20130409 【结对】 四则运算
编写环境： Eclipse
作业代码：
import java.util.*; import java.io.*; import javax.swing.*; import java.awt.*; import javax.swing.event.*; import java.awt.event.*; class Expression//表达式类，存放表达式 { int a;//第一个数 int b;//第二个数 int c;//正确答案 int d;//输入答案 char operator;//运算符 boolean is_right; public Expression() { a=b=c=0; d = -1; is_right = false; operator = '+'; } } class NumberTooBigException extends Exception { String message; public NumberTooBigException(String ErrorMessage) { message = ErrorMessage; } public String getMessage() { return message; } } public class fdgfg { Vector<Expression> v; public fdgfg() { v = new Vector<Expression>(); } public void produceExpression(int bit,char operator) { Expression temp = new Expression(); temp.operator = operator; temp.a = (int)(Math.random() * Math.pow(10,bit)); temp.b = (int)(Math.random() * Math.pow(10,bit)); switch (operator) { case '+': temp.c = temp.a + temp.b;break; case '-': temp.c = temp.a - temp.b;break; case '*': temp.c = temp.a * temp.b;break; case '/': temp.b = (temp.b == 0 ? //排除除法被除数为0的情况 temp.b = 1 +(int)(Math.random() * Math.pow(10,bit)-1): temp.b); temp.c = temp.a / temp.b;break; default : mixExpression(temp,bit);//混合运算 } v.add(temp); } //混合运算，产生随机数 public void mixExpression(Expression temp,int bit) { int rand = (int)(Math.random()*4); switch(rand) { case 1: temp.c = temp.a + temp.b;temp.operator = '+';break; case 2: temp.c = temp.a - temp.b;temp.operator = '-';break; case 3: temp.c = temp.a * temp.b;temp.operator = '*';break; case 0: temp.b = (temp.b == 0 ? //排除除法被除数为0的情况 temp.b = 1 +(int)(Math.random() * Math.pow(10,bit)-1): temp.b); temp.c = temp.a / temp.b;temp.operator = '/';break; default : } } public void writeInfo(int num,String userName) { File myFile = new File(userName + ".his"); FileOutputStream fos; File saveUserNameAndScore = new File("UserNameAndScore.data"); try { fos = new FileOutputStream(myFile,true); PrintStream ps = new PrintStream(fos); double score = 0; ps.println(String.format("%5s%5s%5s%5s%5s%10s%5s","","","","","正确答案","你的答案","判断")); ps.println(); for(int i = 0 ;i < num ;i++) { ps.println(String.format("%5d%5s%5d%5s%10d%10d%10s",v.get(i).a,"+", v.get(i).b,"=",v.get(i).c,v.get(i).d,(v.get(i).is_right ? "正确":"错误"))); ps.println(); if(v.get(i).is_right) { score += 100.0/num; } } ps.println("你的总分：" + score); ps.close(); fos.close(); //下面保存用户名和得分到UserNameAndScore.data文件; fos = new FileOutputStream(saveUserNameAndScore,true); ps = new PrintStream(fos); ps.println(userName); ps.println(score); ps.close(); fos.close(); } catch (Exception ex) { System.out.println (ex.getMessage()); } } public static void main(String[] s) { OverAllFrame oaf = new OverAllFrame("小学生四则运算软件V1.0罗凯旋＆马志磊 "); } } //主体框架 class OverAllFrame extends JFrame { TimeThread timer; //计时器线程 fdgfg ar ;//内部算法 JPanel headPanel;//头面板 JLabel welcomeLabel;//欢迎信息 JLabel timeUse; //用时信息 StartPanel st; String userName; RunningPanel rp; EndPanel ep; Vector<Expression> v;//存放算式 public OverAllFrame(String s) { super(s); userName = JOptionPane.showInputDialog("请输入用户名",""); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.initialize(); setHeadPanel(); this.setLocation(400, 100); this.setLayout(new BorderLayout()); this.add(headPanel,BorderLayout.NORTH); this.add(st,BorderLayout.CENTER); this.setSize(500,400); this.setVisible(true); } public void initialize()//初始化控件 { ar = new fdgfg(); headPanel= new JPanel(); welcomeLabel = new JLabel("欢迎! 用户：" + userName); st = new StartPanel(); rp = new RunningPanel(); ep = new EndPanel(); timeUse = new JLabel(); } public void setHeadPanel() { headPanel.setLayout(new FlowLayout()); headPanel.add(welcomeLabel); headPanel.add(timeUse); } //开始面板 class TimeThread extends Thread //计时器线程 { int min; int sec; int millis; long oldTime; long timeUsed; long timeSeted; JLabel display; boolean stop = false; public TimeThread(long timeSeted,JLabel display) { oldTime = System.currentTimeMillis(); this.display = display; this.timeSeted = timeSeted; // TODO Auto-generated constructor stub } @Override public void run() { // TODO Auto-generated method stub super.run(); do { timeUsed = System.currentTimeMillis() - oldTime; min = (int)(timeUsed/60000L); sec = (int)((timeUsed%60000L)/1000L); millis = (int)((timeUsed%60000L)%1000L); try { sleep(11); } catch (InterruptedException e) { // TODO: handle exception } display.setText("已用时:" + min+ ":" + sec +":" + millis ); display.setVisible(true); }while(timeUsed <= timeSeted && !stop); if(!stop)//如果不是手动停止的就运行complete rp.complete(); } public void setStop() { stop = true; } } class StartPanel extends JPanel { JPanel inputOptionPanel; //输入选项面板① JPanel selectOperatorOptionPanel;//选择运算符面板② JPanel bottomPanel; //底部面板③ JLabel inputBitLabel; //输入位数提示①-1 JTextField inputBitField; //输入位数区域①-2 JLabel inputNumLabel; //输入题目个数提示①-3 JTextField inputNumField; //输入题目个数区域①-4 JLabel inputTimeLabel; //输入做题时间提示①-5 JPanel inputTimePanel; //输入做题时间区域①-6 ButtonGroup operatorGroup; JRadioButton addButton ; //加法按钮②-1 JRadioButton minusButton ; //减法按钮②-2 JRadioButton multiplyButton ; //乘法按钮②-3 JRadioButton divideButton ; //除法按钮②-4 JRadioButton mixButton ; //混合运算按钮②-5 JLabel errorInfo; //错误信息③-1 JButton startButton; //开始按钮③-2 JTextField inputByminutes; //输入分钟区域①-6-1 JLabel printMinute; //打印提示“分”①-6-2 JTextField inputByseconds; //输入秒钟区域①-6-3 JLabel printSecond; //打印提示“秒”①-6-4 public StartPanel() { //this.setLayout(new GridLayout(0,1)); this.setLayout(new BoxLayout(this,BoxLayout.Y_AXIS)); this.initialize(); this.setInputOptionPanel(); this.setSelectOperatorOptionPanel(); this.setBottomPanel(); this.addStartEvent(); this.add(inputOptionPanel); this.add(selectOperatorOptionPanel); this.add(bottomPanel); } public void initialize() //初始化所有控件 { inputOptionPanel = new JPanel(); selectOperatorOptionPanel = new JPanel(); bottomPanel = new JPanel(); inputBitLabel = new JLabel("输入题目位数:"); inputBitField = new JTextField("1");//默认一位 inputNumLabel = new JLabel("输入题目个数:"); inputNumField = new JTextField("10");//默认产生10题 operatorGroup = new ButtonGroup(); addButton = new JRadioButton("加法"); minusButton = new JRadioButton("减法"); multiplyButton = new JRadioButton("乘法"); divideButton = new JRadioButton("除法"); mixButton = new JRadioButton("混合"); errorInfo = new JLabel(); startButton = new JButton("开始做题！"); inputTimeLabel = new JLabel("输入做题时间:"); inputTimePanel = new JPanel(); inputByminutes = new JTextField(); printMinute = new JLabel("分"); inputByseconds = new JTextField(); printSecond = new JLabel("秒"); } //设置做题时间面板 public void setInputTimePanel() { inputTimePanel.setLayout(new GridLayout(1,0)); printMinute.setHorizontalAlignment(SwingConstants.CENTER); printSecond.setHorizontalAlignment(SwingConstants.CENTER); inputTimePanel.add(inputByminutes); inputTimePanel.add(printMinute); inputTimePanel.add(inputByseconds); inputTimePanel.add(printSecond); } //设置输入选项面板 public void setInputOptionPanel() { inputOptionPanel.setLayout(new GridLayout(3,2)); inputBitLabel.setHorizontalAlignment(SwingConstants.CENTER); inputNumLabel.setHorizontalAlignment(SwingConstants.CENTER); inputTimeLabel.setHorizontalAlignment(SwingConstants.CENTER); inputOptionPanel.add(inputBitLabel); inputOptionPanel.add(inputBitField); inputOptionPanel.add(inputNumLabel); inputOptionPanel.add(inputNumField); inputOptionPanel.add(inputTimeLabel); setInputTimePanel(); inputOptionPanel.add(inputTimePanel); } //设置选择运算符面板 public void setSelectOperatorOptionPanel() { //selectOperatorOptionPanel.setLayout(new GridLayout(1,0)); selectOperatorOptionPanel.setLayout(new BoxLayout(selectOperatorOptionPanel,BoxLayout.X_AXIS)); operatorGroup.add(addButton); operatorGroup.add(minusButton); operatorGroup.add(multiplyButton); operatorGroup.add(divideButton); operatorGroup.add(mixButton); selectOperatorOptionPanel.add(addButton); selectOperatorOptionPanel.add(minusButton); selectOperatorOptionPanel.add(multiplyButton); selectOperatorOptionPanel.add(divideButton); selectOperatorOptionPanel.add(mixButton); } public void setBottomPanel() { bottomPanel.setLayout(new GridLayout(0,1)); bottomPanel.add(errorInfo); bottomPanel.add(startButton); } //添加开始按钮处理事件 public void addStartEvent() { startButton.addActionListener(new StartButtonListener()); } //内部类，实现开始事件 class StartButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { ar.v.clear();//清空向量 char operator = '+';//默认加法 if(minusButton.isSelected()) { operator = '-'; } else if(multiplyButton.isSelected()) { operator = '*'; } else if (divideButton.isSelected()) { operator = '/'; } else if (mixButton.isSelected())//混合运算 { operator = '.'; } try { int numOfEquation = Integer.parseInt(inputNumField.getText()); int bigOfEquation = Integer.parseInt(inputBitField.getText()); int minSeted = Integer.parseInt(inputByminutes.getText()); int secSeted = Integer.parseInt(inputByseconds.getText()); long millisSeted = (minSeted *60 + secSeted) * 1000; timer = new TimeThread(millisSeted,timeUse); timer.start(); if(numOfEquation > 100) throw new NumberTooBigException("这么多题，你做的完吗？"); rp.getTotalPage(numOfEquation);//获得总页数 rp.setPageLabel(); if(bigOfEquation > 9) throw new NumberTooBigException("输入的位数太高了"); else if (bigOfEquation == 0) throw new NumberTooBigException("位数不能为0"); while(ar.v.size() < numOfEquation) { ar.produceExpression(bigOfEquation,operator); } OverAllFrame.this.v = ar.v; rp.writeEquationToLabel(); OverAllFrame.this.st.setVisible(false);//开始面板调为不可见 OverAllFrame.this.add(rp,BorderLayout.CENTER); OverAllFrame.this.setVisible(true);//更新窗口 OverAllFrame.this.rp.setVisible(true);//显示做题面板 } catch(NumberFormatException ex) { errorInfo.setText("输入数据类型错误！你必须输入数值数据!,请重新输入："); } catch(NumberTooBigException ex) { errorInfo.setText(ex.getMessage()); } catch(Exception ex) { } } } } //做题中的面板 class RunningPanel extends JPanel { JPanel contentPanel;//存放题目和答案① JPanel buttonsPanel;//存放按钮② JLabel pageLabel; //显示当前页/所有页 Vector<JLabel> expressionGroup;//显示题目①-1 Vector<JTextField> answerGroup;//存放答案①-2 JButton backButton;//上一页②-1 JButton nextButton;//下一页②-2 JButton completeButton; //完成②-3 int totalPage = 1; //总页数 int currentPage = 1;//当前页 public RunningPanel() { this.setLayout(new BorderLayout()); this.initialize(); this.addItem(); this.setContentPanel(); this.setButtonsPanel(); } public void initialize()//初始化 { contentPanel = new JPanel(); buttonsPanel = new JPanel(); pageLabel = new JLabel(); expressionGroup = new Vector<JLabel>(); answerGroup = new Vector<JTextField>(); for(int i = 0; i < 10 ;i++) { expressionGroup.add(new JLabel()); answerGroup.add(new JTextField()); } backButton = new JButton("上一页"); nextButton = new JButton("下一页"); completeButton = new JButton("完成!"); backButton.addActionListener(new BackButtonListener()); nextButton.addActionListener(new NextButtonListener()); completeButton.addActionListener(new CompleteButtonListener()); } public void setContentPanel() { contentPanel.setLayout(new GridLayout(6,2)); for(int i = 0; i < 10; i++) { contentPanel.add(expressionGroup.get(i)); contentPanel.add(answerGroup.get(i)); } } public void setPageLabel() { pageLabel.setText("页码"+currentPage+'/'+totalPage); } public void setButtonsPanel() { buttonsPanel.add(backButton); buttonsPanel.add(nextButton); buttonsPanel.add(completeButton); } public void writeEquationToLabel()//写入算式 { //因为只有十个标签，n道题目，不能一一对应，下面是标签要加上的数和题目号对应 int numNeededToAdd = (currentPage-1)*10; for(int i = 0; i < 10 ; i++) { if( i+numNeededToAdd >= v.size())//没有更多题目了 { expressionGroup.get(i).setText(String.format("%17s","N/A")); } else { String temp = String.format("%5d%5s%5d%5s",v.get(i+numNeededToAdd).a, v.get(i + numNeededToAdd).operator, v.get(i + numNeededToAdd).b,"="); expressionGroup.get(i).setText(temp); } } } public void addItem()//添加控件 { this.add(pageLabel,BorderLayout.NORTH); this.add(contentPanel,BorderLayout.CENTER); this.add(buttonsPanel,BorderLayout.SOUTH); } public void getTotalPage(int num)//获得总页数 { totalPage = num/10 + (num % 10 == 0 ? 0:1); } //设置当前页为1，重做和继续的时候用到 public void setCurrentPageToOne() { currentPage = 1; } public void writeInputToVector() throws NumberFormatException//写入答案进向量 { //因为只有十个标签，n道题目，不能一一对应，下面是标签要加上的数和题目号对应 int numNeededToAdd = (currentPage-1)*10; for (int i = 0; i < 10 && i+numNeededToAdd <v.size();i++) { try { if(!answerGroup.get(i).getText().equals(""))//如果不是啥也没写的话 { v.get(i+numNeededToAdd).d = Integer.parseInt(answerGroup.get(i).getText()); if(v.get(i+numNeededToAdd).d == v.get(i + numNeededToAdd).c) v.get(i+numNeededToAdd).is_right = true; } //否则就是默认的-1 } catch(NumberFormatException e) { answerGroup.get(i).setText("输入数据类型错误！请重新输入："); throw e;//必须这么写才能终止。。 } catch(Exception e) { answerGroup.get(i).setText("未知错误！请重新输入："); try { throw e; } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); }//必须这么写才能终止。。 } } } public void clearAnswer()//清空答案 { for (int i = 0; i < answerGroup.size();i++) { answerGroup.get(i).setText(""); } } //写入答案进输入区，还原上下页做过的答案用 public void writeAnswerTofield() { //因为只有十个标签，n道题目，不能一一对应，下面是标签要加上的数和题目号对应 int numNeededToAdd = (currentPage-1)*10; for(int i = 0; i < 10 && i+numNeededToAdd <v.size(); i ++) { if(v.get(i+numNeededToAdd).d != -1)//说明有输入过值 { answerGroup.get(i).setText(Integer.toString(v.get(i+numNeededToAdd).d)); } } } public void complete()//完成做题，用户点击完成或者 是时间到了 { try { //因为第一句可能会产生异常，不过在句中已经处理，这里加上 //try是让它停止进入下一页 timer.setStop();//计时器线程停止 OverAllFrame.this.rp.writeInputToVector();//写入答案进向量 OverAllFrame.this.ar.writeInfo(v.size(), userName); OverAllFrame.this.rp.setVisible(false);//设置做题界面不可见 OverAllFrame.this.ep.setDisplayAnswer(); //设置要显示的结果 OverAllFrame.this.add(ep,BorderLayout.CENTER); OverAllFrame.this.setVisible(true); OverAllFrame.this.ep.setVisible(true);//显示答案面板 } catch(Exception e) { //do nothing } } class CompleteButtonListener implements ActionListener { public void actionPerformed(ActionEvent ae) { complete(); } } class BackButtonListener implements ActionListener { public void actionPerformed(ActionEvent ae) { if(currentPage > 1) { writeInputToVector();//保存上页数据 clearAnswer();//删除上页答案 currentPage --; setPageLabel();//更新页码 writeEquationToLabel();//读入下页算式 writeAnswerTofield();//读入下页已填写答案 RunningPanel.this.setVisible(true);//更新窗口 } } } class NextButtonListener implements ActionListener { public void actionPerformed(ActionEvent ae) { if(currentPage < totalPage) { writeInputToVector(); clearAnswer();//删除上页答案 currentPage ++; setPageLabel(); writeEquationToLabel(); writeAnswerTofield(); RunningPanel.this.setVisible(true); } } } } //显示结果面板 class EndPanel extends JPanel { JScrollPane displayArea;//显示区域 JPanel bottomArea; //底部区域，存放按钮 JTextArea displayAnswer;//显示答案和评分 JTextArea displayRank; //显示排名和得分 JButton reDoButton;//重做 JButton continueButton;//继续练习 JButton viewRankButton;//查看排名 Font answerFont ; //字体属性 boolean isRankViewed = false;//是否查看过排名 boolean alreadyWrite = false;//已经写入排名信息 public EndPanel() { this.setLayout(new BorderLayout());//边界布局 this.initialize(); this.setBottomArea(); this.addItem(); } public void initialize()//初始化 { answerFont = new Font("宋体",Font.PLAIN,15); displayAnswer = new JTextArea(); displayAnswer.setFont(answerFont);//设置字体 displayArea = new JScrollPane(displayAnswer); displayRank = new JTextArea(); displayRank.setFont(answerFont); bottomArea = new JPanel(); reDoButton = new JButton("重做一遍"); continueButton = new JButton("继续练习"); viewRankButton = new JButton("查看排名"); reDoButton.addActionListener(new ReDoButtonListener()); continueButton.addActionListener( new ContinueButtonListener()); viewRankButton.addActionListener(new viewRankButtonListener()); } public void setDisplayAnswer()//添加答案 { displayAnswer.setEditable(false);//只显示答案，不可编辑 String temp ; int score = 0; temp = (String.format("%5s%5s%5s%5s%5s%10s%5s","","", "","","正确答案","你的答案","判断")) + "\r\n"; displayAnswer.append(temp); for(int i = 0 ;i < v.size() ;i++) { temp = (String.format("%5d%5s%5d%5s%10d%10d%10s",v.get(i).a,v.get(i).operator, v.get(i).b,"=",v.get(i).c,v.get(i).d,(v.get (i).is_right ? "正确":"错误")))+ "\r\n"; displayAnswer.append(temp); if(v.get(i).is_right) { score += 100.0/v.size(); } } temp = ("你的总分：" + score +"\r\n"); displayAnswer.append(temp); } public void setDisplayRank() { if(alreadyWrite)//如果已经执行过了 return; alreadyWrite = true; viewRankButton.setText("查看答案"); displayRank.setEditable(false); FileReader file ; BufferedReader bf ; String tempString;//临时用户名 String tempIntedString;//临时分数的String形式 double tempInt;//临时分数 //用户名和用户最高分的映射关系 HashMap<String,Double> map = new HashMap<String,Double>(); try { file = new FileReader("UserNameAndScore.data"); if(!file.ready()) { displayRank.setText("无有效数据"); } bf = new BufferedReader(file); tempString=bf.readLine(); tempIntedString=bf.readLine(); while( tempString!= null && tempIntedString != null) { tempInt = Double.parseDouble(tempIntedString); //确保显示的为每个人历史所得最高分 if(!(map.containsKey(tempString) && tempInt <= map.get(tempString))) { map.put(tempString, tempInt); } tempString=bf.readLine(); tempIntedString=bf.readLine(); } } catch (Exception e) { System.out.println(e.getMessage()); viewRankButton.setText("文件异常"); } Vector<UserRankInfo> v = new Vector<UserRankInfo>(); Iterator<String> it = map.keySet().iterator(); UserRankInfo temp; while(it.hasNext()) { tempString = it.next(); temp = new UserRankInfo(tempString,map.get(tempString)); v.add(temp); } Collections.sort(v,new UserRankInfo()); int rank = 1; displayRank.append(String.format("%10s%10s%10s", "排名","用户名","得分")+ "\r\n"); for(UserRankInfo u:v) { displayRank.append(String.format("%10d%15s%15f", rank++,u.userName,u.score)+ "\r\n"); } } public void setBottomArea()//添加底部按钮 { bottomArea.setLayout(new FlowLayout()); bottomArea.add(reDoButton); bottomArea.add(continueButton); bottomArea.add(viewRankButton); } public void addItem()//添加组件 { this.add(displayArea,BorderLayout.CENTER); this.add(bottomArea,BorderLayout.SOUTH); } public void recoverAnswerArea()//恢复答案区域 { viewRankButton.setText("查看排名"); displayArea.setViewportView(displayAnswer); displayAnswer.setVisible(true); isRankViewed = false; } class ReDoButtonListener implements ActionListener { public void actionPerformed(ActionEvent ae) { OverAllFrame.this.rp.setCurrentPageToOne();//设置当前页码 为1 OverAllFrame.this.ep.setVisible(false);//隐藏结果面板 OverAllFrame.this.rp.clearAnswer();//先清除做题面板的内容 OverAllFrame.this.rp.setVisible(true);//显示做题面板 if(isRankViewed) recoverAnswerArea(); } } class ContinueButtonListener implements ActionListener { public void actionPerformed(ActionEvent ae) { OverAllFrame.this.rp.setCurrentPageToOne();//设置当前页码 为1 OverAllFrame.this.rp.clearAnswer();//先清除做题面板的内容 OverAllFrame.this.ep.setVisible(false);//隐藏结果面板 OverAllFrame.this.st.setVisible(true);//显示开始面板 if(isRankViewed) recoverAnswerArea(); } } class viewRankButtonListener implements ActionListener { @Override public void actionPerformed(ActionEvent e) { if(!isRankViewed ) { setDisplayRank();//写入排名信息 displayAnswer.setVisible(false); displayArea.setViewportView(displayRank); displayRank.setVisible(true); isRankViewed = true; } else { recoverAnswerArea(); } } } //实现比较接口的用户排名类 class UserRankInfo implements Comparator<UserRankInfo> { public String userName; public double score; public UserRankInfo(String userName,double score) { this.userName = userName; this.score = score; } public UserRankInfo() { //none } @Override public int compare(UserRankInfo arg0, UserRankInfo arg1) { if(arg0.score < arg1.score) return 1; else if(arg0.score > arg1.score) return -1; return 0; } } } }
总结：
合作同伴32马志磊：http://www.cnblogs.com/mac54321/
因为之前的四则运算是用C语言写的，这次的结对要做界面，所以为了做界面方便，就推到了之前的代码重新做java版本的四则运算，在本次的java版本上 构思吸取了 之前C语言版本的想法，仍然是让用户选择加法还是减法还是其他。因为这样模块性比较好，逻辑比较清晰。在做这个版本的时候框架和界面花了比较长的时间，但是还是一部分占比比较大的就是考虑容错性的问题，起码30%的时间都在考虑用户会怎么输错，虽然实际应用中可能用不到，但是这也是很必须的，最后添加的排名功能，虽然只是一点小小的改进，但是结合了用户帐号输入的功能，使得其发挥应有的作用，不然用户帐号输入就没有什么意义了。进过此次学习之后，发觉了，两个人编程的精巧之处，毕竟如果是单独写代码，自己错了自己是很难看出来的，两个人写的话，有问题能及时提出来，使得不会陷入泥潭，等麻烦大了才反映过来，那就晚了，而且这次本来是预计一个星期的时间完成的，但是考虑到时间的紧迫性，我们还是提前完成了，对于其他组，我也去看了看，很多是因为做的顺序导致了时间的延缓甚至回炉重做，比如说先写了很多功能，然后再写界面才发现很多适配性的问题，又要根据界面去改功能，对于此，我们组的策略还是按照现代软件工程里介绍的，先做可行性分析，再敲代码，而不是一上来就写代码，所以我们的弯路少走了一些，时间自然提前了一点。经过这次之后，发觉了很多时候不是技术性的问题，毕竟技术性的问题请教一下，或者上网看看，都能解决，很多时候是经验不足，还有缺少规范化而导致了种种小问题，然而很多小问题不能及时处理，最后导致了出现瓶颈，所以以后我还是要注意一下这方面。
这个四则运算程序扩展的方向主要有：
1.计时，还有自由限定做题提示，还有完成时候提醒用时多少。
2.答题完成的时候显示做对哪道题，做错哪道题，正确答案多少，当初自己写的答案多少。
3.设置了用户登陆名，这有个好处，可以记录其他用户的做题记录，并且构成一个排行，内部用hashmap实现，提升趣味。
4.整个界面清晰易懂
缺点：1.没有做到多个运算符，使得题目难度无法提升
2.没有做到计算到小数，主要是当初定义为整型，这个在后面没有修改。
3.没有做界面换肤功能。
时间分析：http://www.cnblogs.com/kasion/p/4398918.html