can some one help me im just new in java.

[francis sumaylo]

i have a problem on my program i dont know how to do, every time i run the program and try to input records after i save it the program stops and before continue a need to run it again. is there any suggestion what to do? help me please im having a headache with this.

import javax.swing.JOptionPane;

import java.awt.HeadlessException;
import java.io.*;


public class Registration {

public static String StudentNo;
public static String FirstName;
public static String MiddleName;
public static String SurName;
public static String Sector;
public static String LandLine;
public static String Mobile;
public static int Payment = 0;
public static String Schedule = "";

	/**
	 * @param args
	 * @throws IOException 
	 * @throws HeadlessException 
	 */
	public static void main(String[] args) throws HeadlessException, IOException {
		// TODO Auto-generated method stub
		
			String Username = JOptionPane.showInputDialog("Username: ");
			String Password = JOptionPane.showInputDialog("Password: ");
			if (Username.equals("") || Password.equals("")){
				JOptionPane.showMessageDialog(null,"Please enter username and password.");
			}
			else
			{
				if (Username.equals("isko") && Password.equals("sumaylo")) {
				String Options2 = JOptionPane.showInputDialog("Enrollment System Menu\n\n[1] Add Record\n[2] View Record\n[3] View All\n[4] Edit Record\n[5] Delete Record\n[6] Close/Exit");
				int i2 = Integer.parseInt(Options2);
				if (i2 == 1){ // Add Record
					// Save Record
					Save("Save");
				}
				else if (i2 == 2){ // View Record
					String StudNo = JOptionPane.showInputDialog("Student No:\n");
					File Filename = new File(StudNo + ".txt");
					if (Filename.exists()){
						String[] array = getContents(Filename).split(",");
						JOptionPane.showMessageDialog(null, "Student No: " + array[0].toString() + "\nFirst Name: " + array[1].toString() + "\nMiddle Name: " + array[2].toString()  + "\nLast Name: " + array[3].toString()  + "\nLandline: " + array[4].toString()  + "\nMobile: " + array[5].toString()  + "\nSector: " + array[6].toString()  + "\nPayment: " + array[7].toString());
					}
					else
					{
						JOptionPane.showMessageDialog(null, "No Record Found");
					}
					
				}
				else if (i2 == 3){ //View All
					JOptionPane.showMessageDialog(null,readAllFiles());
				}
				else if (i2 == 4){ // Edit Record
					String StudNo = JOptionPane.showInputDialog("Student No:\n");
					File Filename = new File(StudNo + ".txt");
					if (Filename.exists()){
						String[] array = getContents(Filename).split(",");
						FirstName = array[1].toString();
						MiddleName = array[2].toString();
						SurName = array[3].toString();
						LandLine = array[4].toString();
						Mobile = array[5].toString();
						Sector = array[6].toString();
						if (Sector.equals("Government")){
							Sector = "G";
						}
						else if (Sector.equals("Private")){
							Sector = "P";
						}
						//Payment = Integer.parseInt(array[7].toString());
						Save(StudNo);
					}
					else
					{
						JOptionPane.showMessageDialog(null, "No Record Found");
					}
				}
				else if (i2 == 5){ // Delete Record
					String StudNo = JOptionPane.showInputDialog("Student No:\n");
					File Filename = new File(StudNo + ".txt");
					if (Filename.exists()){
						int result = JOptionPane.showConfirmDialog(null, "Are you sure to delete the record?", "Delete", 2);
						if (result == 0) {
							Filename.delete();
						}						
					}
					else
					{
						JOptionPane.showMessageDialog(null, "No Record Found");
					}
				}
				else if (i2 == 6){ // Close/Exit Record
					System.exit(0);
				}
			}
			else{
				JOptionPane.showMessageDialog(null,"Login Failed...");
			}	
			}
			
		
	}

	// Login
	
	// Functions
	// Validation
	public static String IsValid(String mode){
		String Status = "" ; 
		String StudNo = "" ;
		String Fname = "" ;
		String Mname = "" ;
		String Sname = "" ;
		String GovPriv = "";
		String Phone = "";
		String CP = "";
		String Sched = "";
		if (mode.equals("Save")){
			StudNo =  JOptionPane.showInputDialog("Enter Student Number: ");
			Fname = JOptionPane.showInputDialog("Enter Student First Name: ");
			Mname = JOptionPane.showInputDialog("Enter Student Middle Name: ");
			Sname = JOptionPane.showInputDialog("Enter Student Last Name: ");
			GovPriv = JOptionPane.showInputDialog("Sector\n\n[G] Government\n[P] Private: ");
			Phone = JOptionPane.showInputDialog("Enter Landline Number: ");
			CP = JOptionPane.showInputDialog("Enter Mobile Number: ");
			Sched = JOptionPane.showInputDialog("Schedule:\n\n[AM] Morning\n[NN] Noon\n[PM] Afternoon");
		}
		else
		{
			StudNo = mode;
			Fname = JOptionPane.showInputDialog("Enter Student First Name: ",FirstName);
			Mname = JOptionPane.showInputDialog("Enter Student Middle Name: ",MiddleName);
			Sname = JOptionPane.showInputDialog("Enter Student Last Name: ",SurName);
			GovPriv = JOptionPane.showInputDialog("Sector\n\n[G] Government\n[P] Private: ",Sector);
			Phone = JOptionPane.showInputDialog("Enter Landline Number: ",LandLine);
			CP = JOptionPane.showInputDialog("Enter Mobile Number: ",Mobile);
			Sched = JOptionPane.showInputDialog("Schedule:\n\n[AM] Morning\n[NN] Noon\n[PM] Afternoon","Schedule");
		}
		
		StudentNo = StudNo;
		
		if (countchar(Fname) > 25) {
			Status = Status + "First Name exceeds 25 Characters. \n";
		}
		else {
			// Save FirstName
			FirstName = Fname;
		}
		if (countchar(Mname) > 25) {
			Status = Status + "Middle Name exceeds 25 Characters. \n";
		}
		else {
			// Save MiddleName
			MiddleName = Mname;
		}
		if (countchar(Sname) > 25) {
			Status = Status + "Last Name exceeds 25 Characters. \n";
		}
		else {
			// Save Surname
			SurName = Sname;
		}
		
		int pay = payment(GovPriv);
		if (pay > 0) {
			//Save GovPriv Value
			if (GovPriv.equals("G")){
				Sector = "Government";
			}
			else if (GovPriv.equals("P")){
				Sector = "Private";
			}
			//Save payment Value
			Payment = pay;
		}
		else if (payment(GovPriv) == 0){
			Status = Status +  "G and P is the only character accepted. \n";
		}
		
		if (IsNumeric(Phone)){
			// Save Phone
			LandLine = Phone;
		}
		else
		{
			Status = Status +  "Landline: Invalid character found. \n";
		}
		if (IsNumeric(CP)){
			// Save Mobile
			Mobile = CP;
		}
		else
		{
			Status = Status +  "Mobile: Invalid character found. \n";
		}
		
		if (Sched.equals("AM") || Sched.equals("NN") || Sched.equals("PM")){
			Schedule = Sched;
		}
		else {
			Status = Status +  "Invalid schedule format. \n";
		}
		
		if (Status.equals("")){
		Status = "PASSED";
		}
		return Status;
	}
	
	// ================================================================================================================
	public static int countchar(String args){
		int i = 0;
		String fname = args;
		// count
		i = fname.length();
		return i;
	}
	
	// ================================================================================================================
	public static int payment(String a){
		int i = 0;
		
		if (a.length() > 1 || a.length() == 0){
			JOptionPane.showMessageDialog(null,"Only 1 Character is accepted.");
		}
		else {
			if (a.equals("G")){
				i = 6300;
			}
			else if (a.equals("P")){
				i = 7800;
			}
			else {
				i = 0;
			}	
		}
		return i;
	}
	
	// ===============================================================================================================
	public static boolean IsNumeric(String strString)
	   //  check for valid numeric strings	
	   {
	   String strValidChars = "0123456789.+";
	   char strChar;
	   boolean blnResult = true;

	   if (strString.length() == 0){
		   blnResult = false;
	   }

	   //  test strString consists of valid characters listed above
	   for (int i = 0; i < strString.length() && blnResult == true; i++)
	      {
	      strChar = strString.charAt(i);
	      if (strValidChars.indexOf(strChar) == -1)
	         {
	         blnResult = false;
	         }
	      }
	   return blnResult;
	   }
	
	public static String SaveToText(String details) throws IOException{
		/*
		 * Note: throws IOException is needed if you are in file manipulation
		 *      You also need to type this to public static void main()
		 *Example:
		 *      public static void main(String[] args) throws HeadlessException, IOException {
		 */
		
		
		File f = new File(StudentNo + ".txt");
	    FileOutputStream fop = new FileOutputStream(f);
	    if(f.exists())
	      {
	    	  String str = details;
	          fop.write(str.getBytes());

	          fop.flush();
	          fop.close();
	          return "Successful";
	      }
	    else {
	        	return "Failed";
	         }
	}

	public static void Save(String mode) throws IOException {
		if (IsValid(mode).equals("PASSED")){
			//Show Record
			String Record = "StudentNo"+ StudentNo + "\nFirst Name: " + FirstName + "\nMiddle Name: " + MiddleName + "\nLast Name: " + SurName + "\nLandline: " + LandLine + "\nMobile: " + Mobile + "\nSector: " + Sector + "\nPayment: " + Payment + "\nSchedule: " + Schedule;
			int result = JOptionPane.showConfirmDialog(null,
					"Student Record\n\n" + Record,
					"Save", 2);
			if (result == 0){
				String delimeter = ",";
				String Details = StudentNo + delimeter+ FirstName +  delimeter + MiddleName + delimeter + SurName + delimeter + LandLine + delimeter + Mobile + delimeter + Sector + delimeter + Payment + delimeter + Schedule;
				JOptionPane.showMessageDialog(null, SaveToText(Details));
			}
			else{
				JOptionPane.showMessageDialog(null, "Record is not saved.");
			}
		}
		else
		{
			JOptionPane.showMessageDialog(null, IsValid(mode));
		}
	}
	
	static public String getContents(File aFile) {
	    StringBuilder contents = new StringBuilder();
	    try {
	      BufferedReader input =  new BufferedReader(new FileReader(aFile));
	      try {
	        String line = null;
	        while (( line = input.readLine()) != null){
	          contents.append(line);
	          contents.append(System.getProperty("line.separator"));
	        }
	      }
	      finally {
	        input.close();
	      }
	    }
	    catch (IOException ex){
	      ex.printStackTrace();
	    }
	    
	    return contents.toString();
	  }
	
	public static String readAllFiles(){
		// Get all files from the main directory
		// Read each file and insert it in a StringBuilder
		// Display StringBuilder in a JOptionPane Message Box
		StringBuilder sb = new StringBuilder();
		File dir = new File("C:\\Documents and Settings\\Administrator\\My Documents\\JCreator LE\\MyProjects\\Registration\\Registration\\src");
        File[] files = dir.listFiles();
        for (int i = 0; i < files.length; i++) //null pointer here
        {
            String fileName = files[i].getName();
            if(fileName.endsWith(".txt"))
            {
            	File sFile = new File(fileName);
            String[] array = getContents(sFile).split(",");
           sb.append("========================================================================================");
           sb.append("\nStudent No: " + array[0].toString());
           sb.append(", First Name: " + array[1].toString());
           sb.append(", Middle Name: " + array[2].toString());
           sb.append(", Last Name: " + array[3].toString());
           sb.append(", Landline: " + array[4].toString());
           sb.append(", Mobile: " + array[5].toString());
           sb.append(", Sector: " + array[6].toString());
           sb.append(", Payment: " + array[7].toString());
           sb.append(", Schedule: " + array[8].toString() + "\n");
            }
        }
        return sb.toString();
	}
}

[Christophe Verré]

Welcome to the ranch The next time you post some code, please UseCodeTags.

[Christophe Verré]

It looks like you need some sort of loop, like while(i2 != 6) or while(true).