非常实用的java自动答题计时计分器

package autoScore; 
 
 
import java.awt.Color; 
import java.awt.Font; 
import java.awt.Label; 
import java.awt.List; 
import java.awt.TextField; 
import java.awt.event.ActionEvent; 
import java.awt.event.KeyEvent; 
import java.awt.event.KeyListener; 
import java.text.DecimalFormat; 
 
 
import javax.swing.JFrame; 
 
public class AutoScore extends JFrame{ 
 Label labRule=new Label();//规则描述标签 
 Label labA=new Label();//第一个数字标签 
 Label labOp=new Label();//加减乘除标签 
 Label labB=new Label();//第二个数字标签 
 Label label5=new Label();//等于号“＝”标签 
 Label labWarn=new Label();//输入合法性校验提示标签 
 Label labQues=new Label();//答题列表标签 
 Label labResult=new Label();//判分标签 
 TextField txtAnswer=new TextField();//输入答案输入框 
  
 int total=0;//记录答题总数 
 int right=0;//记录答题正确数量 
 int error=0;//记录答题错误数量 
 int score=0;//记录答题总分 
 boolean isOver=false;//一轮结束后标识 
 boolean isFirst=true;//程序第一次运行标识 
  
 long startTime;//每一轮运行开始时间 
  
 List listDisp=new List();//答题列表展示框 
 List listScore=new List();//分数展示框 
  
 public static void main(String[] args){ 
  AutoScore score=new AutoScore(); 
 } 
  
 public AutoScore(){ 
  init(); 
  setSize(450,630); 
  setDefaultCloseOperation(EXIT_ON_CLOSE); 
  setVisible(true); 
 } 
   
 public void init(){ 
  setLayout(null); 
  setSize(450,630); 
  
  labRule.setText("规则：每组十道题，每题10分，按ENTER键开始，小数保留2位"); 
  labRule.setBounds(36, 10, 390, 72); 
  labRule.setFont(new Font("Dialog",Font.PLAIN,12)); 
  getContentPane().add(labRule); 
   
  labA.setText("x"); 
  labA.setBounds(36,82,36,36); 
  labA.setFont(new Font("Dialog",Font.PLAIN,24)); 
  getContentPane().add(labA); 
   
  labOp.setText("+"); 
  labOp.setFont(new Font("Dialog",Font.PLAIN,24)); 
  labOp.setBounds(72, 82, 45, 36); 
  getContentPane().add(labOp); 
   
  labB.setText("y"); 
  labB.setFont(new Font("Dialog",Font.PLAIN,24)); 
  labB.setBounds(118, 82, 33, 36); 
  getContentPane().add(labB); 
   
  label5.setText("="); 
  label5.setFont(new Font("Dialog",Font.PLAIN,24)); 
  label5.setBounds(168, 82, 24, 36); 
  getContentPane().add(label5); 
   
   
  labWarn.setFont(new Font("Dialog",Font.PLAIN,12)); 
  labWarn.setBackground(Color.RED); 
  labWarn.setBounds(320, 82, 80, 36); 
  labWarn.setVisible(false); 
  getContentPane().add(labWarn); 
   
  labQues.setText("答题列表："); 
  labQues.setFont(new Font("Dialog",Font.PLAIN,12)); 
  labQues.setBounds(36, 148, 100, 20); 
  getContentPane().add(labQues); 
   
  labResult.setText("分数统计："); 
  labResult.setFont(new Font("Dialog",Font.PLAIN,12)); 
  labResult.setBounds(36,420,100,20); 
  labResult.setVisible(false); 
  getContentPane().add(labResult); 
   
  txtAnswer.setFont(new Font("Dialog",Font.PLAIN,24)); 
  txtAnswer.setBounds(216, 82, 100, 36); 
  getContentPane().add(txtAnswer); 
   
   
  listDisp.setFont(new Font("Dialog",Font.PLAIN,16)); 
  listDisp.setBounds(36, 174, 282, 230); 
  getContentPane().add(listDisp); 
   
  listScore.setFont(new Font("Dialog",Font.PLAIN,16)); 
  listScore.setBounds(36,450,282,135); 
   
  MyKey myKey=new MyKey();// 答案输入框，键盘按键监听类 
  txtAnswer.addKeyListener(myKey); 
   
 } 
  
 class MyKey implements KeyListener{ 
 
  @Override 
  public void keyTyped(KeyEvent e) { 
    
  } 
 
  @Override 
  public void keyPressed(KeyEvent e) { 
   if(e.getSource()==txtAnswer){ 
    if(e.getKeyCode()==KeyEvent.VK_ENTER){ 
     if(isOver || isFirst){ 
      updateQuestion(null); 
     }else if("".equals(txtAnswer.getText())){ 
      labWarn.setText("请输入答案！"); 
      labWarn.setVisible(true); 
     }else{ 
      labWarn.setVisible(false); 
      if(!isNumber(txtAnswer.getText())){ 
       labWarn.setText("请输入数字！"); 
       labWarn.setVisible(true); 
      }else if(total<9){ 
       judge(null); 
       updateQuestion(null); 
      }else{ 
       judge(null); 
       labResult.setVisible(true); 
       scorePerformed(null); 
      } 
     } 
    } 
   } 
    
  } 
 
  @Override 
  public void keyReleased(KeyEvent e) { 
    
  } 
   
 } 
  
  
 int a=0,b=0; 
 String op=""; 
 double result=0; 
 DecimalFormat df=new DecimalFormat("#.00"); 
 /** 
  * 出题方法 
  * @param e 
  */ 
 public void updateQuestion(ActionEvent e){ 
  if(isFirst){ 
   startTime=System.currentTimeMillis(); 
  } 
  if(isOver==true){ 
   listDisp.clear(); 
   listScore.clear(); 
   labResult.setVisible(false); 
   listScore.setVisible(false); 
  } 
  isOver=false; 
  a=(int)(Math.random()*9+1); 
  b=(int)(Math.random()*9+1); 
  int c=(int)(Math.random()*4); 
  switch (c) { 
  case 0: 
   op="+"; 
   result=a+b; 
   break; 
  case 1: 
   op="-"; 
   result=a-b; 
   break; 
  case 2: 
   op="*"; 
   result=a*b; 
   break; 
  case 3: 
   op="/"; 
   result=(a*1.0)/b; 
   //若两个数除不尽，则按四舍五入保留2位小数 
   if(String.valueOf(result).length()>10){ 
    result=Double.parseDouble(df.format((a*1.0)/b)); 
   } 
   break; 
  } 
  labA.setText(String.valueOf(a)); 
  labB.setText(String.valueOf(b)); 
  labOp.setText(op); 
  label5.setText("="); 
  txtAnswer.setText(""); 
  isFirst=false; 
   
 } 
 /** 
  * 判断结果 
  * @param e 
  */ 
 public void judge(ActionEvent e){ 
  try{ 
   double value=Double.parseDouble(txtAnswer.getText()); 
   String resultStr=(total+1)+"、 "+a+op+b+"="+value; 
   if(value==result){ 
    resultStr+=" \t正确"; 
    right++; 
    score+=10; 
   }else{ 
    resultStr+=" \t错误 正确答案："+result; 
    error++; 
   } 
   listDisp.add(resultStr); 
   total++; 
  }catch(NumberFormatException ignored){ 
  } 
 } 
 /** 
  * 统计分数 
  * @param e 
  */ 
 public void scorePerformed(ActionEvent e){ 
  isOver=true; 
  listScore.clear(); 
  listScore.setVisible(true); 
  String exitStr="本次共答题"+total+"道"; 
  listScore.add(exitStr); 
  listScore.add("累计用时："+(System.currentTimeMillis()-startTime)/1000+"秒"); 
  listScore.add("答对："+right+"个"); 
  listScore.add("答错："+error+"个"); 
  listScore.add("得分："+score+"分"); 
  getContentPane().add(listScore); 
  score=0; 
  right=0; 
  error=0; 
  total=0; 
   
 } 
  
 /** 
  * 校验输入是否位数字 
  * @param numberStr 
  * @return 
  */ 
 public boolean isNumber(String numberStr){ 
  boolean isNumber=true; 
  try{ 
   Double.parseDouble(numberStr); 
  }catch(NumberFormatException e){ 
   isNumber=false; 
  } 
  return isNumber; 
 } 
}