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Thread: how do I fix a "java.lang.ArrayIndexOutofBoundsException:6" problem?

  1. #1
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    Default how do I fix a "java.lang.ArrayIndexOutofBoundsException:6" problem?

    I have this program to see the occurrences of a character in a string stored in a text file.
    My text file has the following contents (as shown below):
    P-P-N-N-L-V
    N-R-U-S-R-Q
    K-Q-E-L-E-A
    A-J-B-G-E-F
    F-E-L-Q-R-R
    U-F-J-V-I-M
    P-I-Q-K-B-K
    U-N-L-F-O-B
    M-A-N-M-H-O
    P-Q-J-D-N-I
    G-U-O-D-F-I
    Q-M-M-B-C-Q
    N-B-I-L-E-J
    S-A-T-Q-H-U
    C-L-G-U-J-M
    R-P-V-M-A-A
    C-R-A-V-L-B
    M-U-Q-K-M-Q
    E-I-C-H-V-J
    J-N-N-K-R-P


    As you notice, each character is seperated by a hypen (serving as its delimiter). I want to only go through 10 lines in the text, instead of all 20 of them. So, I wrote the program in such a way that I intend to reach into the indices of each character in the text file. Since there are six characters in each line so that means there are 6 indices - and there are 10 lines I only want to go through. So, 6 indices times 10 lines equals 60 indices. Hence, there are only 60 indices I need to go through. In that manner, it's like I have gone through only 10 lines through that way.
    It compiled perfectly fine but upon running it, I ran through an error in the black DOS screen that says "java.lang.ArrayIndexOutofBoundsException: 6 ".
    How do I work around that?

    The code I wrote is shown below...
    import java.io.*;
    import java.util.*;
     
    public class hotandcoldclusterdeterminer_test {
    	public static void main (String args [])throws IOException {
    		Scanner search = new Scanner (new File ("string.txt"));
    		Scanner record = new Scanner (new File ("output.txt"));
     
    		int counterA=0;
    		int counterB=0;
    		int counterC=0;				
     
    		String counterrecordA=" ";		
    		String counterrecordB=" ";		
    		String counterrecordC=" ";				
    		String spacer="--------------------------------------------------------------";
     
    		while (search.hasNextLine())
    		     { //while loop starting brace
    			  String scanline = search.nextLine();
    			  String charArray[]  = scanline.split("-");
    			  for (int counter=0; counter<=10; counter++)
    			     { // for loop starting brace
    			      if (charArray[counter].equals("A"))
    			        {  //first main outer if loop starting brace
    				     counterA++;
    				     counterrecordA="A has occurred " + counterA + " times \t\n";
    			        }  //first main outer if loop ending brace
    			 else if (charArray[counter].equals("B"))
    			        {  //second main outer if loop starting brace
    				     counterB++;
    				     counterrecordB="B has occurred " + counterB + " times \t\n";
    			        }  //second main outer if loop ending brace
    			 else if (charArray[counter].equals("C"))
    			        {  //third main outer if loop starting brace
    				     counterC++;
    				     counterrecordC="C has occurred " + counterC + " times \t\n";
    			        }  //third main outer if loop ending brace			        
            	     } // for loop ending brace
    		     }//while loop ending brace
     
    		FileWriter recorder=new FileWriter("output.txt",true);
    		recorder.write(spacer+System.getProperty("line.separator"));						
    		recorder.write(counterrecordA+System.getProperty("line.separator"));
    		recorder.write(spacer+System.getProperty("line.separator"));						
    		recorder.write(counterrecordB+System.getProperty("line.separator"));
    		recorder.write(spacer+System.getProperty("line.separator"));						
    		recorder.write(counterrecordC+System.getProperty("line.separator"));
    		recorder.write(spacer+System.getProperty("line.separator"));						
    		recorder.close();				        		
    	}
    }
    Last edited by PC_flea; April 26th, 2014 at 09:02 AM. Reason: edited typo errors in post


  2. #2
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    Default Re: how do I fix a "java.lang.ArrayIndexOutofBoundsException:6" problem?

    What line is the error on? Where is the index given a value?
    The Normal for loop continuation condition should be for while the index is LESS than the size of the array.
    Remember array indexes range from 0 to the array length-1

    The for loop should use the .length attribute of the array to determine its length, not a magic number like 10.

    --- Update ---

    Also posted at: how do I fix a "java.lang.ArrayIndexOutofBoundsException:6" problem?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: how do I fix a "java.lang.ArrayIndexOutofBoundsException:6" problem?

    So if I am to use the length attribute, is this how I should write it?
    for (int charArray.length=0; charArray.length <=60;charArray.length++)

    And the loop -
    for (int counter=0; counter<=6; counter++)
    - will be inside the loop above then, is that right?
    (Like the one below?)
              for (int charArray.length=0; charArray.length <=60;charArray.length++) 
                 {
                   for (int counter=0; counter<=6; counter++)
                      { ... }
                 }

    By the way, were the syntaxes I wrote correct?

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    Default Re: how do I fix a "java.lang.ArrayIndexOutofBoundsException:6" problem?

    What happened when you tried it?

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