无法从外部包访问 java.awt.Queue

Question

java版本：SDK 1.8.0_151

IDE：IDEA IntelliJ

import java.awt.Queue;
import java.util.LinkedList;

public class SimpleMovingAverage {
    private final Queue<Double> window = new LinkedList<Double>();
    private final int period;
    private double sum;

    public SimpleMovingAverage(int period) {
        assert period > 0 : "Period must be a positive integer";
        this.period = period;
    }

    public void newNum(double num) {
        sum += num;
        window.add(num);
        if (window.size() > period) {
            sum -= window.remove();
        }
    }

    public double getAvg() {
        if (window.isEmpty()) {return 0.0;} // technically the average is undefined
        return sum / window.size();
    }

    public static void main(String[] args) {
        double[] testData = {1, 2, 3, 4, 5, 5, 4, 3, 2, 1};
        int[] windowSizes = {3, 5};
        for (int windSize : windowSizes) {
            SimpleMovingAverage ma = new SimpleMovingAverage(windSize);
            for (double x : testData) {
                ma.newNum(x);
                System.out.println("Next number = " + x + ", SMA = " + ma.getAvg());
            }
            System.out.println();
        }
    }
}

以上代码来自https://rosettacode.org/wiki/Averages/Simple_moving_average#Java

当我创建一个名为 SimpleMovingAverage 的类并从上述网站复制代码时，会报告错误。

“java.awt.Queue”在“java.awt”中不公开。无法从外部包访问

如何解决？

Answer 1

你需要java.util.Queue而不是java.awt.Queue，它可以容纳你想要的任何东西

java.awt 包是关于 UI、图形和图像的：Documentation，java.awt.Queue 用于容纳 java.awt.Event 元素

---

仅用于改进：对于循环 FIFO 的实施，这里有一些信息

• Is there a fixed sized queue which removes excessive elements?

• Basic implem of a CircularQueue

这可以给出类似的东西

public void newNum(double num) {
    window.add(num);
}