Student details form using java

This Java program is used for accessing student information in a Graphical User Interface format and caliculates total marks and average of the marks and it is an applet program. 

     import java.awt.*;

     import java.applet.*;

     import java.awt.event.*;

 /* <applet code="Stupanel" width=400 height=400>

    </applet> */

   

    public class Stupanel extends Applet implements    ActionListener,ItemListener

     {

             String s1,s2,s3;

             TextField t3,t4,t5,t6,t7;

             Button tot,avg;

             Checkbox c1,c2,c3,c4,m,f;

             CheckboxGroup cbg;

              Panel p1,p2,p3,p4;

              public void init()

             {

                  s3=" ";

                  tot=new Button("Total");

                  avg=new Button("Average");

                 c1=new Checkbox("MCA",true);

                 c2=new Checkbox("Msc Comp");

                 c3=new Checkbox("MSIT");

                 c4=new Checkbox("MSIS");

                 cbg=new CheckboxGroup();

                 m=new Checkbox("Male",cbg,false);

                 f=new Checkbox("Female",cbg,true);

                 p1=new Panel();

                 p1.setLayout(new GridLayout(2,2));

                 p1.add(new Label("Student Number "));

                 p1.add(new TextField(5));

                 p1.add(new Label("Student Name "));

                 p1.add(new TextField(15));

             

      add(p1);

      p2=new Panel(); p2.setLayout(new GridLayout(1,3));

      p2.add(new Label("Gender"));

      p2.add(m);

      p2.add(f);

      add(p2);  

       p3=new Panel(); p3.setLayout(new GridLayout(1,5));

       p3.add(new Label("Degree"));

       p3.add(c1);   p3.add(c2);     p3.add(c3);      p3.add(c4);

       add(p3);

        p4=new Panel(); p4.setLayout(new GridLayout(6,2));

        p4.add(new Label("Marks in JAVA"));

       t3=new TextField(3);    p4.add(t3);

       p4.add(new Label("Marks in VB .Net"));

       t4=new TextField(3); p4.add(t4);

       p4.add(new Label("Marks In C"));

       t5=new TextField(3); p4.add(t5);     

       p4.add(new Label("Total "));

       t6=new TextField(3); p4.add(t6);     

       p4.add(new Label(" Average"));

       t7=new TextField(3); p4.add(t7);     

        p4.add(tot);   p4.add(avg);

        tot.addActionListener(this);

        avg.addActionListener(this);

        c1.addItemListener(this);

        c2.addItemListener(this);

      

        c3.addItemListener(this);

        c4.addItemListener(this);

        m.addItemListener(this);

        f.addItemListener(this);

       

             add(p4);

      }

 

               public void paint(Graphics g)

      {

         int no,m1,m2,m3,tot;

         float avg=0.0f;

         no=m1=m2=m3=tot=0;

         try

         {

            m1=Integer.parseInt(t3.getText());

            m2=Integer.parseInt(t4.getText());

            m3=Integer.parseInt(t5.getText());

         }

         catch(Exception e)

         {

         }

         tot=m1+m2+m3;

         avg= tot/3;

         s1=String.valueOf(tot);

         s2=String.valueOf(avg);

     }

      public boolean action(Event e,Object o)

      {

        repaint();

        return true;

      }

      public void actionPerformed(ActionEvent e)

      {

         s3=e.getActionCommand();

         if(s3.equals("Total"))

           t6.setText(s1);

         if(s3.equals("Average"))

           t7.setText(s2);

           repaint();

      }

        public void itemStateChanged(ItemEvent e)

      {

         repaint();

       }

 }