electionframe.java

一个用JAVA 写的程序

                    				ballot.addCandidate(id);
 				          }
				          ballotPapers.add(ballot);
                }
             }
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace();
            System.exit(1);            
        }
    }// initBallotPapers end
    
    public void doElect()
    {
    	Candidate candidate = new Candidate() ;
	   int CandidateNumber;
		
		curRound ++;
		CandidateNumber = candidateList.getNumberOfCandidates();
		if (curRound == 1)
		{
			firstElect();
			for (int i = 0; i<CandidateNumber ; i++)
			{
				showStr += candidateList.getCandidate(i).getId() + "     " ;
			}
			showStr += '\n';
			for (int i = 0; i<CandidateNumber ; i++)
			{
				showStr += candidateList.getCandidate(i).getVotesNumber() + "      ";
			} 
			showStr += '\n'; 
			showStr += '\n';
		}
		else
		{
			otherElect();

			for (int i = 0; i<CandidateNumber ; i++)
			{
				if(candidateList.getCandidate(i).isEliminated())
				{
					showStr += "-" + "     ";
				}
				else
				{
					
					showStr += candidateList.getCandidate(i).getVotesNumber() + 
								  candidateList.getCandidate(i).getOtherVotesNumber()+"      ";
				}
			} 
			showStr += '\n';
			showStr += '\n'; 
		}
		
		if (isEnd())
		{	
			electionRoundButton.setEnabled(false);
			candidate = candidateList.getWinner();
			if (candidate !=null)
			{
				showStr += candidate.getId() + ":";
				showStr += candidate.getName();
				showStr += " is elected" + '\n';
			}
			else
			{
				showStr += " No one is elected" + '\n';

			}
			showVote(showStr);
		}
		else
		{
			candidate = eliminateCandidate();
			showStr += candidate.getId() + ",";
			showStr += candidate.getName();
			showStr += " is eliminated" + '\n';
			showVote(showStr);
		}		   
		updateDisplays();
    }//doElect() end
    
    public void firstElect()
    {
		Candidate candidate = new Candidate();

		int i;

		for(i = 0 ; i< ballotPapers.getNumberOfBallot() ; i++)
		{
			candidate = ballotPapers.getBallot(i).getCandidate(curRound);
			candidateList.find(candidate.getId()).addVotesNumber();
		}
    }
    
    public void otherElect()
    {
 		boolean isAdd = true;
		String id;
		int i;
		int j ;
		
		for(i = 0 ; i< ballotPapers.getNumberOfBallot() ; i++ )
		{
			Candidate candidate = new Candidate();
			// Judge if all the candidate who list before be elimitated
			// if is ture add for this candidate
			// else next ballot 
			for (j = 1 ; j< curRound ; j++ )
			{
				id = ballotPapers.getBallot(i).getCandidate(j).getId();
				candidate = candidateList.find(id);
				isAdd  = true ;
				if (candidate.isEliminated() == false) 
				{
					isAdd = false;
					break;
				}
			}
			if(isAdd)
			{	
					id = ballotPapers.getBallot(i).getCandidate(curRound).getId();
					candidateList.find(id).addOtherVotesNumber();
			}
		}
    }
    
    public Candidate eliminateCandidate()
    {
    		int min;
		   int voteNumber;
		   int index;
		   int numOfCandidate;
		   int i;
		   
		   Candidate candidate = new Candidate();
		   
		   numOfCandidate = candidateList.getNumberOfCandidates();
		   candidate = candidateList.getCandidate(0);
		   min = candidate.getVotesNumber() + candidate.getOtherVotesNumber();
		   index = 0;
		   
			for (i = 1 ; i < numOfCandidate ; i++ )
			{
				candidate = candidateList.getCandidate(i);
				if (candidate.isEliminated() == false)
				{
					voteNumber = candidate.getVotesNumber() + candidate.getOtherVotesNumber();
					if (voteNumber < min) 
					{
						min = voteNumber;
						index = i;
					}
				}
			}
			candidateList.getCandidate(index).setEliminated(); 
			candidateList.getCandidate(index).setEliminatedRound(curRound);
			return candidateList.getCandidate(index) ;
    }
    
    // Judge if the election is end 
    public boolean isEnd()
    {
    		Candidate candidate = new Candidate();
		   int i;
		   int index = 0;
		   boolean endBefore = false;
		   double ratio;
		   int unEliminatedNumber = 0;
		   	
		   for (i = 0 ; i < candidateList.getNumberOfCandidates() ; i++ )
			{
		   	candidate = candidateList.getCandidate(i);
			   ratio = (double)(candidate.getVotesNumber()+candidate.getOtherVotesNumber()) / ballotPapers.getNumberOfBallot();
			   if (ratio>0.5)
			   {
			   	index = i;
				   endBefore = true;
				   break;
				}
			   if(candidate.isEliminated()) continue;
			   index = i;
			   unEliminatedNumber ++;
			   if (unEliminatedNumber > 1) return false;
			}

			candidateList.getCandidate(index).setElected();
			candidateList.setWinner(candidate);
			if (endBefore)
			{
				for (i = 0 ; i < candidateList.getNumberOfCandidates() ; i++ )
				{
					candidate = candidateList.getCandidate(i);
					if (candidate.isEliminated() == false && candidate.isElected() == false) 
					{
							candidateList.getCandidate(i).setEliminated();
							candidateList.getCandidate(i).setEliminatedRound(curRound);
					}
				}
			}
			return true;   
    }
    
    // display bar chart in seperate frame
    public void doBarChart()
    {       
        aChartFrame = new ChartFrame(candidateList);
        aChartFrame.setLocation(0, 400);
        aChartFrame.show();
    }
    
    // exit program
    public void doClose()
    {
            System.exit(0);
    }
        
    // Find details for a candidate
	 public boolean doFind(String candidateId)
    {              
		  int round ;
        Candidate aCandidate = candidateList.find(candidateId);    // find Candidate
        if (aCandidate  == null)    // if the Candidate not exists
        {
            JOptionPane.showMessageDialog(null, "Candidate does not exist");
            return false;
        }
        else
        {
        		candidateName 		= aCandidate.getName();
		      firstVotesNumber 	= aCandidate.getVotesNumber(); 
		      otherVotesNumber 	= aCandidate.getOtherVotesNumber();
		      round 				= aCandidate.getEliminatedRound();
		      elected				= aCandidate.isElected();
		      
		      return true;                                     
        }                                                                         
    }//doFind() end
    
    // show the vote of every round to screen display 
    public void showVote(String voteStr)
    {
      
       displayArea.setText(voteStr);    // add the string to text area
       outputFile(voteStr);
    }
    
	 public void outputFile(String voteStr)
	 {
	     try
        {  
            FileWriter 				fw 			= new FileWriter ("ElectionOut.txt",false);
        		BufferedWriter 		bw 			= new BufferedWriter (fw);
		       
		      bw.write(voteStr);
		      bw.close();		  
		  }
		  catch (IOException ioe)
        {
            ioe.printStackTrace();
            System.exit(1);            
        }
	 }
    // update  bar chart if they are showing 
    public void updateDisplays()
    {
       if (aChartFrame != null && aChartFrame.isShowing())
       {
          aChartFrame.dispose();
          doBarChart();
       }          
    }
               
       
}