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  1. #1
    kool001 is offline Member
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    Dec 2009
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    Question How to create an array of linked list reading data from a file


    I need to create a graph such that i read the number of vertices from a file and the edges too. Example "a b 5"--> means theres an edge from source 'a', destination 'b' and the edge weight is '5'. If i have some random number of vertices say 5, i need to create an adjacency list of the graph, using an array of linked lists. But i dont know how to use it!!

    Could anybody help me with it?
    Last edited by kool001; 12-03-2009 at 06:17 AM.

  2. #2
    kool001 is offline Member
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    Dec 2009
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    Well, here i m trying store the vertices(4) in an array. and trying to read them. But i m getting an error of "Array Index out of Bounds Exception.
    I know the error is in the line i have highlighted(red). And i have tried various methods. But not working.

    Java Code:
    public void readInput()
    	  Scanner input = null;
    	   input = new Scanner(new FileInputStream("Test1.txt"));
    		int vertex = input.nextInt();
    		System.out.println("printing # of vertex "+vertex); 
     	   String[] array = new String[vertex];
    		System.out.println("array size "+ array.length);
    		// reading vertex from file and storing them in the array
    		for(int i=0;i<=array.length;i++) 
    		  System.out.println("vertex "+array[i]);
    the error that i get is

    Java Code:
    returned from absgraph
    printing # of vertex 4
    array size 4
    vertex a
    vertex b
    vertex c
    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
    	at AbsGraph.readInput(
    	at DriverProgram.main(
     ----jGRASP wedge2: exit code for process is 1.
    what fuction should i use?

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