file io - Java - Using multiple PrintWriter but saves only last println -

i'm designing program split data stored in text file 2 separate files based on label of data.

here small version of data.

0,1,2,normal.  5,5,5,strange. 2,1,3,normal. 

i use class store each line sample. class parses line store last value label. encapsulated each line object, because intend add features later.

here code sample class

import java.util.scanner;  public class sample {     string[]str_vals = new string[3];     string label;     sample(scanner line) {         (int i=0; i<3; i++) {             str_vals[i] = line.next();         }         label = line.next();     }     string getvalsforcsv() {         stringbuilder retval = new stringbuilder();          (int i=0; i<3; i++) {             retval.append(str_vals[i]).append(",");         }         retval.append(label).append(".");         return retval+"";     }     string getlabel() {         return label;     } } 

below code in question. separator class.

import java.io.*; import java.util.scanner;  public class separator {     public static final string datafile = "src/etc/test.txt";     public static void main(string[] args) throws filenotfoundexception {         rundata();     }     public static void rundata() throws filenotfoundexception {         try (scanner in = new scanner(new file(datafile))) {             // kddcup file uses '.\n' @ end of each line             // setting delimiter consume period             in.usedelimiter("[.]\r\n|[.]\n|\n");             sample curr;             while(in.hasnext()) {                 // line hold fields single sample                 scanner line = new scanner(in.next());                 line.usedelimiter(", *");                 curr = new sample(line);                 try (                     printwriter positive = new printwriter(new file(datafile+"-pos"));                     printwriter negative = new printwriter(new file(datafile+"-neg"));                 ) {                     if (curr.getlabel().equals("normal")) {                         positive.println("good");                     } else {                         negative.println("bad");                     }                 }             }         }     } } 

this issue experiencing code saves last sample seen respective file. above data test.txt-neg empty , test.txt-pos have single line good; not have 2 good's expected.

if modify test.txt data include first 2 lines, files states reversed (i.e. test.txt-neg has bad , test.txt-pos empty). please explain me going on, , how fix error?

because error pointed out in comment. wanted give credit kevino , elliott frisch solution.

as mentioned, i'm creating new printwriter each time , creating printwriter in it's default mode of overwriting file. result saves both files based on single sample.

to correct error, have pulled out instantiations of printwriter in try-with-resource block of scanner object

import java.io.*; import java.util.scanner;  public class separator {     public static final string datafile = "src/etc/test.txt";     public static void main(string[] args) throws filenotfoundexception {         rundata();     }     public static void rundata() throws filenotfoundexception {         try (             scanner in = new scanner(new file(datafile));             printwriter positive = new printwriter(new file(datafile+"-pos"));             printwriter negative = new printwriter(new file(datafile+"-neg"));         ) {             // kddcup file uses '.\n' @ end of each line             // setting delimiter consume period             in.usedelimiter("[.]\r\n|[.]\n|\n");             sample curr;             while(in.hasnext()) {                 // line hold fields single sample                 scanner line = new scanner(in.next());                 line.usedelimiter(", *");                 curr = new sample(line);                 if (curr.getlabel().equals("normal")) {                     positive.println("good");                 } else {                     negative.println("bad");                 }             }         }     } }