java并发编程工具类PriorityBlockingQueue优先级队列

public class Employee implements Comparable<Employee> {
    private Long id;
    private String name;
    private LocalDate dob;
    //Getters and setters
    public Employee(Long id, String name, LocalDate dob) {
        super();
        this.id = id;
        this.name = name;
        this.dob = dob;
    }
    @Override
    public int compareTo(Employee emp) {
        return this.getId().compareTo(emp.getId());  //根据id排序
    }
    @Override
    public String toString() {
        return "Employee [id=" + id + ", name=" + name + ", dob=" + dob + "]";
    }
}

PriorityBlockingQueue<Employee> priorityBlockingQueue = new PriorityBlockingQueue<>();
priorityBlockingQueue.add(new Employee(1l, "AAA", LocalDate.now()));
priorityBlockingQueue.add(new Employee(4l, "CCC", LocalDate.now()));
priorityBlockingQueue.add(new Employee(5l, "BBB", LocalDate.now()));
priorityBlockingQueue.add(new Employee(2l, "FFF", LocalDate.now()));
priorityBlockingQueue.add(new Employee(3l, "DDD", LocalDate.now()));
priorityBlockingQueue.add(new Employee(6l, "EEE", LocalDate.now()));
while(true) {
  Employee e = priorityBlockingQueue.poll();
  System.out.println(e);

  if(e == null) break;
}

Employee [id=1, name=AAA, dob=2021-03-25]
Employee [id=2, name=FFF, dob=2021-03-25]
Employee [id=3, name=DDD, dob=2021-03-25]
Employee [id=4, name=CCC, dob=2021-03-25]
Employee [id=5, name=BBB, dob=2021-03-25]
Employee [id=6, name=EEE, dob=2021-03-25]

//以员工名称的字符串自然正序进行排序
Comparator<Employee> nameSorter = Comparator.comparing(Employee::getName);
PriorityBlockingQueue<Employee> priorityBlockingQueue = new PriorityBlockingQueue<>( 11, nameSorter );
//此处省略向队列中添加对象，及循环取出对象打印的代码，参考上文

Employee [id=1, name=AAA, dob=2021-03-25]
Employee [id=5, name=BBB, dob=2021-03-25]
Employee [id=4, name=CCC, dob=2021-03-25]
Employee [id=3, name=DDD, dob=2021-03-25]
Employee [id=6, name=EEE, dob=2021-03-25]
Employee [id=2, name=FFF, dob=2021-03-25]