代码可以编译,但是当我执行它时,错误提示


  “ java.util.NoSuchElementException”并突出显示湿度= input.next();


示例输出如下:

K-Nearest Neighbor Prediction Program:

The values you entered are: sunny cool high true

Comparring the values:  sunny  hot   high false dist = 2 and play = no
Comparring the values:  sunny  hot  high true  dist = 1 and play = no
Comparring the values:  overcast hot  high false dist = 3 and play = yes
Comparring the values:  rainy mild  high false dist = 3 and play = yes
Comparring the values:  rainy cool  normal false dist = 3 and play = yes


这是我的代码:

import java.util.Scanner;
public class lab2
{
    public static void main (String [] args)
    {
        Scanner input = new Scanner ("data.txt");
        System.out.println("The values you entered are : ");
        String queryOutlook = "sunny";
        String queryHumidity = "high";
        String queryTemp = "cool";
        String queryVerd = "true";
        String outlook = null;
        String humidity = null;
        String temp = null;
        String verd = null;
        String play= null;
        int distance = 0;
        while(input.hasNext())
        {
            outlook = input.next();
            ***humidity = input.next();***
            temp = input.next();
            verd = input.next();
            if (!outlook.equalsIgnoreCase(queryOutlook) )
            distance++;
            if (!humidity.equalsIgnoreCase(queryHumidity) )
            distance++;
            if (!temp.equalsIgnoreCase(queryTemp) )
            distance++;
            if (!verd.equalsIgnoreCase(queryVerd) )
            distance++;


            System.out.println(outlook + humidity + temp + verd + "\t" + play + distance);


同样,该程序与K邻居最近的预测有关,这是自上一堂课以来我从未听说过的。任何帮助,将不胜感激!!!

最佳答案

    while(input.hasNext()) {
        outlook = input.next();
        humidity = input.next();
        temp = input.next();
        verd = input.next();


您正在检查输入是否有一个下一个元素,如果有,则得到四个下一个元素。在获取每一个之前,您应该检查一下。

关于java - 我的while循环中JAVA程序出现运行时错误,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/21539550/

10-14 11:12
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