I get this error at the end of my code execution. Could anyone tell me why and how I fix it.
<message>
java.lang.NullPointerException
at java.util.StringTokenizer.<init>(StringTokenizer.java:122)
at java.util.StringTokenizer.<init>(StringTokenizer.java:138)
at App3.<init>(App3.java:20)
at App3.main(App3.java:42)
</message>
<code (App3.java)>
import java.io.*;
import java.util.*;
public class App3 {
public App3 ( ) throws IOException, NullPointerException {
BufferedReader br = new BufferedReader(new FileReader(new File("data.txt")));
BufferedWriter out = new BufferedWriter(new FileWriter(new File("finalTest.txt")));
String c="| |";
int temp;
StringTokenizer st;
String line;
//while((line = br.readLine()) != null){
while(true){
//if( (line=br.readLine()) == null) break;
st = new StringTokenizer(br.readLine(),c);
temp = st.countTokens();
System.out.println("The Number of tokens found: " + temp);
for(int i = 0; i < temp; i++){
if(st.countTokens()!=0){
System.out.println(" " + st.nextElement());
//out.write(" " + st.nextElement());
} else{
System.out.println(" ");
//out.write(" " + st.nextToken());
} // end if
} //for
} //end while
} //end of constructor
public static void main ( String args[] ) throws IOException, NullPointerException {
new App3();
}//End of Main Method
} // End of Application
</code>
<My Text file contains (data.txt)>
PM1|null|null|11|XX|PID1|HOT1|PLAZA1|NO. 41|Main Description1|
PM2|null|null|12|XX|PID2|HOT2|PLAZA2|NO. 42|Main Description2|
PM3|null|null|13|XX|PID3|HOT3|PLAZA3|NO. 43|Main Description3|
</My Text file contains (data.txt)>