Hi!
My project has two text file:input and output
java.util.NoSuchElementException: No line foundread exception
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.write(Writer.java:140)
at nfa2dfa.NfaToDfa.OutputFile(NfaToDfa.java:217)
at nfa2dfa.Main.main(Main.java:30)
I don't know what they mean?!
Hi!
My project has two text file:input and outputjava.util.NoSuchElementException: No line foundread exception
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.write(Writer.java:140)
at nfa2dfa.NfaToDfa.OutputFile(NfaToDfa.java:217)
at nfa2dfa.Main.main(Main.java:30)I don't know what they mean?!
as for as i can see it says you are trying to write a null value to the textfile, check in your write method and make sure the variable thats throwing the exception gets initialized. maybe with a few println()'s
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.write(Writer.java:140)
at nfa2dfa.NfaToDfa.OutputFile(NfaToDfa.java:217)
Look at line 217 where you call the write method and check the values of the variables
line 140 is
public void write(String str) throws IOException {
write(str, 0, str.length());
}(java/io/Writer.java)
can anyone help me if I attach my project here?
Did you ever find What variable is null?
And then check to see why it is null and change the code so the variable would have a valid value.
I've checked my variables...here is complete code
I solved that but there's another one...
Exception in thread "main" java.lang.NullPointerException
java.util.NoSuchElementException: No line foundread exception
at java.io.Writer.write(Writer.java:140)
at nfa2dfa.NfaToDfa.OutputFile(NfaToDfa.java:236)
at nfa2dfa.Main.main(Main.java:32)
Java Result: 1
//import java.lang.String;
package nfa2dfa;
import java.io.*;
import java.util.*;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Emitis
*/
public class NfaToDfa {
String strtmp=null;
String strtmp2=null;
String strtmp3=null;
String strtmp4=null;
int i, j;
String[] Alpha=new String[27];
String rulenfa=null; // tedad e qanunhaye harkat dar nfa
String Fstate=null;
String[] Lstate=new String[100];
String[][] Rules=new String[100][3];
String State[]=new String[100];
String delimiter = ",";
String s=null;
String[][] dfa=new String[100][3];
int[] check=new int[100];
int n=0;
int d,t,h;
int p=0;
int g=1 ;
int x=0;
int sum=0;
String not="not";
String[][] converted=new String[100][3];
String temp=null;
String[] Lsatateconvereted=new String[100];
public void inputfile() throws FileNotFoundException {
try{
Scanner nfafile=new Scanner(new FileInputStream("input.txt"));
// C:/JAVA/Topics.txt
// File file=new File("input.txt");
// Scanner scan=new Scanner(System.in);
// alefbaye zaban
strtmp = nfafile.nextLine();
State = strtmp.split(delimiter);
strtmp2=nfafile.nextLine();
Alpha=strtmp2.split(delimiter);
Fstate=nfafile.nextLine();
strtmp3 = nfafile.nextLine();
Lstate = strtmp3.split(delimiter);
rulenfa=nfafile.nextLine();
while(nfafile.hasNextLine()==true){
for(i=0;i<=100;i++){
strtmp4 = nfafile.nextLine();
Rules[i] = strtmp4.split(delimiter);
}
}
nfafile.close();
}
catch (Exception e){
System.out.println(e+"read exception");
}
}
//***************************************************************************************
public void converter(){
// dfa[0][0]=null;
//dfa[0][0].concat(Rules[0][0]);
dfa[0][0]=Rules[0][0];
dfa[0][1]=Rules[0][1];
n++;
s=Rules[0][2];
for( ;Rules[g][0].compareTo(Rules[0][0])==0 && Rules[g][1].compareTo(Rules[0][1])==0;g++){
// s.concat(','+Rules[g][2]);
s=s+','+Rules[g][2];
}
dfa[0][2]=s;
s=null;
//flag
int fl=0;
for(int i=g;i<Rules.length && Rules[i][0]!=null ;i++ ){
//dfa[n][0]=Rules[i][0];
// s=Rules[i-1][0];
s=Rules[i-1][2];
for( ;i<100 && s!=null && i<Rules.length && Rules[i][0].compareTo(Rules[i-1][0])==0 && Rules[i][1].compareTo(Rules[i-1][1])==0;i++){
s=s+Rules[i][2]+',';
fl=1;
}
// if(searchDfa(s).compareTo(not)==0)
// s.concat(dfa[n][2]);
if(fl==1){
i--;
fl--;
}
else{
if((i<99 && i<Rules.length-1) && (Rules[i][0]!=null && Rules[i+1][0]!=null)&& (Rules[i][0].compareTo(Rules[i+1][0])!=0 || Rules[i][1].compareTo(Rules[i+1][1])!=0))
s=Rules[i][2];
}
if(Rules[i][0]!=null&& Rules[i][1]!=null && Rules[i+1][0]!=null && Rules[i-1][1]!=null && s!=null )
if(i+1<Rules.length && (Rules[i][0].compareTo(Rules[i+1][0])!=0 || Rules[i][1].compareTo(Rules[i-1][1])!=0)){
// if(Rules[i][0]!=null&& Rules[i][1]!=null && s!=null)
dfa[n][0]=Rules[i][0];//
dfa[n][1]=Rules[i][1];
dfa[n][2]=s;
}
n++;
s=null;
}
converted[0][0]=converted[0][0]+dfa[0][0]; //shorue amaliate convert
for(int i=0;i<100 && i<converted.length ;i++){
LandaTrance();//aya state i ba landa be jaiie rafte ya na
for(int r=0;r<27 && r<Alpha.length && Alpha[r]!=null && converted[i][0]!=null ;r++){
temp=search(converted[i][0],Alpha[r]);//ba tamame alphabet check mikone ke masalan state i be che jahaiie mire
if(temp.compareTo(not)!=0){
converted[i][1].concat(converted[i][1]+Alpha[r]);
converted[i][2].concat(converted[i][2]+","+temp);
}
LandaTrance();
}
}
for(d=0;d<converted.length && converted[d][0]!=null && d<100 ;d++){
for(int m=0;m<Lstate.length && Lstate[m]!=null && m<100 ;m++){
if(converted[d][0].contains(Lstate[m])==true ){
Lsatateconvereted[x]=converted[d][0];
x++;
break;
}
}
}
i=0;
while (converted[i][0]!=null) {
i++;
sum=i;
}
}
public void LandaTrance(){
for(p=0;p<100;p++){
check[p]=0;
}
int k=0;
h=i;
int flag=0;
String htc=null;
//htc=htc+converted[h][0];
htc=htc+dfa[h][0];
//converted[h][1]=converted[h][1]+dfa[h][1];
while(search(htc,"#")!=not){
for (int j=0;j<100;j++){
if (check[j]==t)
flag=1;
}
if(flag==1)
break;
htc=search(htc,"#");
check[p]=t;
p++;
h++;//che taasiri dare ke h ezafe beshe ?
k++;
}
for(int g=0;g<=k ;g++)
converted[i][0]= converted[i][0]+dfa[check[g]][0];
}
//*******************************************************************
public String search(String q,String s){
for(t=0;t<100 && dfa[t][0]!=null ;t++)
{
if(dfa[t][0].compareTo(q)==0 && dfa[t][1].compareTo(s)==0)
return dfa[t][2];
}
return not;
}
//*****************************************************************
//public String searchDfa(String q){
// for (int l=0;l<=100;l++)
//{
// if (converted[l][2].compareTo(q)==0)
// return converted[l][2];
//}
//return not;
//}
//*******************************************************************
public void OutputFile( )throws FileNotFoundException, IOException{
File file=new File("output.txt");
FileWriter out=new FileWriter(file);
out.write(converted[0][0]);
for (int i = 1; i<converted.length && converted[i][0]!=null; i++) {
out.write(","+converted[i][0]);
}
out.write(";\n");
out.write(Alpha[0]);
for (int i = 1; i < Alpha.length && Alpha[i]!=null; i++) {
out.write(","+Alpha[i]);
}
out.write(";\n");
out.write(converted[0][0]);
out.write(";\n");
out.write(Lsatateconvereted[0]);
for (int i = 1; i < Lsatateconvereted.length && Lsatateconvereted[i]!=null; i++) {
out.write(","+ Lsatateconvereted[i]);
}
out.write(";\n");
out.write(sum);
out.write(";\n");
for (int i = 0; i < sum; i++) {
out.write(converted[i][0]+","+converted[i][1]+","+converted[i][2]);
out.write(";\n");
}
out.flush();
out.close();
}
}/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package nfa2dfa;
import java.io.*;
import java.util.*;
/**
*
* @author ahangari
*/
public class Main {
/**
* @param args the command line arguments
*/
//delimiter
// Reader inp=new FileReader("nfa.txt");
public static void main(String[] args) throws IOException, ClassNotFoundException {
//******************************************************
// TODO code application logic here
NfaToDfa n2d=new NfaToDfa();
// File f = new File("input.txt");
// System.out.println(f.getAbsolutePath());
n2d.inputfile();
n2d.converter();
n2d.OutputFile();
}
}Exception in thread "main" java.lang.NullPointerException
java.util.NoSuchElementException: No line foundread exception
at java.io.Writer.write(Writer.java:140)
at nfa2dfa.NfaToDfa.OutputFile(NfaToDfa.java:236)
What variable is null on line 236? Find the variable and make sure it has a valid value before trying to use it.
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