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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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public class NTBApplet extends JApplet
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implements ActionListener
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{
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    private Interface myInterface = new Interface();
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    private String myQuestion = "";
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    private String myAnswer = "";
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    private int myAnswerPlace = 0;
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    private int myQuestionPlace = 0;
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    private JButton button1, button2, button3;
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    private Font textFont = new Font("Verdana",Font.BOLD,12);
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public void init()
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{
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    button1 = new JButton("Next Question");
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    button1.setToolTipText("Next Question");
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    button1.addActionListener(this);
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    button2 = new JButton("Show Answer");
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    button2.setToolTipText("Show Answer");
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    button2.addActionListener(this);
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    button2.setEnabled(false);
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    button3 = new JButton("Input Questions");
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    button3.setToolTipText("Input Questions");
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    button3.addActionListener(this);
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    JPanel panel = new JPanel();
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    panel.add(button1);
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    panel.add(button2);
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    JPanel panel2 = new JPanel();
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    panel.add(button3);
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    Container c = getContentPane();
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    c.setBackground(Color.white);
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    c.add(panel, BorderLayout.SOUTH);
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    c.add(panel2, BorderLayout.EAST);
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}
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/**
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* Processes button events
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*/
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public void actionPerformed(ActionEvent e)
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{
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    JButton button = (JButton)e.getSource();
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    if (myInterface.getStack().size() == 0) //if there are no more questions/answers make a new interface.
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    {
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        myInterface = new Interface();
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        myAnswerPlace = 0;
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        myQuestionPlace = 0;
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        JOptionPane.showMessageDialog(this, "All questions have been used and will now be reused.", "New Questions", JOptionPane.INFORMATION_MESSAGE);
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        myQuestion = "";
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        myAnswer = "";
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    }
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    else if (myInterface.getStack().size() > 0)
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    {
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        if (button == button1)
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        {
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            myQuestion = myInterface.getQuestion();
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            myAnswer = "";
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            button1.setEnabled(false);
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            myQuestionPlace++;
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        }
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        else if (button == button2)
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        {
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            myAnswer = myInterface.getAnswer();
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            button1.setEnabled(true);
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            myAnswerPlace++;
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        }
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        else if (button == button3)
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        {
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            String inputQuestion = JOptionPane.showInputDialog("Enter Question:");
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            String inputAnswer = JOptionPane.showInputDialog("Enter Answer:");
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            myInterface.enterQuestion(inputQuestion);
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            myInterface.enterAnswer(inputAnswer);
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            myInterface = new Interface();
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            JOptionPane.showMessageDialog(this, "A new round will start.", "New Questions", JOptionPane.INFORMATION_MESSAGE);
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        }
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    if ( myQuestionPlace > myAnswerPlace)
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    button2.setEnabled(true);
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    else
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    button2.setEnabled(false);
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    }
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    repaint();
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}
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public void paint(Graphics g)
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{
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    super.paint(g);
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    //g.setFont(textFont);
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    g.drawString("Question:", 10, 25);
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    g.drawLine(10, 30, 680, 30);
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    g.drawString(myQuestion, 10, 45);
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    g.drawString("Answer:", 10, 65);
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    g.drawLine(10, 70, 680, 70);
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    g.drawString(myAnswer, 10, 85);
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}
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