Question

The application should be in JAVA and allow:

1. Collect student information and store it in a binary data file. Each student is identified by an unique ID. The user should be able to view/edit an existing student. Do not allow the user to edit student ID.

2. Collect Course information and store it in a separate data file. Each course is identified by an unique ID. The user should be able to view/edit an existing course information. User is not allowed to edit the key field such as Course ID.

3. Collect Enrollment information. Here you allow the user to enroll students to courses. You make sure that the user types valid student id and course ID. You display the student and course information in the window. You will have to store enrollment information in a separate binary file. This file may contain the course, student ID, Year and semester information.

4. Grade Management, such as Add grades, View Grades. You will allow the user to enter student ID, year, Semester, course ID, and the grade. The user should be above to view/edit the grades.

You can create a menu driven interface to select the above options.

Answer 1

Solution:

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;

class Frame1 extends Frame implements ActionListener
{
    String msg="";
    Button btnNew,btnSubmit,btnView;
    Label lblName,lblAge,lblAddr,lblGender,lblQua,unique_id,grade;
    TextField txtName,txtAge,txtgrade;
    TextArea txtAddr,txtAns;
    CheckboxGroup ChkGrp;
    Checkbox chkMale,chkFemale;
    Checkbox chkMca,chkBca,chkBba,chkMba;

     Frame1(String name)
    {  
        super(name);
        setLayout(new GridLayout(3,2));

        lblName = new Label("Name: ");
        lblAge = new Label("Age: ");
        lblAddr = new Label("Address : ");
        lblGender = new Label("Gender: ");
        lblQua = new Label("Qualification: ");
        unique_id = new Label("unique_id: ");
        grade = new Label("Grade: ");
        txtName = new TextField(20);
        txtAge = new TextField(20);
        txtAddr = new TextArea();
        txtgrade = new TextArea();
        ChkGrp = new CheckboxGroup();
        chkMale = new Checkbox("Male",ChkGrp,false);
        chkFemale = new Checkbox("Female",ChkGrp,false);
        chkMca = new Checkbox("MCA");
        chkBca = new Checkbox("BCA");
        chkMba = new Checkbox("MBA");
        chkBba = new Checkbox("BBA");
        btnNew = new Button("NEW");
        btnSubmit = new Button("SUBMIT");
        btnView = new Button("VIEW");
      
        btnNew.addActionListener(this);
        btnSubmit.addActionListener(this);
        btnView.addActionListener(this);

        add(lblName);
        add(txtName);
        add(lblAge);
        add(txtAge);
        add(lblAddr);
        add(txtAddr);
        add(unique_id);
        add(grade);
        add(lblGender);
        add(chkMale);
        add(chkFemale);
        add(lblQua);
        add(chkBca);
        add(chkBba);
        add(chkMca);
        add(chkMba);
  
        add(btnNew);
        add(btnSubmit);
        add(btnView);
      
        txtAns = new TextArea();
        add(txtAns);
      
    }  
      
    publicvoid 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=txtName.getText().trim();
                dos.writeUTF(s);
          
                dos.writeInt(Integer.parseInt(txtAge.getText()));

                s=txtAddr.getText();
              
                dos.writeUTF(s);
                if(chkMale.getState())
                    dos.writeUTF("Male ");
                if(chkFemale.getState())
                    dos.writeUTF("Female ");

                s="";                  
                if(chkMca.getState())
                    s="MCA ";  
                              
                if(chkBca.getState())
                    s+="BCA ";                      

                if(chkBba.getState())
                    s+="BBA ";  
                  
                if(chkMba.getState())
                    s+="MBA ";  
                  
                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(txtName.getText().trim()))
                      {
                        txtAge.setText(age+"");                  
                        txtAddr.setText(addr);
                        if(gender.equals("Male "))
                            chkMale.setState(true);
                        else
                            chkFemale.setState(true);
                        while(qual.charAt(i)!='!')
                        {
                            j=qual.indexOf(' ');
                            tmp = qual.substring(i,j);
  
                            if(tmp.equals("MCA"))
                                chkMca.setState(true);                  

                            if(tmp.equals("BCA"))
                                chkBca.setState(true);                  

                            if(tmp.equals("BBA"))
                                chkBba.setState(true);                  

                            if(tmp.equals("MBA"))
                                chkMba.setState(true);
                            i=j+1;
                        }
                        break;
                    }
                }
                Fin.close();  
            }

            if(str.equals("NEW"))
            {
                txtName.setText("");
                txtAge.setText("");                  
                txtAddr.setText("");
                txtGrade.setText("");
                chkMale.setState(false);
                chkFemale.setState(false);
                chkMca.setState(false);                  
                chkBca.setState(false);                  
                chkBba.setState(false);                  
                chkMba.setState(false);
            }
        }
        catch(Exception e)
        {
            System.out.println("The Exception Is : " +e);
        }

    }

}

class student
{

    public static void main(String args[])
    {
        try{
        Frame1 F = new Frame1("student");
        F.setSize(400,400);
        F.show();
        }catch(Exception e)
        {
            System.out.println(e);
        }
    }  

}