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();
        }
    }
}

上面的代码来自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。无法从外部软件包访问

如何解决？

Answer 1

您需要java.util.Queue而不是java.awt.Queue，它可以容纳您想要的任何东西

java.awt软件包涉及UI，图形和图像：Documentation，而java.awt.Queue在这里用于容纳java.awt.Event元素

仅用于改进：有关实施循环FIFO的信息，在此处

哪个可以给类似的东西

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

无法从外部包访问java.awt.Queue

1 个答案: