PriorityQueue命令不正确JAVA

Question

我有一个User实现Comparable 的类.在我添加用户列表后,PriorityQueue<User>他们应该优先考虑scores,但由于某种原因他们没有.你可以帮我弄清楚为什么用户没有在我的分类Queue？

更新:

我通过轮询元素访问队列.prioritisedUsers.poll()它总是带有顺序尊重的随机分数.

PriorityQueue<User> prioritisedUsers = userPriorityStrategy.computeUserPriority(users);

while(!prioritisedUsers.isEmpty()){
    System.out.println(prioritisedUsers.poll().getPriorityScore());
}

OUTPUT:

0.35036433736768735
0.6619121139678329
0.09520067929838127
0.4013591573863
0.6704568389588227
0.5989900926939181
0.7320779721160738

谢谢你的帮助!

public class User implements Comparable<User>{

    private long id;
    private String fistName;
    private String lastName;
    private double priorityScore;

    public User (long id, String firstName, String lastName){
        this.id = id;
        this.fistName = firstName;
        this.lastName = lastName;
    }

    public double getPriorityScore(){
        return this.priorityScore;
    }

    public void setPriorityScore(double priorityScore){
        this.priorityScore = priorityScore;
    }

    public long getId(){
        return this.id;
    }

    public String getFistName(){
        return this.fistName;
    }

    public String getLastName(){
        return this.lastName;
    }

    public int compareTo(User o) {
        return (int) (this.getPriorityScore() - o.getPriorityScore());
    }
}


    public PriorityQueue<User> computeUserPriority(List<User> users) {
        PriorityQueue<User> prioritisedUsers = new PriorityQueue<User>(users.size());
        for (User user : users) {
            user.setPriorityScore(rand.nextDouble());
            prioritisedUsers.add(user);
        }
        return prioritisedUsers;
    }

Answer 1

我不太确定你的转换为(int)效果很好......因为转换为int会隐式丢弃任何小数.

如果我没有错,试试类似的东西

public int compareTo(User object) {
if (this.getPriorityScore() < object.getPriorityScore())
    return -1;
if (this.getPriorityScore() == object.getPriorityScore())
    return 0;
return 1;
}

或者更简单地说:

public int compareTo(User o) {
    return Double.compare(this.getPriorityScore(), o.getPriorityScore());
}