memo_calcu.java

package Calcu;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class QCMFlash {
	private ArrayList<Tuple<String, String>> map;
	private Random rng;
	private static final int[] nbQuestions = new int[]{8, 16, 24, 16, 7, 6, 7, 9, 7, 7, 14, 23};
	private static final int totalNbQuestions = 144;
	private int[] nbQuestionsSum;
	private Tuple<Integer, String> currentQ;
	
	class Tuple<X, Y> { 
		public final X x; 
		public final Y y; 
		Tuple(X x, Y y) { 
			this.x = x; 
			this.y = y; 
		}	
		public X getFirst() { return this.x; }
		public Y getLast() { return this.y; }
	} 
	
	QCMFlash() throws Exception {
		map = new ArrayList<>();
		rng = new Random();
		nbQuestionsSum = new int[nbQuestions.length];
		for (int i = 0; i < nbQuestions.length; i++) {
			if (i == 0)
				nbQuestionsSum[i] = nbQuestions[i];
			else
				nbQuestionsSum[i] = nbQuestionsSum[i-1] + nbQuestions[i];
		}
		if (nbQuestionsSum[nbQuestionsSum.length - 1] != totalNbQuestions) {
			throw new Exception("nbQuestions and totalNbQuestions Inconsistent.");
		}
        BufferedReader br = new BufferedReader(new InputStreamReader(
        		new FileInputStream(getClass().getResource("qcm.txt").getFile()), "UTF8"));
		try {
			String line = br.readLine();
			int lino = 1;
			int curChapter = 0;
			int nbQuestionsCurChapter = 0;
			while (line != null) {
				if (line.trim().equals("") || line.startsWith("//")) {
					if (line.startsWith("//")) {
						if (curChapter > 0 && (nbQuestionsCurChapter != nbQuestions[curChapter - 1])) {
							throw new Exception("Only read " + nbQuestionsCurChapter + "/" + nbQuestions[curChapter - 1] +
									" questions for chapter " + curChapter);
						}
						curChapter++;
						nbQuestionsCurChapter = 0;
					}
					line = br.readLine();
					continue;
				}
					
				String[] cols = line.split(";");
				if (cols.length != 2) {
					throw new Exception("qcm.txt has a broken entry at line " + lino);
				}
				map.add(new Tuple<String,String>(cols[1], cols[0]));
				line = br.readLine();
				nbQuestionsCurChapter++;
				lino++;
			}
			if ((lino - 1 != totalNbQuestions) && (totalNbQuestions != map.size())) {
				System.out.println(map.size() + " "+lino);
				throw new Exception("Amount of questions in qcm.txt and totalNbQuestions Inconsistent.");
			}
		} finally {
			br.close();
		}
	}

	String getRandomQ(int chapter) {
		int floor = 0;
		int ceil = 0;

		if (chapter == 0) {
			ceil = totalNbQuestions;
		} else {
			if (chapter > 1)
				floor = nbQuestionsSum[chapter - 2];
			ceil = nbQuestions[chapter - 1];
		}

		int index = floor + rng.nextInt(ceil);
		currentQ = new Tuple<Integer, String>(index, map.get(index).getFirst());
		return currentQ.getLast();
	}

	String getQuestionAnswer(int index) {
		return map.get(index).getLast();
	}

	public static void main(String[] args) {
		QCMFlash f;

		try {
			f = new QCMFlash();

			JFrame frame = new JFrame("Calcu Mémo");
			frame.setSize(400,400);
		    frame.setLayout(new GridLayout(5, 1));
		   

			JLabel question = new JLabel("Question", JLabel.CENTER);
			JLabel answer = new JLabel("Réponse", JLabel.CENTER);
			
			JComboBox<String> courseSelection = new JComboBox<String>(
					new String[]{"Tous les cours", "Séance 1", "Séance 2", "Séance 3", "Séance 4", "Séance 5", 
							"Séance 6", "Séance 7", "Séance 8", "Séance 9", "Séance 10", "Séance 11", "Séance 12"});
			courseSelection.setSelectedIndex(0);

			JButton randomQ = new JButton("Question");
			
			JButton answerB = new JButton("Réponse");
			answerB.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent event) {
					answer.setText(f.getQuestionAnswer(f.currentQ.getFirst()));
				}
			});
			
			randomQ.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent event) {
					question.setText("<html>"+f.getRandomQ(courseSelection.getSelectedIndex())+"</html>");
					answer.setText("Réponse");
				}
			});

			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.getContentPane().add(question);
			frame.getContentPane().add(answer);
			frame.getContentPane().add(courseSelection);
			frame.getContentPane().add(answerB);
			frame.getContentPane().add(randomQ);
			frame.setVisible(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}