我正在尝试为一个模拟杂货市场篮子的作业创建一个链表,其中篮子是链表,其中的节点(链接)是每个产品。下面的代码代表购物篮(LinkedList)和一些产品 Gouda 和 Bacon。我的问题是如何从这两个节点创建一个链表,以便我可以获得像 Gouda->Bacon->Bacon->Gouda 等 LinkedList?
提前谢谢你
public class Test {
public static void main(String[] args) {
LinkedList theLinkedList = new LinkedList();
theLinkedList.insertFirstLink();
theLinkedList.display();
}
}
class LinkedList{
// Reference to first Link in list
// The last Link added to the LinkedList
public Gouda firstLink;
LinkedList(){
// Here to show the first Link always starts as null
firstLink = null;
}
// Returns true if LinkList is empty
public boolean isEmpty(){
return(firstLink == null);
}
public void insertFirstLink(){
Gouda newLink = new Gouda();
// Connects the firstLink field to the new Link
newLink.next = firstLink;
firstLink = newLink;
}
public void display(){
Gouda theLink = firstLink;
// Start at the reference stored in firstLink and
// keep getting the references stored in next for
// every Link until next returns null
while(theLink != null){
theLink.display();
System.out.println("Next Link: " + theLink.next);
theLink = theLink.next;
System.out.println();
}
}
}
public class Gouda{
// Set to public so getters & setters aren't needed
public String category= "Dairy";
public String productName = "Gouda Cheese";
public double price = 57.50;
// Reference to next link made in the LinkList
// Holds the reference to the Link that was created before it
// Set to null until it is connected to other links
public Gouda next;
public void display(){
System.out.println(category+" :"+ productName +""+ price);
}
}
public class Bacon{
// Set to public so getters & setters aren't needed
public String category= "Meat";
public String productName = "Thick cut Bacon";
public double price = 5.50;
// Reference to next link made in the LinkList
// Holds the reference to the Link that was created before it
// Set to null until it is connected to other links
public Bacon next;
public void display(){
System.out.println(category+" :"+ productName +""+ price);
}
}
最佳答案
您应该定义一个新类,例如 Product
,并将 Gouda
和 Bacon
定义为其子类。
然后在链接列表中将firstLink定义为:
public Product firstLink;
并始终在LinkedList
类中使用Product。通过这种方式,您可以在列表中插入 Goude
和 Bacon
的两个实例,因为它们是 Product
。
这就是子类和继承的基本思想。
关于java - 来自不同类节点的链表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37064589/