Null Pointer Exception in reading array
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Programming Questions
•
1 year ago
Hello, I started Processing yesterday. I have imported CSV data into 2d array using a good public code, but I failed in reading it. Could you tell me why first "println(csv[0][0]); " works, but second "println(csv[0][0]); " makes error?
---------------------------
- String lines[];
- int csvWidth;
- String [][] csv;
- void setup() {
- String lines[] = loadStrings("Book1.csv");
- String [][] csv;
- int csvWidth=0;
- //calculate max width of csv file
- for (int i=0; i < lines.length; i++) {
- String [] chars=split(lines[i],',');
- if (chars.length>csvWidth){
- csvWidth=chars.length;
- }
- }
- //create csv array based on # of rows and columns in csv file
- csv = new String [lines.length][csvWidth];
- //parse values into 2d array
- for (int i=0; i < lines.length; i++) {
- String [] temp = new String [lines.length];
- temp= split(lines[i], ',');
- for (int j=0; j < temp.length; j++){
- csv[i][j]=temp[j];
- }
- }
- println(csv[0][0]); // O.K.
- }
- void draw(){
- background(0);
- println(csv[0][0]); // NullPointerException
- }
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