ウィンドウ処理について

public class Test7 extends Frame {

	private static final Question[] QUESTIONS;

	private int number = 0;

	Label mylabel, mylabel2;

	Checkbox cb1, cb2, cb3;

	CheckboxGroup cbg;

	Question question;



	public Test7() {

		setTitle("問題");

		setSize(300, 150);

		setLayout(null);



		cbg = new CheckboxGroup();

		ClickItem ci = new ClickItem();



		mylabel = new Label("問題");

		mylabel.setBounds(50, 25, 200, 25);

		this.add(mylabel);

		

		mylabel2 = new Label("");

		mylabel2.setBounds(8, 25, 50, 25);

		this.add(mylabel2);





		cb1 = new Checkbox("1",true,cbg); 

		cb1.setBounds(20,50,150,20); 

		this.add(cb1); 

		cb1.addItemListener(ci); 



		cb2 = new Checkbox("2",true,cbg); 

		cb2.setBounds(20,70,150,20); 

		this.add(cb2); 

		cb2.addItemListener(ci); 



		cb3 = new Checkbox("3",true,cbg); 

		cb3.setBounds(20,90,150,20); 

		this.add(cb3); 

		cb3.addItemListener(ci); 

		

		initialize(QUESTIONS[number]);



		

		addWindowListener(new WindowAdapter(){

			public void windowClosing(WindowEvent e){System.exit(0);}

		});

	}

	

	public void initialize(final Question question) {

		this.question = question;

		

		this.mylabel.setText(question.getText());

		this.cb1.setLabel(question.getChoiceTitle(0));

		this.cb2.setLabel(question.getChoiceTitle(1));

		this.cb3.setLabel(question.getChoiceTitle(2));

		

		doLayout();

	}

	

	public static void main(String args[]) {

		new Test7().show();

	}



	class ClickItem implements ItemListener {

		public void itemStateChanged(ItemEvent ev) {

			String str1, str2;

			final int index;

			if (cb1.getState()) {

				index = 0;

				str1 = "不正解";

				//System.exit(0); 

			}

			else if (cb2.getState()) {

				index = 1;

			}

			else if (cb3.getState()) {

				index = 2;

			}

			else {

				throw new IllegalArgumentException();

			}

			

			final String text;

			if (question.isCorrect(index)) {

				text = "正解";

			}

			else {

				text = "不正解";

			}

			

			mylabel2.setText(text);

			

			if (QUESTIONS.length > (number + 1)) {

				number++;

			}

			else {

				number = 0;

			}

			

			initialize(QUESTIONS[number]);

		}

	}

	

	static {

		final ArrayList question = new ArrayList();

		

		question.add(new Question("今勉強しているのは何言語？？",new Choice[]{new Choice("C言語",false),new Choice("Java言語",true),new Choice("Perl言語",false)}));

		question.add(new Question("今の時間は？？",new Choice[]{new Choice("１時",true),new Choice("２時",false),new Choice("３時",false)}));

		

		QUESTIONS = (Question[])question.toArray(new Question[0]);

	}

}

class Question {

	private final String text;

	private final Choice[] choices;

	

	public Question(final String text,final Choice[] choices) {

		this.text = text;

		this.choices = choices;

	}

	

	public String getText() {

		return this.text;

	}

	

	public String getChoiceTitle(final int index) {

		return this.choices[index].getTitle();

	}

	

	public boolean isCorrect(final int index) {

		return this.choices[index].isCorrect();

	}

}

class Choice {

	private final String title;

	private final boolean correct;

	

	public Choice(final String title,final boolean correct) {

		this.title = title;

		this.correct = correct;

	}

	

	public String getTitle() {

		return this.title;

	}

	

	public boolean isCorrect() {

		return this.correct;

	}

}

public class Page {
    private final JFrame m_frame = new JFrame();
    private final JPanel m_firstPage = new JPanel();
    private final JPanel m_secondPage = new JPanel();
        
    public Page() {
        m_frame.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){System.exit(0);}
        });
                
        final JButton firstTrigger = new JButton("ページ２へ");
        firstTrigger.addActionListener(new NextPageAction(m_firstPage,m_secondPage));
        m_firstPage.add(firstTrigger);
        m_firstPage.add(new JTextField("first"));
    
        final JButton secondTrigger = new JButton("ページ１へ");
        secondTrigger.addActionListener(new NextPageAction(m_secondPage,m_firstPage));
        m_secondPage.add(secondTrigger);
        m_secondPage.add(new JCheckBox("second"));
    
        
        m_frame.getContentPane().add(new JLabel("ページ切り替え"),BorderLayout.NORTH);
        m_frame.getContentPane().add(m_firstPage);

        m_frame.pack();
        m_frame.show();
    }
    
    private class NextPageAction implements ActionListener {
        private final JPanel m_thisPage;
        private final JPanel m_nextPage;
        
        public NextPageAction(final JPanel thisPage,final JPanel nextPage) {
            m_thisPage = thisPage;
            m_nextPage = nextPage;
        }
        
        public void actionPerformed(ActionEvent e) {
            m_frame.getContentPane().remove(m_thisPage);
            
            m_frame.getContentPane().add(m_nextPage);
            
            m_frame.pack();
        }
    }
    
    public static void main(final String[] args) {
        final Page page = new Page();
        
    }
}