Java直方图

发布网友发布时间：2022-05-18 03:01

共1个回答

热心网友时间：2023-10-08 15:14

import java.util.Arrays;
import java.util.Scanner;

public class Histogram{
    private String title;
    private double start, stop;
    private double[] data;
    public Histogram(String title, double start, double stop, double[] data, int numBars){
        this.title = title;
        this.start = start;
        this.stop = stop;
        this.data = data;
    }
    public String toString(){
    int len = data.length;
        String[] arr = new String[len];
        double tmp = start;
        double each = (stop - start) / (len - 1);
        double max = Double.MIN_VALUE;
        for(int i = 0; i < len; i++)
{
        double di = data[i];
max = di > max ? di : max;
}
        for(int i = 0; i < len; i++)
{
        String x = "";
        int num = Integer.parseInt(String.format("%.0f", data[i] * 40 / max));
        for(int j = 0; j < num; j++)
{
x += "#";
}
arr[i] = tmp + " " + x + " " + data[i];
tmp += each;
}
        return String.format("%s%s20^", title,
        Arrays.toString(arr).replaceAll("\\x20", "")
        .replaceAll("[\\[\\],]", "\r\n"));
    }
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter a histogram.");
        System.out.println("Title: ");
        String title = scan.nextLine();
        System.out.println("Start value: ");
        double start = Double.parseDouble(scan.nextLine());
        System.out.println("End value: ");
        double stop = Double.parseDouble(scan.nextLine());
        System.out.println("Data: ");
        String d = scan.nextLine();
        scan.close();
        String[] ds = d.split("\\s+");
        double[] data = new double[ds.length];
        for(int i = 0; i < data.length; i++){
            data[i] = Double.parseDouble(ds[i]);
        }
        Histogram hist = new Histogram(title, start, stop, data, data.length);
        System.out.println(hist.toString());
    }
}