ch20_6.java

java练习程序

import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
class EWindowCh20_6 extends Frame implements ItemListener, ActionListener
{
	String str[]=new String[7];
	String s;
	FileReader file;
	BufferedReader in;
	Button button_start;
	Checkbox box[] ;
	TextField text_word, text_fenshu;
	int fenshu=0;
	CheckboxGroup age=new CheckboxGroup();
    
	EWindowCh20_6()
	{
		super("英语单词学习");
		text_fenshu=new TextField(10);
		text_word=new TextPield(70);
		button_start=new  Button["重新练习");
		button_start.addActionListener(this);
		try
		{
			file=new FileReader("English.txt");
			mn=new BufferedReader(file);
		}
		catch(FileNotFoundException e)
		{}
		catch(IOException e)
		{}
		setBounds(100, 100, 400, 320);
		setVisible(true);
		setLayout(new GridLayout(5, 1));
		setBackground(Color.pink);
		Panel pl=new Panel().p2=new Panel(), p3=new Panel(),  p4=new Panel();
		p2.setLayout(new GridLayout(2, 1));
		p3.setLayout(new GridLayout(5, 1));
		pi.add(new Label("您的得分:"));
		pl.add(text fenshu);
		p2.add(new Label("句子填空:"));
		p2.add(text_word);
		p4.add(button start);
		box=new Checkbox[6];
		for(int i=0;i<=4;i++)
		{
			box[ii=new Checkbox("  ", false, age);
			box[i].addItemListener(this);
		}
		p3.add(new Label("选择答案:  "));
		for(int i=l;i<=4;i++)
		{
			p3.add(box[i]);
		}

		add(pl);
		add(p2);
		add(new Label());
		add(p3);
		add(p4);
		addWindowListener(new WindowAdapuer()
		{
			public void windowClosing(WindowEvent e)
			{
				setVisible(false);System.exit(0);
			}
		});
		reading();
	}
	
	public void reading()
	{
		int i=0;
		try
		{
			s=in.readLine();
			if(!(s.startsWith("endend")))
			{
				StringTokenizer tokenizer=new StringTokenizer(s,  "#");
				while(tokenizer.hasMoreTokens())
				{
					str[i]=tokenizer.nextToken();i++;
				}
				text_word.setText(str[0]);
				for(int j=l;j<=4;j++)
				{
					box [j].setLabel(str [j]);
				}
			}
			else if(s.startsWith("endend"))
			{
				text_word.setText("学习完毕");
				for(int j=l;j<=4;j++)
				{
					box[j].setLabel("end");
					in.close();
					file.close();
				}
			}
			catch(IOException exp)
			{}
		}
	}
	
	public void actionPerformed(ActionEvent event)
	{
		if(event.getSource()==button_start)
		{
			file=null;
			in=null;
			fenshu=0;
			text fenshu.setText("得分:   "+fenshu);
			try
			{
				file=new FileReader( "English.txt");
				in=new BufferedReader(file);
			}
			catch(FileNotFoundException e)
			{}
			catch(IOException e)
			{}
			reading();
		}
	}

	public void itemStateChanged(ItemEvent e)
	{
		for(int j=l;j<=4;j++)
		{
			if(box[j].getLabel().equals(str[5])&&box[j].getState())
			{
				fenshu++;text fenshu.setText("得分:   "+fenshu);
			}
		}
		reading();
	}
}

public class Ch20_6
{
	public static void main(String args[])
	{
		EWindowCh20_6 w=new EWindowCh20_6();w.pack();
	}
}