Question

------K-Nearest-Neighbor Prediction Program---

The values you entered are :  sunny cool high true no

Comparring the values :     sunny      hot     high    FALSE dist = 0 and play =  no 
Comparring the values :     sunny      hot     high     TRUE dist = 0 and play =  no 
Comparring the values :  overcast      hot     high    FALSE dist = 0 and play = yes 
Comparring the values :     rainy     mild     high    FALSE dist = 0 and play = yes 
Comparring the values :     rainy     cool   normal    FALSE dist = 0 and play = yes 
Comparring the values :     rainy     cool   normal     TRUE dist = 0 and play =  no 
Comparring the values :  overcast     cool   normal     TRUE dist = 0 and play = yes 
Comparring the values :     sunny     mild     high    FALSE dist = 0 and play =  no 
Comparring the values :     sunny     cool   normal    FALSE dist = 0 and play = yes 
Comparring the values :     rainy     mild   normal    FALSE dist = 0 and play = yes
Comparring the values :     sunny     mild   normal     TRUE dist = 0 and play = yes 
Comparring the values :  overcast     mild     high     TRUE dist = 0 and play = yes 
Comparring the values :  overcast      hot   normal    FALSE dist = 0 and play = yes 
Comparring the values :     rainy     mild     high     TRUE dist = 0 and play =  no 
Given the data, the prediction to play is:  no

我的问题是距离没有增加。它假设按以下顺序降序：2,1,3,3,3,2,2,2,2,4,2,2,4,2但我全部为零。

这是我的代码..... :::

import java.util.Scanner;
import java.io.*;
public class lab2
{
    public static void main (String [] args)
    throws FileNotFoundException
    {

        Scanner input = new Scanner (System.in);
        Scanner in = new Scanner(new File("data.txt"));

        String queryOutlook = "  sunny  ";
        String queryHumidity = " high ";
        String queryTempurature = " hot ";
        String queryWind = " true ";
        String queryPlay = " play ";
        String outlook = null;
        String humidity = null;
        String tempurature = null;
        String wind = null;
        String play = null;
        int dist = 0;
        System.out.print("------K-Nearest-Neighbor Prediction Program---\n\n");
        System.out.print("The values you entered are :  ");
        outlook = input.next();
        tempurature = input.next();
        humidity = input.next();
        wind = input.next();
        play = input.next();
        while(in.hasNext())
        {
            outlook = in.next();
            tempurature = in.next();
            humidity = in.next();
            wind = in.next();
            play = in.next();
            dist = 0;
            if (outlook.equalsIgnoreCase(queryOutlook) )
                dist++;
            if (humidity.equalsIgnoreCase(queryHumidity) )
                dist++;
            if (tempurature.equalsIgnoreCase(queryTempurature) )
                dist++;
            if (wind.equalsIgnoreCase(queryWind) )
                dist++;
            if (play.equalsIgnoreCase(queryPlay) )
                dist++;

            System.out.printf("\r\nComparring the values :  %8s %8s %8s %8s", outlook, tempurature, humidity, wind);
            System.out.printf(" dist = %1d and play = %3s ",dist,play);
        }
        System.out.printf("\nGiven the data, the prediction to play is: %3s \n",play);
        in.close();
    }

}

Answer 1

默认情况下，当抓取令牌时，扫描程序会忽略空格，因此.equals失败，因为常量中有空格。

JAVA程序和我的距离没有增加

1 个答案: