Need Help Urgently please
i'm not a Java expert but i like to think i'm not a beginner.
I've been working on a University Project now for a week and it must be submitted tomorrow . It is a Lexical Analyzer of sorts but for some reason the program freezes and kicks out this error "java.lang.ClassNotFoundException <uncaught>"thread=main", " when i debug to find the problem. it gives no errors on compile and just freezes. i can't figure this out . if anyone can help me it would be greatly appreciated.
Below is the code
My email is : therealcarbil@gmail.com
I know the code might be a bit messy or cluttered, so i apologize ahead of time,
package components;
import java.io.Console;
import java.io.InputStreamReader;
import java.util.regex.*;
import java.lang.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
import java.util.ArrayList;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Container;
import javax.swing.*;
import javax.swing.filechooser.*;
publicclass LAextends JPanelimplements ActionListener
{
staticprivatefinal String newline ="\n";
JButton OpenButton, LexButton, ExitButton, ViewLexButton, ViewSymbolButton;
JTextArea log;
JFileChooser fc;
String Filepath="";
String Filedata="";
String Scanloc="";
int strlength=0;
String temp="";
String[] reswords={"abstract","do","if","package","synchronized","boolean",
"double","implements","private","this","break","else","enum",
"import","protected","throw","byte","extends","instanceof",
"public","throws","case","false","int","return","transient",
"catch","final","interface","short","true","char","finally",
"long","static","try","class","float","native","strictfp",
"void","const","for","new","super","volatile","continue",
"goto","null","switch","while","default","assert"};
String[] symbols={"+","-","%","/","*","_","(",")","[","]","{","}","||","&&",
"=","==","++","--","!=",">",">=","<=","<",".",",",";",":","!","<>","=>","=<","+=","-="};
String[] symident={"PLUS","MINUS","MODULUS","DIVIDE","MULTIPLY","UNDERSCORE",
"OPENING ROUND BRACKET","CLOSING ROUND BRACKET",
"OPENING SQUARE BRACKET","CLOSING SQUARE BRACKET","OPENING CURLY BRACE",
"CLOSING CURLY BRACE","OR","AND","EQUALS","INSTANCE COMPARE","INCREMENT",
"DECREMENT","NOT EQUAL","GREATER THAN","GREATER THAN OR EQUAL TO",
"LESS THAN OR EQUAL TO","LESS THAN","DOT","COMMA","SEMI-COLON","COLON","NOT","NOT EQUAL",
"EQUAL TO OR GREATER THAN","EQUAL TO OR LESS THAN","PLUS EQUALS","MINUS EQUALS"};
boolean state=false;
int i=0;
int j=0;
boolean match=false;
String LexToken="C:\\LexToken.txt";
String SymTable="C:\\SymbolT.txt";
String Lexstring="";
String SymbolTableString=" Symbol |Kind | Type \n";
ArrayList<String> wordarray=new ArrayList<String>();
String[] temparray1;
String REPat="";
public LA()
{
super(new BorderLayout());
log =new JTextArea(20,40);
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane =new JScrollPane(log);
fc =new JFileChooser();
OpenButton =new JButton("Open a File");
OpenButton.addActionListener(this);
ExitButton =new JButton("Exit");
ExitButton.addActionListener(this);
LexButton =new JButton("Analyze Lexically");
LexButton.addActionListener(this);
ViewLexButton =new JButton("View Token/Lexeme Table");
ViewLexButton.addActionListener(this);
ViewSymbolButton =new JButton("View Symbol Table");
ViewSymbolButton.addActionListener(this);
JPanel buttonPanel =new JPanel();//use FlowLayout
buttonPanel.add(OpenButton);
buttonPanel.add(LexButton);
buttonPanel.add(ViewLexButton);
buttonPanel.add(ViewSymbolButton);
buttonPanel.add(ExitButton);
add(buttonPanel, BorderLayout.PAGE_START);
add(logScrollPane, BorderLayout.CENTER);
}
publicstatic String StoreAsString(String FileName)throws Exception
{
FileInputStream fis =new FileInputStream(FileName);
int x= fis.available();
byte b[]=newbyte[x];
fis.read(b);
String content =new String(b);
return content;
}
publicstaticvoid FileWrite(String filename,String Message)throws IOException
{
try
{
FileWriter fileWriter =new FileWriter(filename);
BufferedWriter buffWriter =new BufferedWriter(fileWriter);
buffWriter.write(Message);
buffWriter.close();
fileWriter.flush();
fileWriter.close();
}
catch(IOException e)
{
System.out.println("Exception "+ e.getMessage());
}
}
publicboolean TestForResWord(int val)
{
char marker=' ';
for(i=0;i<reswords.length;i++)
{
if(reswords[i]==wordarray.get(val))
{
i=reswords.length+1;
marker='Y';
}
else
{
marker='N';
}
}
if(marker=='Y')
{
returntrue;
}
else
{
returnfalse;
}
}
publicboolean patmatch(String patstr)
{
Pattern pattern= Pattern.compile(patstr);
Matcher matcher= pattern.matcher(temparray1[j]);
boolean temp=false;
temp=matcher.find();
if (temp=true)
{
returntrue;
}
else
{
returnfalse;
}
}
publicvoid actionPerformed(ActionEvent e)
{
try
{
if (e.getSource() == OpenButton)
{
int returnVal = fc.showOpenDialog(LA.this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{
File file = fc.getSelectedFile();
Filepath =new String(file.getPath());
log.append("Opening: " + file.getName() +"." + newline);
log.append(Filepath + newline);
Filedata=StoreAsString(Filepath);
log.append(Filedata);
}
else
{
log.append("Open command cancelled by user." + newline);
}
}
elseif (e.getSource() == LexButton)
{
//int answer = JOptionPane.showConfirmDialog(null,"Are you ready to analyze Lexically?");
//if (answer == JOptionPane.YES_OPTION) // User clicked YES.
//{
log.setText("");
try
{
FileReader rd =new FileReader(Filepath);// Create the tokenizer to read from a file
StreamTokenizer st =new StreamTokenizer(rd);
int linenum=0;
int colnum=0;
st.parseNumbers();// Prepare the tokenizer for Java-style tokenizing rules
st.wordChars('_','_');
st.eolIsSignificant(true);
// If whitespace is not to be discarded, make this call
st.ordinaryChars(0,' ');
// These calls caused comments to be discarded
st.slashSlashComments(true);
st.slashStarComments(true);
// Parse the file
int token = st.nextToken();
while (token != StreamTokenizer.TT_EOF)
{
token = st.nextToken();
switch (token)
{
case StreamTokenizer.TT_NUMBER:
// A number was found; the value is in nval
double num = st.nval;
linenum=st.lineno();
temp=String.valueOf(num);
strlength=temp.length();
Lexstring=Lexstring+"\nLine : "+linenum+" |Column : "+colnum+" |Token: "+num+" |Lexeme: NUMBER";
colnum=colnum+strlength;
break;
case StreamTokenizer.TT_WORD:
// A word was found; the value is in sval
//String[] wordarray;
boolean match=false;
String word = st.sval;
int z=0;
if(z==0)
{
wordarray.add(0,word);
z++;
}
linenum=st.lineno();
char[] characters=word.toCharArray();
for(int x=0;x<characters.length;x++)
{
for (int y=0;y<symbols.length;y++)
{
String tempword="";
tempword=tempword+characters[x];
while((z>=1)&&(x<=characters.length))
{
if (tempword==symbols[y])
{
if((((characters[x]=='+')||(characters[x]=='-')||(characters[x]=='='))&&((wordarray.get(0+z-1)=="+")||(wordarray.get(0+z-1)=="-")||(wordarray.get(0+z-1)=="=")))||(tempword==wordarray.get(0+z-1))||(((tempword=="=")&&(wordarray.get(0+z-1)=="<"))||((tempword=="=")&&(wordarray.get(0+z-1)==">"))||((tempword==">")&&(wordarray.get(0+z-1)=="="))||((tempword=="<")&&(wordarray.get(0+z-1)=="="))||((tempword==">")&&(wordarray.get(0+z-1)=="<")) ) )
{
wordarray.add(0+z,wordarray.get(0+z)+characters[x]);
}
else
{
z++;//NOT SURE ABOUT THIS INCREMENT
wordarray.add(0+z,""+characters[x]);
z++;
}
}
}
}
wordarray.add(0+z,wordarray.get(0+z)+characters[x]);
}
while(state=false)
{
overhere:
for(j=0;j<wordarray.size();j++)
{
String[] temparray1=(String[])wordarray.toArray();
temp=temparray1[j];
strlength=temp.length();
if(strlength>1)
{
REPat="[\\W]";
match=patmatch(REPat);
if(match=false)
{
for(i=0;i<reswords.length;i++)
{
if(reswords[i]==wordarray.get(j))
{
String lexemestr=reswords[i].toUpperCase();
Lexstring=Lexstring+"\nLine : "+linenum+" |Column : "+colnum+" |Token: "+wordarray.get(j)+" |Lexeme: OP_"+lexemestr;
colnum=colnum+strlength;
i=reswords.length+1;
j++;
break overhere;
}
}
REPat="[(?i)[a-z][\\w*]*]";
match=patmatch(REPat);
if(match=true)
{
boolean test1=false;
test1=TestForResWord(j-1);
boolean test2=false;
test2=TestForResWord(j-2);
boolean test3=false;
test3=TestForResWord(j-3);
String[] temparray2=(String[])wordarray.toArray();
temp=temparray2[j];
strlength=temp.length();
Lexstring=Lexstring+"\nLine : "+linenum+" |Column : "+colnum+" |Token: "+temp+" |Lexeme: VARIABLE";
if(((test1==true)&&(test2==true)&&(test3==true))||((test1==true)&&(test2==true)&&(test3==false)))
{
SymbolTableString=SymbolTableString+" "+temp+" | Method | "+wordarray.get(j-1)+"\n";
}
elseif((test1==true)&&(test2==false)&&(test3==false))
{
SymbolTableString=SymbolTableString+" "+temp+" | Variable | "+wordarray.get(j-1)+"\n";
}
colnum=colnum+strlength;
i=reswords.length+1;
}
elseif(match=false)
{
String[] temparray3=(String[])wordarray.toArray();
temp=temparray3[j];
strlength=temp.length();
Lexstring=Lexstring+"\nLine : "+linenum+" |Column : "+colnum+" |Token: "+temp+" |Lexeme: INVALID_WORD";
colnum=colnum+strlength;
i=reswords.length+1;
}
}
else
{
for(i=0;i<symbols.length;i++)
{
if(symbols[i]==wordarray.get(j))
{
Lexstring=Lexstring+"\nLine : "+linenum+" |Column : "+colnum+" |Token: "+wordarray.get(j)+" |Lexeme: OP_"+symident[i];
colnum=colnum+strlength;
i=symbols.length+1;
}
}
}
}
elseif(strlength==1)
{
for(i=0;i<symbols.length;i++)
{
if(symbols[i]==wordarray.get(j))
{
Lexstring=Lexstring+"\nLine : "+linenum+" |Column : "+colnum+" |Token: "+wordarray.get(j)+" |Lexeme: OP_"+symident[i];
colnum=colnum+strlength;
i=symbols.length+1;
}
else
{
boolean test1=false;
test1=TestForResWord(j-1);
boolean test2=false;
test2=TestForResWord(j-2);
boolean test3=false;
test3=TestForResWord(j-3);
Lexstring=Lexstring+"\nLine : "+linenum+" |Column : "+colnum+" |Token: "+wordarray.get(j)+" |Lexeme: VARIABLE";
if(((test1==true)&&(test2==true)&&(test3==true))||((test1==true)&&(test2==true)&&(test3==false)))
{
SymbolTableString=SymbolTableString+" "+temp+" | Method | "+wordarray.get(j-1)+"\n";
}
elseif((test1==true)&&(test2==false)&&(test3==false))
{
SymbolTableString=SymbolTableString+" "+temp+" | Variable | "+wordarray.get(j-1)+"\n";
}
colnum=colnum+strlength;
i=symbols.length+1;
}
}
}
}
}
if(wordarray.size()>=j)
{
state=true;
}
//colnum=colnum+strlength;
break;
case'"':
// A double-quoted string was found; sval contains the contents
String dquoteVal = st.sval;
linenum=st.lineno();
strlength=dquoteVal.length();
colnum=colnum+strlength;
break;
case'\'':
// A single-quoted string was found; sval contains the contents
String squoteVal = st.sval;
linenum=st.lineno();
strlength=squoteVal.length();
colnum=colnum+strlength;
break;
case StreamTokenizer.TT_EOL:
// End of line character found
colnum=0;
break;
case StreamTokenizer.TT_EOF:
// End of file has been reached
break;
default:
// A regular character was found; the value is the token itself
char ch = (char)st.ttype;
break;
}
}
rd.close();
}
catch (IOException ex)
{
System.err.println("Exception with file! "+ex.getMessage());
}
log.append("Lexical Analysis Complete");
//}
//else if (answer == JOptionPane.NO_OPTION) // User clicked NO.
//{
//log.append("Analyze command decided against by user." + newline);
//}
//else if (answer == JOptionPane.CANCEL_OPTION) // User clicked CANCEL.
//{
//log.append("Analyze command cancelled by user." + newline);
//}
FileWrite(LexToken,Lexstring);
FileWrite(SymTable,SymbolTableString);
}
elseif (e.getSource() == ViewLexButton)
{
log.setText("");
Filedata=StoreAsString("C:\\LexToken.txt");
log.append(Filedata);
log.append("LexToken.txt has been stored at C:\\LexToken.txt");
}
elseif (e.getSource() == ViewSymbolButton)
{
log.setText("");
Filedata=StoreAsString("C:\\SymbolT.txt");
log.append(Filedata);
log.append("SymbolT.txt has been stored at C:\\SymbolT.txt");
}
elseif (e.getSource() == ExitButton)
{
System.exit (0);
}
}
catch(FileNotFoundException ex)
{
System.err.println("File not found! "+ex);
}
catch(IOException ex)
{
System.err.println("Exception with file! "+ex);
}
catch(Exception ex)
{
System.err.println("Exception with file! "+ex);
}
}
/** Returns an ImageIcon, or null if the path was invalid. */
protectedstatic ImageIcon createImageIcon(String path)
{
java.net.URL imgURL = LA.class.getResource(path);
if (imgURL !=null){
returnnew ImageIcon(imgURL);
}else{
System.err.println("Couldn't find file: " + path);
returnnull;
}
}
privatestaticvoid createAndShowGUI()
{
//Create and set up the window.
JFrame frame =new JFrame("LA");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane =new LA();
newContentPane.setOpaque(true);//content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
publicstaticvoid main(String[] args)throws IOException
{
// javax.swing.SwingUtilities.invokeLater(new Runnable()
// {
// public void run()
// {
createAndShowGUI();
// }
// });
}
}
