exam.java

exam system for all developers

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
import java.io.*;
import java.util.zip.*;
import java.net.*;


public class Exam extends Applet {
  String  sQuestionSource;
  MarkForm frMark;
  boolean isStandalone = false;
  public TextArea ta = new TextArea(15,55);
  Panel pOptButtons = new Panel();
  Panel pCmdButtons = new Panel();
  Panel pSouth = new Panel();


  Button cmdForward = new Button("Forward");
  Button cmdBack = new Button("Back");
  Button cmdMark = new Button("Mark");
  TimerLabel tl = new TimerLabel();
  FlowLayout flowLayout1 = new FlowLayout();

  BorderLayout borderLayout1 = new BorderLayout();
  GridLayout layGridSouth = new GridLayout(2,1);
  GridLayout gridLayout1 = new GridLayout(6,30);
  Vector v = new Vector();
  boolean bMarkDisplayed=false;
  public   QuestManager qm ;

   //Construct the applet

  public Exam() {
  }
//Initialize the applet

  public void init() {
    try {
    jbInit();
    }
    catch (Exception e) {
    e.printStackTrace() ;
    }
  }
//Component initialization

  private void jbInit() throws Exception {

     this.setLayout(borderLayout1);

     String sWelcome = "\nThis applet simulates taking the Sun Certified Java Programmers Exam. \n";
     sWelcome += "When you click Forward for the first time the first question will be displayed";
     sWelcome += " and the counter will start.";
     ta.setText(sWelcome);


     add("North",ta);
     pCmdButtons.add(cmdForward);
     pCmdButtons.add(cmdBack);
     pCmdButtons.add(cmdMark);
     pCmdButtons.add(tl);

     pCmdButtons.setLayout(flowLayout1);
     pCmdButtons.setBackground(Color.pink);
     add("South",pCmdButtons);
     pOptButtons.setBackground(Color.green);
     pOptButtons.setLayout(gridLayout1);
     add("Center",pOptButtons);
     go();

  }




public void go(){
FileOpener fo = new FileOpener();

sQuestionSource= getParameter("QuestionSource");
v =fo.openFile(sQuestionSource);

//v =fo.openFile("http://www.software.u-net.com/applets/Exam/JXam.txt");
    //For an applet this should be put in a parameter
   // v= fo.openFile("file:///JBuilder2/myprojects/Xam/JXam.txt");
   // v= fo.openFile("file:///jdk1.1/myprogs/Exam/JXam.txt");
 qm = new QuestManager(v,this);
  //q.getForward();
  }
 public boolean handleEvent(Event event){
         //String sArg="";

    if((event.id) == Event.WINDOW_DESTROY) {
    String s=  this.getName();
    }


  if((event.id) ==Event.ACTION_EVENT){
    if(event.target instanceof Checkbox){
       //System.out.println("Target is" + event.target);
       } else
       {
    String  sArg = (String) event.arg;
          if(sArg.equals("Forward")){
             qm.getForward();
             tl.StartCount();
           }
           if(sArg.equals("Back")){
             qm.getBack();
           }
           if(sArg.equals("Mark")){
           //if(bMarkDisplayed==false){
            if(frMark==null){
                frMark = new MarkForm(this);
                tl.StopCount();
                 }
                 else{
                 frMark=null;
                 frMark = new MarkForm(this);
                 tl.StopCount();
                 }
            // bMarkDisplayed=true;
            // }


           }
        }
    }
    return true;
}

}

class MarkForm extends Frame{
int iHeight=700;
int iWidth=1000;
Exam m_Xam;
Panel pAnswer= new Panel();
//GridLayout gl = new GridLayout();
MarkForm(){
go();
}

MarkForm(Exam arg){
m_Xam=arg;
go();
}

public String bArrayToString(boolean[] bAns){
      String sAns="";
      for(int j=0;j< bAns.length; j++){
          if(bAns[j]==true){
              //increment to account for 0th start
              sAns=sAns+" "+(j+1);
              }
      }
      return sAns;
}

public void go(){
  getMarks();
  setVisible(true);
  setBackground(Color.green);
  this.setTitle("Marks");
  }

public void getMarks(){

  Panel pnlMarks = new Panel();
  this.setLayout(new BorderLayout());
  Panel pnlNorth= new Panel();
  pnlNorth.setLayout(new GridLayout(3,1));
  GridLayout gl = new GridLayout();

  m_Xam.qm.getForward();
  m_Xam.qm.getBack();

  int iRightAnsCount= m_Xam.qm.getRightAnsCount();
  int iAttemptedAnsCount = m_Xam.qm.getAttemptedCount();
  float iAnsRows = iAttemptedAnsCount - iRightAnsCount;
  float fPercentMark =0;
  //Let's not try to divide by zero      
  if(iAttemptedAnsCount >0){
  fPercentMark= ((float)iRightAnsCount) /((float) iAttemptedAnsCount) ;
  }
  int iPercentMark =  (int) (fPercentMark *100);

  //iAnsRows=40;

  if(iAnsRows > 25){
      //pnlMarks.setLayout(new GridLayout(25,2));
      gl.setRows((int) iAnsRows/2);
      gl.setColumns(2);
      pnlMarks.setLayout(gl);
      setSize(iWidth, iHeight);
  }else{

  this.setSize(iWidth/2,iHeight);
  pnlMarks.setLayout(new GridLayout(25,1));
  }

  //setSize(iWidth, iHeight);

  Label lblAttemptedAnsCount = new Label("You attempted  " + iAttemptedAnsCount + " Questions");
  String sRightAns;

 if(iRightAnsCount ==0){
    sRightAns = " " + iRightAnsCount + " answers were correct, a mark of "+  iPercentMark  +" %";
    } else if(iRightAnsCount==1){
    sRightAns = " " + iRightAnsCount + " answer was correct, a mark of "+  iPercentMark  +" %";
    }else{
    sRightAns = " " + iRightAnsCount + " answers were  correct, a mark of "+  iPercentMark  +" %";
    }

  Label lblRightAnsCount = new Label(sRightAns);
  pnlNorth.add(lblAttemptedAnsCount);
  pnlNorth.add(lblRightAnsCount);

  System.out.println("iPercentMark "+iPercentMark);
  if(iPercentMark < 100)
    pnlNorth.add(new Label(" Following are my answers that didn't match yours, See HTML version for explanations"));

  pnlNorth.setBackground(Color.pink);
  add(pnlNorth,"North");
  pnlMarks.setBackground(Color.green);
  this.remove(pnlMarks);

  String s = "";
  int iQuestCount = m_Xam.qm.getQuestCount();
  for (int i=0;i < iQuestCount; i++)  {
    boolean bAnsRight= m_Xam.qm.getAnsweredRight(i);
    boolean bAttempted=m_Xam.qm.getAtttempted(i);

    //If an answer was given but was incorrect
    if((bAnsRight ==false) && (bAttempted==true)) {
    // if(true){
      boolean bAns[]= m_Xam.qm.getRightAns(i);
      s= (i+1)+") Option(s)"+bArrayToString(bAns);
      TextField t = new TextField(s);
      //t.setText(s);
      pnlMarks.add(t);
      }//End if
  }//End for
  add(pnlMarks);
}

 public boolean handleEvent(Event event){
    if((event.id) == Event.WINDOW_DESTROY) {
       this.dispose();
      }
    return true;
  }
}