import java.util.Comparator;
import java.util.PriorityQueue;
import java.util.Queue;
public class Main {
public static void main(String[] args) {
Queue<User> q = new PriorityQueue<>(new UserComparator());
// 添加3个元素到队列:
q.offer(new User("Bob", "A1"));
q.offer(new User("Alice", "A2"));
q.offer(new User("Boss", "V1"));
q.offer(new User("Ben", "A11"));
System.out.println(q.poll()); // Boss/V1
System.out.println(q.poll()); // Bob/A1
System.out.println(q.poll()); // Alice/A2
System.out.println(q.poll()); // null,因为队列为空
}
class UserComparator implements Comparator<User> {
public int compare(User u1, User u2) {
if (u1.number.charAt(0) == u2.number.charAt(0)) {
// 如果两人的号都是A开头或者都是V开头,比较号的大小:
var new_u1_number = Integer.parseInt(u1.number.substring(1));
var new_u2_number = Integer.parseInt(u2.number.substring(1));
return new_u1_number-new_u2_number;
if (u1.number.charAt(0) == 'V') {
// u1的号码是V开头,优先级高:
return -1;
} else {
return 1;
class User {
public final String name;
public final String number;
public User(String name, String number) {
this.name = name;
this.number = number;
public String toString() {
return name + "/" + number;
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缪哈桑
import java.util.Comparator;
import java.util.PriorityQueue;
import java.util.Queue;
public class Main {
public static void main(String[] args) {
Queue<User> q = new PriorityQueue<>(new UserComparator());
// 添加3个元素到队列:
q.offer(new User("Bob", "A1"));
q.offer(new User("Alice", "A2"));
q.offer(new User("Boss", "V1"));
q.offer(new User("Ben", "A11"));
System.out.println(q.poll()); // Boss/V1
System.out.println(q.poll()); // Bob/A1
System.out.println(q.poll()); // Alice/A2
System.out.println(q.poll()); // null,因为队列为空
}
}
class UserComparator implements Comparator<User> {
public int compare(User u1, User u2) {
if (u1.number.charAt(0) == u2.number.charAt(0)) {
// 如果两人的号都是A开头或者都是V开头,比较号的大小:
var new_u1_number = Integer.parseInt(u1.number.substring(1));
var new_u2_number = Integer.parseInt(u2.number.substring(1));
return new_u1_number-new_u2_number;
}
if (u1.number.charAt(0) == 'V') {
// u1的号码是V开头,优先级高:
return -1;
} else {
return 1;
}
}
}
class User {
public final String name;
public final String number;
public User(String name, String number) {
this.name = name;
this.number = number;
}
public String toString() {
return name + "/" + number;
}
}