如何实现每个节点都是一个类的堆？
我想创建一个堆结构，每个节点有 2 个数据，1) string 2) int 所以我认为每个节点必须是一个名称为“heapNode”的类，但我在交换方法中遇到麻烦， 请帮助我
import java.util.ArrayList;
public class MainHeap {
ArrayList<heapNode> heap;
MainHeap (){
new ArrayList<heapNode>();
}
public int getMin(){
return heap.get(0).data ;
}
private int parent(int pos) {
return pos / 2;
}
private void swap(int pos1, int pos2) {
heapNode temp =new heapNode();
temp = heap.get(pos1);
heap.get(pos1) = heap.get(pos2);
heap.get(pos2) = temp;
}
public void insert(int elem) {
int max = heap.size();
heap.get(max).data = elem ;
int current = heap.size() ;
while (heap.get(current).data < heap.get(parent(current)).data){
swap ( current , parent(current));
}
}
}
，这是我的 heapNode 类，
public class heapNode {
int data;
String fileName;
}
交换方法有错误，但我无法解决错误
I want to crate a Heap structure that each node have 2 data , 1) string 2) int
so i think that each node must be a Class that's name is "heapNode" , but i have a trouble in swap method ,
please help me
import java.util.ArrayList;
public class MainHeap {
ArrayList<heapNode> heap;
MainHeap (){
new ArrayList<heapNode>();
}
public int getMin(){
return heap.get(0).data ;
}
private int parent(int pos) {
return pos / 2;
}
private void swap(int pos1, int pos2) {
heapNode temp =new heapNode();
temp = heap.get(pos1);
heap.get(pos1) = heap.get(pos2);
heap.get(pos2) = temp;
}
public void insert(int elem) {
int max = heap.size();
heap.get(max).data = elem ;
int current = heap.size() ;
while (heap.get(current).data < heap.get(parent(current)).data){
swap ( current , parent(current));
}
}
}
and this is my heapNode class
public class heapNode {
int data;
String fileName;
}
the swap method has error but i cant solve errors
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评论（2）
您的交换代码实际上使对象指向不同的对象。它不会修改数组列表本身的位置。如果使用 arraylist，您必须从索引中删除一个对象并将该对象设置在新索引处以进行交换，否则您可以使用其他数据结构。
Your swap code actually makes the objects point to different objects. It does not modify the positions in the arraylist itself. If using arraylist, you will have to remove an object from an index and set that object at a new index to swap or else you can use other data structure.
java.util.PriorityQueuejava.util.PriorityQueue<YourClass>