Appending data in file ?

Question

Hi,
I have a question. I'm trying to append data in a file. But it is not ? I don't know why it is not appending. Can you please look at my code.
Here what am i doing that calling different methods in the child class from parent class by giving different options. Here i'm giving input from the commandline.
here is my sample code
import java.io.*;
public class AppendFile{
    public static void main(String[] args) throws IOException,EOFException
     try{
        // creating file and appending data
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            PrintWriter out = new PrintWriter( new FileWriter("out.txt",true));
        ClassA a = new ClassA(out);
        for(;;)
          System.out.println("Enter no :");
          int number = Integer.parseInt(in.readLine());
          out.println(" ENTER NUMBER FROM CATALOG : "+number);
          if ( number == 1)
              a.method1(); // calling ClassA - method1
          }else if( number == 2)
              a.method2();  // calling ClassA - method2
          }else
           System.exit(-1);
           out.close();  // closing PrintWriter out
       }catch(EOFException eofe)
        System.out.println(" "+eofe);
       catch(IOException ioe)
         System.out.println(" "+ioe);
// child class
class ClassA{
    PrintWriter out;
    public ClassA(PrintWriter out1)
      out = out1;
    public void method1()
       System.out.println(" ClassA- method1");
       out.println(" ClassA- method1");
    public void method2()
       System.out.println(" ClassA- method2");
       out.println(" ClassA- method2");
}Can you please look at code and give suggestions to me.
Thank you,
-balaji

Answer 1

You should try your own code.
Here is an example that could work, with minor changes on your original code above.
import java.io.*;
public class AppendFile{
public static void main(String[] args){
  BufferedReader in=null;
  PrintWriter out=null;
try{
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter( new FileWriter("out.txt",true));
   ClassA a = new ClassA(out);
   for(;;){
          System.out.println("Enter no :");
          int number = Integer.parseInt(in.readLine());
          out.println(" ENTER NUMBER FROM CATALOG : "+number);
          if ( number == 1) {
              a.method1();
          }else if( number == 2){
              a.method2();
          }else{
            throw new IllegalArgumentException("input has unexpected values");
        }//end of for
       }catch(EOFException eofe) {
        System.err.println(" "+eofe);
       }catch(IOException ioe){
         System.err.println(" "+ioe);
       }catch(IllegalArgumentException argex){
         System.err.println(argex.getMessage());
       }finally{
        System.out.println("Reader ane Writer will be closed");// testing output
        try{
           if(in!=null) in.close();
           if(out!=null) out.close();
        }catch(IOException ioe){;}
    }