Ex1_2_10

要求:能进行±1的可视化counter

import edu.princeton.cs.algs4.StdDraw;
import edu.princeton.cs.algs4.StdRandom;
public class Ex1_1_10 {
    public static class VisualCounter{
        private int times = 0;
        private int count = 0;
        private int max;
        public  VisualCounter(int N, int max){
            this.max = max;
            StdDraw.setXscale(0,N);
            StdDraw.setYscale(-max,max);
            StdDraw.setPenRadius(.005);
        }
        public void increment(){
            count++;
            times++;
            if(count > max) count = max;
            StdDraw.point(times,count);
        }
        public void reduction(){
            times++;
            count--;
            if(count < -max) count = -max;
            StdDraw.point(times,count);
        }
    }
    public static void main(String[] args){
        int N = Integer.parseInt(args[0]);
        int max = Integer.parseInt(args[1]);
        VisualCounter counter = new VisualCounter(N,max);
        for(int i=0; i<N; i++){
            if(StdRandom.bernoulli(0.5)){
                counter.increment();
            }else{
                counter.reduction();
            }
        }
    }
}

结果(N = 10000, max = 100)