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Thread: Java Student Record System Problem

  1. #1
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    Question Java Student Record System Problem

    I have written a program student record system but can not save data to view or submit record.
    Able to run the program but failed to submit record or view pre-submitted records.
    Student.java
    import java.io.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.applet.*;
     
    class Student extends Frame implements ActionListener
    {
        String greeding="";
        Button btnNewStudent;
        Button btnSubmit;
        Button btnView;
        Label lblStudentName;
        Label lblStudentAge;
        Label lblStudentAddr;
        Label lblStudentGender;
        Label lblProgram;
        TextField txtStudentName;
        TextField txtStudentAge;
        TextArea txtStudentAddr;
        TextArea txtAns;
        CheckboxGroup ChkGrp;
        Checkbox chkMale,chkFemale;
        Checkbox chkGameDesign,chkComputerStudies,chkHotelManagement,chkArtAndDesign;
         Student(String Studentname)
        {  
            super(Studentname);
            setLayout(new GridLayout(3,2));
     
            lblStudentName = new Label("Name: ");
            lblStudentAge = new Label("Age: ");
            lblStudentAddr = new Label("Address : ");
            lblStudentGender = new Label("Gender: ");
            lblProgram = new Label("Qualification: ");
            txtStudentName = new TextField(20);
            txtStudentAge = new TextField(20);
            txtStudentAddr = new TextArea();
            ChkGrp = new CheckboxGroup();
            chkMale = new Checkbox("Male",ChkGrp,false);
            chkFemale = new Checkbox("Female",ChkGrp,false);
            chkGameDesign = new Checkbox("Game Design");
            chkComputerStudies = new Checkbox("Computer Studies");
            chkHotelManagement = new Checkbox("Hotel Management");
            chkArtAndDesign = new Checkbox("Art and Design");
            btnNewStudent = new Button("NEW");
            btnSubmit = new Button("SUBMIT");
            btnView = new Button("VIEW");
     
            btnNewStudent.addActionListener(this);
            btnSubmit.addActionListener(this);
            btnView.addActionListener(this);
     
            add(lblStudentName);
            add(txtStudentName);
            add(lblStudentAge);
            add(txtStudentAge);
            add(lblStudentAddr);
            add(txtStudentAddr);
            add(lblStudentGender);
            add(chkMale);
            add(chkFemale);
            add(lblProgram);
            add(chkGameDesign);
            add(chkComputerStudies);
            add(chkHotelManagement);
            add(chkArtAndDesign);
     
            add(btnNewStudent);
            add(btnSubmit);
            add(btnView);
     
            txtAns = new TextArea();
            add(txtAns);
     
        }  
     
        public void actionPerformed(ActionEvent ae)
        {
            String s="";
            boolean b;
            FileInputStream Fin;
            DataInputStream dis;
            FileOutputStream Fout;
            DataOutputStream dos;
     
            try
            {
                Fout = new FileOutputStream("Biodata.txt",true);
                dos = new DataOutputStream(Fout);
     
                String str = ae.getActionCommand();
                if(str.equals("SUBMIT"))
                {
     
                    s=txtStudentName.getText().trim();
                    dos.writeUTF(s);
     
                    dos.writeInt(Integer.parseInt(txtStudentAge.getText()));
     
                    s=txtStudentAddr.getText();
     
                    dos.writeUTF(s);
                    if(chkMale.getState())
                        dos.writeUTF("Male ");
                    if(chkFemale.getState())
                        dos.writeUTF("Female ");
     
                    s="";                  
                    if(chkGameDesign.getState())
                        s="Game Design ";  
     
                    if(chkComputerStudies.getState())
                        s+="Computer Studies ";                      
     
                    if(chkHotelManagement.getState())
                        s+="Hotel Management ";  
     
                    if(chkArtAndDesign.getState())
                        s+="Art And Design ";  
     
                    s+="!";
                    dos.writeUTF(s);
                    Fout.close();
                }
     
                if(str.equals("VIEW"))
                {
                    String tmp,name,addr,gender,qual;
                    int age;
                    Fin = new FileInputStream("Biodata.txt");
                    dis = new DataInputStream(Fin);
     
     
                    int i=0,j;
     
                    while(Fin.available()>0)
                    {
                        name = dis.readUTF();
                        age  = dis.readInt();
                        addr = dis.readUTF();
                        gender = dis.readUTF();
                        qual = dis.readUTF();
     
                        if(name.equals(txtStudentName.getText().trim()))
                          {
                            txtStudentAge.setText(age+"");                  
                            txtStudentAddr.setText(addr);
                            if(gender.equals("Male "))
                                chkMale.setState(true);
                            else
                                chkFemale.setState(true);
                            while(Program.charAt(i)!='!')
                            {
                                j=qual.indexOf(' ');
                                tmp = qual.substring(i,j);
     
                                if(tmp.equals("Game Design"))
                                    chkGameDesign.setState(true);                  
     
                                if(tmp.equals("Computer Studies"))
                                    chkComputerStudies.setState(true);                  
     
                                if(tmp.equals("Hotel Management"))
                                    chkHotelManagement.setState(true);                  
     
                                if(tmp.equals("Art And Design"))
                                    chkArtAndDesign.setState(true);
                                i=j+1;
                            }
                            break;
                        }
                    }
                    Fin.close();  
                }
     
                if(str.equals("NEW"))
                {
                    txtStudentName.setText("");
                    txtStudentAge.setText("");                  
                    txtStudentAddr.setText("");
                    chkMale.setState(false);
                    chkFemale.setState(false);
                    chkGameDesign.setState(false);                  
                    chkComputerStudies.setState(false);                  
                    chkHotelManagement.setState(false);                  
                    chkArtAndDesign.setState(false);
                }
            }
            catch(Exception e)
            {
                System.out.println("The Exception Is : " +e);
            }
     
        }
     
    }

    Record.java
    class Record
    {
     
        public static void main (String args[])
        {
            try{
            Student F = new Student("Record");
            F.setSize(400,400);
            F.show();
            }catch(Exception e)
            {
                System.out.println(e);
            }
        }  
     
    }


  2. #2
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    Default Re: Java Student Record System Problem

    You need to narrow your problem down further. Where is the code that saves the data? Can you isolate it into an SSCCE that demonstrates the problem? Have you tried stepping through this with a debugger or by hand, or just adding print statements to figure out when the program's execution differs from your expectations?
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  3. #3
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    Default Re: Java Student Record System Problem

    Actually the only problem is everything works except the New, Submit and View Button.Screen Shot 2014-02-19 at 10.09.56 PM.jpg

  4. #4
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    Default Re: Java Student Record System Problem

    Okay, cool. And have you narrowed your problem down into an SSCCE for each button? Have you stepped through the code for each button? Where does the program's execution for each button differ from what you'd expect?
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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  5. #5
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    Default Re: Java Student Record System Problem

    After typing the data and click submit or new to clear the page I get this error on Java Console:
    "Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problem:
    Program cannot be resolved

    at Student.actionPerformed(Student.java:151)
    at java.awt.Button.processActionEvent(Button.java:392 )
    at java.awt.Button.processEvent(Button.java:360)
    at java.awt.Component.dispatchEventImpl(Component.jav a:4776)
    at java.awt.Component.dispatchEvent(Component.java:46 04)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:717)
    at java.awt.EventQueue.access$400(EventQueue.java:82)
    at java.awt.EventQueue$2.run(EventQueue.java:676)
    at java.awt.EventQueue$2.run(EventQueue.java:674)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:86)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:690)
    at java.awt.EventQueue$3.run(EventQueue.java:688)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:86)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java: 687)
    at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:296)
    at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:196)
    at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:188)
    at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:122)"

  6. #6
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    Default Re: Java Student Record System Problem

    That means you have a compilation error. This is not a runtime error. You can get the compiler error by running javac on your java file. If you don't know how to get to a compiler error in an IDE yet, you shouldn't be using an IDE. Use the command line instead.

    But since that advice is almost always ignored, your IDE is probably telling you about the compiler error. Look for red squiggly lines on the line in questions.
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