Home/ Questions/Q 7900277
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-03T08:55:48+00:00

I am reading two files and I want for each line in file one

  • 0

I am reading two files and I want for each line in file one sum up all the lines in file two. So far I have written the code below but it only does it for the first line in the files. Below is my code and sample files. Note I am getting java.util.NoSuchElementException

 import java.io.*;
 import java.util.Scanner;
 import java.util.StringTokenizer;
    public class knn {
    public static void main (String[]args)throws IOException{
      Scanner in = new Scanner(new FileInputStream("knn.txt"));
      Scanner in2 = new Scanner(new FileInputStream("knn2.txt"));
        while(in.hasNextLine()){
           String linetoprocess = in.nextLine();
           StringTokenizer st = new StringTokenizer(linetoprocess, " :");
             while(in2.hasNextLine()){
                String linetoprocess2 = in2.nextLine();
                StringTokenizer st2 = new StringTokenizer(linetoprocess2, " :");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
                System.out.print("("+st.nextToken()+","+st2.nextToken()+"), ");
               System.out.println("("+st.nextToken()+","+st2.nextToken()+")");

            }
        }
    }

knn.txt

1 1:5.1 2:3.5 3:1.4 4:0.2
1 1:4.9 2:3.0 3:1.4 4:0.2
1 1:4.7 2:3.2 3:1.3 4:0.2

knn2.txt

1 1:5.4 2:3.7 3:1.5 4:0.2
1 1:4.8 2:3.4 3:1.6 4:0.2
1 1:4.8 2:3.0 3:1.4 4:0.1
1 1:4.3 2:3.0 3:1.1 4:0.1

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I got it I should have called called the st.nextToken() before the inner while loop and store them in a variable which I can use later. Thanks for your suggestions. The complete code is below. 

    import java.io.*;
 import java.util.Scanner;
 import java.util.StringTokenizer;
 public class knn {
 public static void main (String[]args)throws IOException{
    Scanner in = new Scanner(new FileInputStream("knn.txt"));

    while(in.hasNextLine()){
        String linetoprocess = in.nextLine();
        StringTokenizer st = new StringTokenizer(linetoprocess, " :");
        Scanner in2 = new Scanner(new FileInputStream("knn2.txt"));
        String a = st.nextToken();
        String b = st.nextToken();
        String c = st.nextToken();
        String d = st.nextToken();
        String e = st.nextToken();
        String f = st.nextToken();
        String g = st.nextToken();
        String h = st.nextToken();
        String i = st.nextToken();

        while(in2.hasNextLine()){
        String linetoprocess2 = in2.nextLine();
        StringTokenizer st2 = new StringTokenizer(linetoprocess2, " :");
        System.out.print("("+a+","+st2.nextToken()+"), ");
        System.out.print("("+b+","+st2.nextToken()+"), ");
        System.out.print("("+c+","+st2.nextToken()+"), ");
        System.out.print("("+d+","+st2.nextToken()+"), ");
        System.out.print("("+e+","+st2.nextToken()+"), ");
        System.out.print("("+f+","+st2.nextToken()+"), ");
        System.out.print("("+g+","+st2.nextToken()+"), ");
        System.out.print("("+h+","+st2.nextToken()+"), ");
        System.out.println("("+i+","+st2.nextToken()+")");

        }
    }
}

    }

    • 0