Reading A String From A File

Question

Having Difficulties Parsing a file for specific information. How do you either convert a int (from the read class) to a stream or how do you read a stream directly from a file?
Also need to know how can ensure that tags within an XML document do not overlap...
any help is appreciated -- thank you...
import java.io.*;
     public class Check
     public static void main(String[] args) throws IOException
          if (args.length != 1)
               System.out.println("JAVA Check <doc.xml>");
               return;
          String fileName;
          fileName = args[0];
          if (fileName.endsWith(".xml"))
               System.out.println("THE FILE IS A VALID XML FILE");
               else
               System.out.println("NOT A VALID XML FILE");
          File inFile=new File(args[0]);
          FileReader fr=new FileReader(inFile);
          File outFile=new File(args[0]);
          FileWriter fw=new FileWriter(outFile);
          String frontopentag = "<";
               Check fot=new Check();
               int countfrontopentag = 0;
          String frontclosetag = "</";
               Check fct=new Check();
               int countfrontclosetag = 0;
          String backclosetag = ">";
               Check bct=new Check();
               int countbackclosetag = 0;
          int c=0;
          c=fr.read();
          while (c != -1)
               fw.write(c);
               c=fr.read();
                    if (fot.equals("<"))
                    ++countfrontopentag;
                    return;
                    if (fct.equals("</"))
                    ++countfrontclosetag;
                    return;
                    if (bct.equals(">"))
                    ++countbackclosetag;
                    return;
                    if (countfrontopentag != countfrontclosetag)
                    System.out.println("CHECK THAT THE OPENING OF THE TAGS ARE BALANCED, '<...' AND '</...'");
                    else
                    System.out.println("OPENING TAGS ARE BALANCED, '<...' AND '</...'");
                    if(countbackclosetag%2 == 0)
                    System.out.println("CLOSING TAGS ARE BALANCED, '...>'");
                    else
                    System.out.println("CHECK THAT THE CLOSING TAGS ARE BALANCED, '...>'");
                    if((2*countbackclosetag) != countfrontopentag)
                    System.out.println("CHECK THAT THE NUMBER OF '<...' AND '</...' EQUALS THE NUMBER OF CLOSING TAGS, '...>'");
                    else
                    System.out.println("THE NUMBER OF '<...' AND '</...' EQUALS THE NUMBER OF CLOSING TAGS, '...>'");
          fr.close();
          fw.close();
          } //close main
     } //close class

Answer 1

Well... I have no idea of how much java you know, so please forgive me if I state something you already know by heart.
your best bet for the integer is reading by characters,
testing them, (Character.isDigit(a valid character)) and the Character.digit(char ch, int radix) method.
char ch;
forloop
ch = aString.charAt(i);
if (Character.isDigit(ch))
while your best bet for overlapping brackets and such would be to use a number, and add to it whenever there is a left-hand bracket, and subtract from it, whenever there is a right-hand bracket. or use a stack to save the characters within the brackets and then, whenever you find a right-hand bracket, evaluate the string up to the point of the last left-hand bracket.