elements in the list");
testList.remove("this is");
System.out.println(" Now, there is only " + testList.size() + " elements left in the list");
testList.add(1, "a modified version of");
testList.add(2, "cs3345 project 2, call it version 2");
System.out.println(" About to print content of the list");
testList.printList();
}
public static void main(String args[]) throws Exception {
// Add whatever code you need here
// However, you will need to call both testListIntegers()
// and testListStrings()
testListIntegers();
testListStrings();
}
}
输出如下：
We have so far inserted 3 elements in the list
Now, there is only 3 elements left in the list
About to print content of the list
8
7
3
4
5
We have so far inserted 3 elements in the list
Now, there is only 3 elements left in the list
About to print content of the list
cs3345 project 2, call it version 2
a modified version of
cs3345 project 2
this is
hello
什么是AnyType类？ – pczeus
它没有类，因为我的LinkedList正在使用相同的代码取整数和字符串。我们的教授通过哈哈的方式给了我们这个代码（我讨厌它的结构）。我希望能回答你的问题。 –
@ErikNyström，add函数使用1处的索引来添加7.所以它将8和7混合在一起。它让我疯狂起来，因为我已经逐字地遍历了我的代码，并且一切都在逻辑上合理。 –