storing elements from a file into an array/matrix

Question

im trying to save elements from an input file which contains lines such as:

numNodes 2
numEdges 2
node 0 0.62 
node 1 0.83 
edge 0 1 -silence- 0 78 
edge 0 2 -silence- 0 38

I've opened the file using scanner and broke the input into lines and words, to access each individual string.

Im trying to save each double in a node line within an array containing doubles:

this.nodeTimes = new double[numNodes];

And likewise save the three words on each edge line in an adjacency matrix:

this.adjMatrix = new Edge[numNodes][numNodes];

However in my attempts I hit ArrayIndexOutOfBoundsExceptions

 for (int i = 0; i < list.size(); i++) {
    String line = list.get(i);
...
    } else if (words[0].equals("node")) {
        nodeTimes[numNodes] = Double.parseDouble(words[3]); // trying to get doubles
    } else if (words[0].equals("edge")) {
            adjMatrix[Integer.parseInt(words[1])][Integer.parseInt(words[2])] = new Edge((words[3]), Integer.parseInt(words[4]), Integer.parseInt(words[5])); // trying to store edge values

this similarly happens if I try something like:

    while(openedFile.hasNextDouble()){
        nodeTimes[numNodes] = openedFile.nextDouble();
    }

Not quite sure how im getting hung up

Edit:

accessing with:

nodeTimes[Integer.parseInt(words[1])] = Double.parseDouble(words[3]);    

and

adjMatrix[Integer.parseInt(words[1])][Integer.parseInt(words[2])] = new Edge((words[3]), Integer.parseInt(words[4]), Integer.parseInt(words[5]));

also seem to give me an exception.

Answer 1

Looking at your code again, I see where the issue is.

You are creating an array of size numNodes with this line.

this.nodeTimes = new double[numNodes];

Then you are trying to access the index at numNodes with this line

nodeTimes[numNodes] = Double.parseDouble(words[3]);

Accessing the index at the size of the array will always give you an ArrayIndexOutOfBoundsExceptions

You can only go from 0 to numNodes - 1