Java 中保存最后 N 个元素的大小受限队列

Java 中保存最后 N 个元素的大小受限队列

java
import java.util.LinkedList;
public class LimitedQueue {
    private final int maxSize;
    private final LinkedList queue;
    public LimitedQueue(int maxSize) {
        this.maxSize = maxSize;
        this.queue = new LinkedList<>();
    }
    public void add(T element) {
        queue.addLast(element);
        if (queue.size() > maxSize) {
            queue.removeFirst();
        }
    }
    public T get(int index) {
        return queue.get(index);
    }
    public int size() {
        return queue.size();
    }
}

java
public class Main {
    public static void main(String[] args) {
        LimitedQueue loginRecords = new LimitedQueue<>(3);
        loginRecords.add("User1");
        loginRecords.add("User2");
        loginRecords.add("User3");
        loginRecords.add("User4");
        System.out.println("最近登录的用户记录：");
        for (int i = 0; i < loginRecords.size(); i++) {
            System.out.println(loginRecords.get(i));
        }
    }
}