1.2.4 一种能够累加数据的抽象数据类型

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package com.chapter_one;import com.algs4.stdlib.StdDraw;/*** * 一种能够累加数据的抽象数据类型 * @author Luodi * */public class VisualAccumulator {    private double total;    private int N = 0;    public VisualAccumulator(int trials, double max) {        /***         * 设置x轴的范围         */        StdDraw.setXscale(0, trials);        /***         * 设置y轴的范围         */        StdDraw.setYscale(0, max);        /***         * 设置画笔的大小         */        StdDraw.setPenRadius(.005);    }    public void addDataValue(double val) {        N++;        this.total += val;        StdDraw.setPenColor(StdDraw.DARK_GRAY);        StdDraw.point(N, val);        StdDraw.setPenColor(StdDraw.RED);        StdDraw.point(N, total / N);    }    /***     * 求平均值     * @return     */    public double mean() {        return total / N;    }    public String toString() {        return "Mean(" + N + " values): " + mean();    }    public static void main(String[] args) {        int T = 1000;        VisualAccumulator a = new VisualAccumulator(T, 1.0);        for (int t = 0; t < T; t++) {            a.addDataValue(Math.random());            System.out.println(a);        }    }}

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