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Thread: read int from file into 3d array - FileReader? Help pls

  1. #1
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    Default read int from file into 3d array - FileReader? Help pls

    Hello there,

    i got an txt file with int values. Each line has exactly one number. Now i want to read those numbers into an 3d array. But i fail to do so. Can someone help me?
    i copied test.txt to the project and renamed it, so it fits the code.

    This is the code i have so far:

    import java.io.BufferedReader;
    import java.io.FileReader;
     
    import java.util.Arrays;
    import java.util.Scanner;
     
    public class lesen {
    	public static void main (String args[]) throws Exception {
    		//Scanner sc = new Scanner(new BufferedReader(new FileReader("sample.txt")));
    		FileReader inputFile = new FileReader("Datenzumlesen.txt");
    		int boxes = 10;  
    		int rows = 10;
    	    int columns = 10;
     
    	    int [][][] myArray = new int[boxes][rows][columns];
     
    	    	for(int i=0;i<10;i++) {
    	    		for (int j=0;j<10;j++) {
    	    			for(int k=0;k<10;k++) {
    	    				inputFile.read(myArray[i][j][k]); //(myArray[i][j][k]);
    	    			}
    	    		}
    	    	}
     
    	    inputFile.close();
     
    	    for (int i=0; i < 10; i++) {
    			for (int j=0; j < 10; j++) {
    				for (int k=0; k < 10; k++) {
    					//System.out.println("Test");
    					System.out.print(myArray[i][j][k]+" ");
    				}
    				System.out.println("");
    			}
    		System.out.println("i ist "+i);
    		}
    	}		
    }

    For creation of the values and saving i used the following code:

    import java.io.FileNotFoundException;
    import java.io.PrintWriter;
    import java.util.Scanner;
    import java.io.File;
     
     
    public class speichern{
     
    	public static void main (String args[]) throws FileNotFoundException {
    		PrintWriter outputFile = new PrintWriter("test.txt");
     
    		int [][][]array = new int[10][10][10];
    		int []array2 = new int[10];
    		int i = 0;
    		int j = 0;
    		int k = 0;
     
    		int min = 50;
    	    int max = 100;
     
    	    //Generate random int value from 50 to 100 
    	    System.out.println("Random value in int from "+min+" to "+max+ ":");
     
    		for (i=0; i < 10; i++) {
    			for (j=0; j < 10; j++) {
    				for (k=0; k < 10; k++) {
    					//System.out.println("Test");
    					array[i][j][k] = (int)Math.floor(Math.random()*(max-min+1)+min);
    					outputFile.println(array[i][j][k]);
    				}
    			}
    			//array2[i] = (int)Math.floor(Math.random()*(max-min+1)+min);
    			//outputFile.println(array2[i]);
    		}
    		outputFile.close();
     
    		for (i=0; i < 10; i++) {
    			for (j=0; j < 10; j++) {
    				for (k=0; k < 10; k++) {
    					//System.out.println("Test");
    					System.out.print(array[i][j][k]+" ");
    				}
    				System.out.println("");
    			}
    		System.out.println("i ist "+i);
    		}
     
    		System.out.println(array[8][1][3]);
    	}
     
    }

    Hope someone can help me out
    Last edited by AleXusher; May 10th, 2021 at 04:20 AM.

  2. #2
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    Default Re: read int from file into 3d array - FileReader? Help pls

    But i fail to do so
    Please explain what happens when the program is executed? What does "fail" mean?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: read int from file into 3d array - FileReader? Help pls

    If i execute i get

    Description Resource Path Location Type
    The method read(CharBuffer) in the type Reader is not applicable for the arguments (int) lesen.java /3darraylesen/src line 20 Java Problem

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    Default Re: read int from file into 3d array - FileReader? Help pls

    Ok, that is an error from the compiler saying the there is no read method in the Reader class that takes an int as an argument.

    The file that is it trying to read contains text created by the println method. The text "123" is a String and is not the same as the int value 123.
    An easy way to read text from a file and convert it to an int value is with the Scanner class's nextInt method.
    If you don't understand my answer, don't ignore it, ask a question.

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