Thread: Reading the data from DataInputStream . help :(

import javax.swing.JOptionPane;
import java.util.*;
import java.io.*;
import java.lang.Exception.*;
public class FinalNaTlga
{
		static Scanner input = new Scanner (System.in);
		static final int PASSWORD = 1234;
		static final int DONE = 143;
		static final int EOF = -1;
 
		public static void main (String [] args) throws FileNotFoundException,IOException, EOFException
		{
				DataOutputStream stream = new DataOutputStream(new FileOutputStream("Merchandise.dat"));
				DataInputStream stream1 = new DataInputStream ( new FileInputStream ("Merchandise.dat.tmp"));
 
				String s1 = "LBC";
				String s2 = "JRS_Express";
				String s3 = "MoneyGram";
				String s4 = "Western_Union";
				String choice, pcat = "", pname = "", mode, pay = "", pay2 = "";
				int select, pass = 0,pass1,  pcode = 0, q = 1, chc2 = 0, num = 0, x = 0, y = 0, z =0, xx = 0;
				char chc, md;
				double pprice;
 
			try {
 
				System.out.print(" \n++ WELCOME TO SUPER ELF MERCH ++ ");
				System.out.println(" \n===================================");
 
			     do {
				System.out.print("\nChoose user: \n\n[1] SHOP OWNER\n[2] BUYER\n>>> ");
				select = input.nextInt();
 
				if ( select == 1)
				{
						System.out.print("\n ** SECURITY CHECK **" + "\nEnter security password: ");
						pass = input.nextInt();
 
						if ( pass != PASSWORD)
						{	
								System.out.print("\nInvalid password.");
								pass1 = 1;
						}
						else
						{
						 System.out.print("\n=============================\nHi Shopkeeper! Good day ! ^^\n=============================");
				do {
					System.out.print("\n\nWhat would you like to do this time?" + "\n[a] ADD INVENTORY" + "\n[b] MANAGE SALES" + "\n[c] EXIT");
					System.out.print("\n>>> ");
					input.nextLine();
				        choice = input.nextLine();
					chc = choice.charAt(0);
					pass1 = 0;
 
								switch (chc)
								{
								case 'a':case'A':	
		//in this part, data here is entered and written through the data streams
								System.out.print("\nINVENTORY");
								do {
								System.out.print("\nPress Enter to continue :) ");
								input.nextLine();
								System.out.println("\n++++++++++++++");
 								System.out.print("\nEnter product code or " + DONE + " to quit: ");
 								while (!input.hasNextInt())
									{
									System.out.println("\nInvalid data type!");
									System.out.print("\nEnter product code or " + DONE + " to quit. >> ");
									input.next();
									}
								pcode = input.nextInt();
								while (pcode != DONE)
								{
								   input.nextLine();
								   System.out.print("Enter category: ");
								   pcat = input.nextLine();
								   System.out.print("Enter product name: ");	
								   pname = input.nextLine();
								   System.out.print("Enter product price: ");	
								   pprice = input.nextDouble();
 
								stream.writeUTF(pcat);
								stream.writeInt(pcode); 
							        stream.writeUTF(pname); 
							        stream.writeDouble(pprice);
 
								System.out.print("\nEnter product code or " + DONE + " to quit: ");
 
												while (!input.hasNextInt())
												{
												System.out.println("\nInvalid data type!");
												}
												pcode = input.nextInt();
											} 
											stream.close();	
			q =  JOptionPane.showConfirmDialog(null,"Do you want to continue?","SELECT",JOptionPane.YES_NO_OPTION);
										} while ( q != JOptionPane.NO_OPTION);	
											break;
 
	                                             case 'b':case'B':  
//through here the data entered in case a, should be shown here. but in my case, it only shows null.                    	 
	                                             	System.out.println("\nSALES\n\nCATEGORY\tPRODUCT NAME\t     PRODUCT CODE\tPRICE");										                                                                             System.out.println("======================================================================");
											while ((pcode = stream1.readInt()) != EOF)
											{
												pcat = stream1.readUTF();
												pname = stream1.readUTF();	
												pprice = stream1.readDouble();						
												stream.writeInt(pcode);
												stream.writeUTF(pcat);
												stream.writeUTF(pname); 
												stream.writeDouble(pprice);			
 
								System.out.println(pcode+ "\t\t" + pcat + "\t\t" + pname + "\t\t" + pprice);				
											}
											stream1.close();
											break;
									     case 'c':case'C':
											break;
									     default:
											System.out.print("");	
								} z = JOptionPane.showConfirmDialog(null,"Do you want to go back to the menu?","SELECT",JOptionPane.YES_NO_OPTION); 
					} while ( z != JOptionPane.NO_OPTION);
				}
 
								File old = new File("c:\\java\\Mechandise.dat");
								File temp = new File("c:\\java\\TempMerchandise.dat");			
 
								old.delete();
								temp.renameTo(old);			
		}	pass1 = 0;
				} while (pass1 = 0;
           }
          catch (Exception e)
          {
	        System.out.print(e.getMessage());
	        stream1.close();
	        stream.close();
           }
 
      }
}

[edited]
I dont really know what's wrong.

the code here is actually a part of a code only
The thing here is, I can actually write the data. But when it comes to reading it, it only shows null

please help me . i really dont know what to do anymore .