java - 错误: Type Queue Does Not Take Parameter - What's the difference between Queues and Priority Queues?

Question

我收到错误消息“类型队列不接受参数”。当我将更改队列行替换为 PriorityQueue 时，此错误消失并且编译正常。有什么区别以及如何将其更改为编译队列和常规队列？

import java.util.*;

public class StackOneTwoMultiply {

    public static void main(String[] args) {

        int first, second;

        Stack<Integer> s = new Stack<Integer>();  //stack called s
        PriorityQueue<Integer> q = new PriorityQueue<Integer>();

        for (int i = 10; i > 0; i--) {      //filling the stack (what order to fill was not specifified)
            s.push(i);
        }

        while (!s.isEmpty()) {
            first = s.pop();
            second = s.pop();
            q.offer(first * second);
            System.out.println(q.peek());
        }

        System.out.print(q);
    }
}

Answer 1

如果您想使用队列而不是 PriorityQueue，请创建具有 Queue 接口(interface)的 LinkedList 类的对象。

import java.util.*;
.....
Queue<Integer> q = new LinkedList<Integer>();
.....

如果此后仍不起作用，请尝试使用指定的导入语句:

import java.util.LinkedList;
import java.util.Queue;

有时会出现不接受java.util.*参数的情况

code snippet of error due to java.util.*