exampc.java

考试系统

import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.io.FilenameFilter;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class ExamPC extends Frame implements ItemListener, ActionListener, Runnable {

	Choice list;

	JTextArea shiTi;// 试题
	JTextArea mesg;//答题结果信息区
	JTextField showTime;
	JButton next,scrose,combit;
	JLabel welcomeLabel=null;
	
	ReadTestquestion rt;
	
	CheckboxGroup selectItem;
	Checkbox box[];
	
	//
	Thread countTime=null;//计时器
	long time=0;
	boolean closeCountTime=false;//关闭计时器
	 

	ExamPC() {
		super("exam");
		list = new Choice();
		// 找出当前目录下的所有.txt文件
		String workdir = System.getProperty("user.dir");
		File dir = new File(workdir);
		FileName fileText = new FileName("txt");
		String filename[] = dir.list(fileText);
		// 把.txt的文件名加入选题列表框
		for (int i = 0; i < filename.length; i++) {
			list.add(filename[i]);
		}
		list.addItemListener(this);

		// 试题区
		shiTi = new JTextArea(15, 12);
		shiTi.setLineWrap(true);
		shiTi.setWrapStyleWord(true);
		shiTi.setFont(new Font("Times Roman", Font.PLAIN, 14));
		shiTi.setForeground(Color.blue);

		//消息区
		mesg=new JTextArea(10, 10);
		mesg.setLineWrap( true);
		mesg.setWrapStyleWord( true);
		
		// 答题区
		selectItem = new CheckboxGroup();
		box = new Checkbox[4];
		String s[] = { "A", "B", "C", "D" };
		for (int i = 0; i < 4; i++) {
		box[i] = new Checkbox(s[i], selectItem, false);
		}

		combit=new JButton("提交答案");
		combit.addActionListener(this);
		next = new JButton("读取第一题");
		next.addActionListener(this);
		scrose=new JButton("查分数");
		scrose.addActionListener( this);
		
		rt = new ReadTestquestion();
		
		showTime=new JTextField(20) ;
		showTime.setHorizontalAlignment( SwingConstants.RIGHT);
		showTime.setEditable( false);
		
		//
		countTime=new Thread(this);
	
		
		// 布局
		Box boxH1 = Box.createVerticalBox();
		Box boxH2 = Box.createVerticalBox();
		Box baseBox = Box.createHorizontalBox();
		boxH1.add(new Label("选择试题文件"));
		boxH1.add(list);
		boxH1.add(new JScrollPane(mesg));
		JPanel p4 = new JPanel();
        
        boxH1.add(scrose);
        p4.add(new Label("剩余时间"));
        p4.add(showTime);
   
        boxH1.add(p4);
        
		boxH2.add(new Label("试题内容:"));
		boxH2.add(new JScrollPane(shiTi));
		JPanel p2 = new JPanel();
		JPanel p3 = new JPanel();
		for (int i = 0; i < 4; i++) {
			p3.add(box[i]);
		}
		p2.add(p3);
		p2.add(combit);
		p2.add(next);
		boxH2.add(p2);
		baseBox.add(boxH1);
		baseBox.add(boxH2);
		setLayout(new BorderLayout());
		add(baseBox, BorderLayout.CENTER);
		
		welcomeLabel=new JLabel("欢迎使用本考试系统！");
		welcomeLabel.setFont( new Font("隶书",Font.PLAIN ,30));
		welcomeLabel.setHorizontalAlignment( SwingConstants.CENTER );
		welcomeLabel.setForeground (Color.blue  );
		add(welcomeLabel,BorderLayout.NORTH    );
		
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent w) {
				System.exit(0);
			}
		});
		setVisible(true);
		setBounds(60, 50, 660, 460);
		setResizable(false);
		validate();
	}

	public static void main(String[] args) {
		ExamPC ep = new ExamPC();
	}

	public void itemStateChanged(ItemEvent e) {
		showTime.setText( null);
		closeCountTime=false;
	
		String name = (String) list.getSelectedItem();
			String str="";
			rt.setFileName(name);
			
			//
			rt.setcomplete( false);
			time=rt.getTime() ;
						
			if(countTime.isAlive())
			{
				
				closeCountTime=true;
				countTime.interrupt() ;
			}
			countTime=new Thread(this);
			
			mesg.setText( null);
			shiTi.setText(null);
			next.setText ("读取第一题" );
			combit.setEnabled( false);
			next.setEnabled( true);
			
			str=rt.getFilename();
			welcomeLabel.setText( "欢迎考试，你选择的是：试题"+str.substring( 0,str.length() -4));
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == next) {
			
			next.setText( "下一题");
			combit.setEnabled( true);
			shiTi.setText(rt.getTestContent());
			
			mesg.setText( null);
			next.setEnabled( false);
			//
			try {
				countTime.start() ;
			} catch (Exception e1) {
				
			}			
		}
		if(e.getSource() ==combit)
			{
				next.setEnabled( true);
				combit.setEnabled( false);
				String answer="?";
				for(int i=0;i<4;i++)
				{
					if(box[i].getState() ==true) 
					  {answer=box[i].getLabel() ;
					   box[i].setState(false);
					  	   break;
					  }
				}
				rt.setSelection( answer);
			}
		if (e.getSource() ==scrose)
			{
					int score=rt.getScore() ;
					String message=rt.getMessage() ;
					mesg.setText( message+"\n"+"你答对了:"+score+"个题");
			}
	}

  public  void run() 
  {
	while(true)
	{
	  if(time<=0)
		{
			closeCountTime=true;
			countTime.interrupt() ;
			combit.setEnabled( false);
			next.setEnabled( false);
				showTime.setText( "考试时间用尽，考试结束！");
			}
			else
				if(rt.getcomplete() )
				{
					closeCountTime=true;
					countTime.interrupt() ;
					combit.setEnabled( false);
					next.setEnabled( false);
				}
				else
					if(time>=1)
					{
						time=time-1000;
						long leftTime=time/1000;
						long leftHour=leftTime/3600;
						long leftMinute=(leftTime-leftHour*3600)/60;
						long leftSecond=leftTime%60;
						showTime.setText( ""+leftHour+" 小时"+leftMinute+"分"+leftSecond+"秒");
					}
					try {
							Thread.sleep( 1000);
						} catch (InterruptedException e)
						{
							if(closeCountTime==true)
							   return;
						}
	 }
	}
}

class FileName implements FilenameFilter {
	String str = null;

	FileName(String s) {
		str = "." + s;
	}

	public boolean accept(File dir, String name) {
		return name.endsWith(str);
	}
}