java - How to store the ArrayList in matrix format and ArrayList Should be String data? -


in code got error arrayoutofboundexception , nullpointerexception in ml.getv() method

this matrix class

public class matrix {     private double [][] v = null; // public members     public static int rowsofvmatrix = 9219;     public static int colsofvmatrix = 5;     public static int row_increase = 20;      public double[][] getv() {         return v;     }     public void setv(double[][] v) {         v = v;     }     public static int getrowsofvmatrix() {         return rowsofvmatrix;     }     public static void setrowsofvmatrix(int rowsofvmatrix) {         rowsofvmatrix = rowsofvmatrix;     }     public static int getcolsofvmatrix() {         return colsofvmatrix;     }     public static void setcolsofvmatrix(int colsofvmatrix) {         colsofvmatrix = colsofvmatrix;     }     public static int getrow_increase() {         return row_increase;     }     public static void setrow_increase(int row_increase) {         row_increase = row_increase;     }     public matrix(){         v = new double[matrix.rowsofvmatrix][matrix.colsofvmatrix];     }     public matrix(int rowssize, int colsize){         matrix.rowsofvmatrix = rowssize;         matrix.colsofvmatrix = colsize;         v = new double[matrix.rowsofvmatrix][matrix.colsofvmatrix];     }     public matrix(matrix m){         v = new double[matrix.rowsofvmatrix][matrix.colsofvmatrix];         (int = 0; < matrix.rowsofvmatrix; i++) {             (int j = 0; j < matrix.colsofvmatrix; j++) {                 this.v[i][j] = m.v[i][j];             }         }            }

i tried code store arraylist in matrix using following code

public static list<matrix> readfromfilegetmatrixlist(string filename)                 throws ioexception {             list<matrix> ml = new arraylist<matrix>();             matrix m = null;             filereader fr = new filereader(filename);             bufferedreader br = new bufferedreader(fr);             string linecontent;             int matrixnum = 0;             while ((linecontent = br.readline()) != null) {                 if (linecontent.contains("#")) {                     matrixnum++;                 }             }         matrixnum--;// last 1 may incomplete,so remove list             br.close();             fr.close();             fr = new filereader(filename);             br = new bufferedreader(fr);             int matrixrow_index = 0;             int matrixcount = 0;             while ((linecontent = br.readline()) != null) {                 if (linecontent.contains("#")) {                     if (matrixcount > 0) {                         ml.add(m);                         matrixrow_index = 0;                     }                     if (matrixcount == matrixnum)                         break;                     m = new matrix();                     continue;                 }                 if (linecontent.equals("")) {                     matrixcount++;                     continue;                 }                 string[] str = linecontent.split("\t");                 (int j = 0; j < str.length; j++) {                     m.getv()[matrixrow_index][j] = double.parsedouble(str[j]); //null pointer exception      }                 matrixrow_index++;             }             return ml;         }

this text file sample

0 qid:1 1:1.000000 2:0.693147 3:0.166667 #docid = 285257 0 qid:1 1:1.000000 2:0.693147 3:0.166667 #docid = 285285 0 qid:1 1:1.000000 2:0.693147 3:0.166667 #docid = 285289 0 qid:1 1:1.000000 2:0.693147 3:0.166667 #docid = 285245

in above code getting arrayboundofindexerror


Comments

Post a Comment

Popular posts from this blog

php - failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request -

this code i'm using find latitude , longitude of place: function coords($address){ echo $url="http://maps.googleapis.com/maps/api/geocode/json?address=".$address; $json = file_get_contents(urlencode($url)); $data = json_decode($json, true); print_r($data['results'][0]['geometry']['location']['lat']); print_r($data['results'][0]['geometry']['location']['lng']); } however returns warning: failed open stream: http request failed! http/1.0 400 bad request if use above code in simple procedure works fine not in function. note: have tried curl_init()... method produced same result? instead of encoding whole url encode address part. following code work fine $add='jamshoro phase 2'; $url="http://maps.googleapis.com/maps/api/geocode/json?address=".urlencode($add); $json = file_get_contents($url); $data = json_decode($json, true); print_r($data['r
Read more

java - How to filter a backspace keyboard input -

i have code gives message when key number pressed: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochararray().length - 1]; if (!(ch >= '0' && ch <= '9')) { system.out.println("the char entered not number"); t.consume(); } } }); now if press on wrong button , press backspace remove it, error message. how can add backspace input if statement? i have found answer: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochar
Read more

java - Show Soft Keyboard when EditText Appears -

i have code in android app, alert dialog , keyboard, , when dialog shown want keyboard appear. not , not sure why? here code: final alertdialog.builder alert = new alertdialog.builder(this); alert.settitle("title"); alert.setmessage("message"); final edittext input = new edittext(this); input.setinputtype(inputtype.type_class_number); alert.setview(input); input.setonfocuschangelistener(new view.onfocuschangelistener() { @override public void onfocuschange(view v, boolean hasfocus) { if (hasfocus) { log.i(tag, "in focus"); inputmethodmanager inputmethodmanager = (inputmethodmanager) getsystemservice(context.input_method_service); inputmethodmanager.showsoftinput(input, inputmethodmanager.show_implicit); } } }); but keyboard not appear though edit text in focus, , tell appear why, doesn't come up? thanks in advance.
Read more