How to Implement a Size-Limited Queue in Java?

How to Implement a Size-Limited Queue in Java

In Java, a standard implementation for a queue with a fixed maximum size does not exist. However, implementing it manually is straightforward:

import java.util.LinkedList;

public class LimitedQueue<E> extends LinkedList<E> {
    private int limit;

    public LimitedQueue(int limit) {
        this.limit = limit;
    }

    @Override
    public boolean add(E o) {
        super.add(o);
        while (size() > limit) {
            super.remove();
        }
        return true;
    }
}

Apache Commons Collections Solution

Alternatively, Apache Commons Collections 4 provides a CircularFifoQueue class that meets the requirements:

    import java.util.Queue;
    import org.apache.commons.collections4.queue.CircularFifoQueue;

    Queue<Integer> fifo = new CircularFifoQueue<>(2);
    fifo.add(1);
    fifo.add(2);
    fifo.add(3);
    System.out.println(fifo); // [2, 3]

For Apache Commons Collections 3.x, use CircularFifoBuffer.

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