JavaPriorityQueue任务优先级管理技巧

class Task implements Comparable<Task> {
    private String name;
    private int priority;

    public Task(String name, int priority) {
        this.name = name;
        this.priority = priority;
    }

    public String getName() {
        return name;
    }

    public int getPriority() {
        return priority;
    }

    @Override
    public int compareTo(Task other) {
        return Integer.compare(this.priority, other.priority); // 优先级数值小的排前面
    }

    @Override
    public String toString() {
        return "Task{name='" + name + "', priority=" + priority + '}';
    }
}

import java.util.PriorityQueue;

public class TaskScheduler {
    public static void main(String[] args) {
        PriorityQueue<Task> taskQueue = new PriorityQueue<>();

        taskQueue.offer(new Task("发送邮件", 3));
        taskQueue.offer(new Task("保存日志", 2));
        taskQueue.offer(new Task("系统重启", 1));
        taskQueue.offer(new Task("数据备份", 4));

        while (!taskQueue.isEmpty()) {
            System.out.println("执行任务: " + taskQueue.poll());
        }
    }
}

执行任务: Task{name='系统重启', priority=1}
执行任务: Task{name='保存日志', priority=2}
执行任务: Task{name='发送邮件', priority=3}
执行任务: Task{name='数据备份', priority=4}

PriorityQueue<Task> taskQueue = new PriorityQueue<>((t1, t2) -> 
    Integer.compare(t2.getPriority(), t1.getPriority())
);