Java 在SWING中倒数结束时如何调用另一帧

我正在用JavaSwing制作一个考试系统桌面应用程序。 我有一个名为“show\u class\u question”的框架。 此框架用于显示数据库中的问题和四个选项。 每当用户单击“下一步”按钮时，我都会一次又一次地调用同一个框架（show_class_question）（自引用）直到问题总数（比如20个）

show\u class\u question（用户单击其上的下一步按钮）-->show\u class\u question

现在我想添加一个倒计时计时器，它的值将从数据库中检索。我在数据库的int列中存储了分钟数。 每当用户单击“下一步”按钮时，剩余时间将与其他值一起传递到同一帧（show_class question）

除非用户：

回答所有问题

或点击“结束考试”按钮

或者当倒计时变为零时

当上述任何情况发生时，我想调用“user\u Result”框架

我的问题是，每当用户单击“下一步”按钮时，我无法以正确的方式度过剩余时间。 虽然我设法操纵了从互联网上获得的倒计时代码，并在下一帧上度过了剩余的时间，但“user_Result”帧被调用了好几次。假设我在“show_class_question”上点击了7次“Next”按钮，“user_Result”框被调用了7次，甚至在倒计时为零之前

我把我的代码贴在下面，我要求你纠正它，或者是足够的基因，并为我提供一个更好的和正确的方法来做这件事

-谢谢你

public class Show_class_question extends javax.swing.JFrame {

private Timer timer;
String header_name;
String class_name;
String stream_name;
String u_id;
String mix_course_header;
int d=0;

public void end_exam()
{
 truncate_table();
        User_result ur = new User_result(score, no_of_quest_answered, header_name, mix_course_header,  u_id, negative_marking, points_awarded, points_deducted, difficulty_level, no_of_correct_answers, total_no_of_ques);
        ur.setVisible(true);
        this.dispose();
}
public void truncate_table()
 {
     try {
        Class.forName("com.mysql.jdbc.Driver");
         Connection con = DriverManager.getConnection(Connection_const.DB_URL,Connection_const.USER_NAME,Connection_const.PASSWORD);
         Statement st = con.createStatement();

         String sqla = "TRUNCATE TABLE asked_ques_table";
         st.executeUpdate(sqla);

    } catch (Exception e) {
    }

}


/*
 * Declaring publics strings for op1 2 3 4 and answer
 */
String ques = null;
String q_id = null;
String op1 = null;
String op2 = null;
String op3 = null;
String op4 = null;
String answer = null;

// declaring logical variables
int flag;
float score;
int no_of_quest_answered;
int no_of_correct_answers;

//Exam pattern variables
String difficulty_level;
 int total_no_of_ques;
 int time_limit;
 int points_awarded;
 int negative_marking; // 0 --> no, 1 --> yes
 float points_deducted;


 // countdown variables

long remaining;
long passed;
long limit;

/**
 * Creates new form Show_class_question
 */
public Show_class_question() {
    initComponents();
}

// our new constructor

public Show_class_question(String h_name, String pclass_name, String pstream_name, int pflag, String pu_id) {
    header_name = h_name;
    class_name = pclass_name;
    stream_name = pstream_name;
    u_id = pu_id;
    flag = pflag;
    initComponents();
}


//self refrencing constructor
public Show_class_question(int pflag, float pscore, int p_no_of_ques_ans, String pq_id, String pclass_name, String pstream_name, String namelb,  String pu_id, int pno_of_correct_ans,  long plimit,long ppassed)
{
    flag = pflag;
    score = pscore;
    no_of_quest_answered = p_no_of_ques_ans;
    q_id = pq_id;
    class_name = pclass_name;
    stream_name = pstream_name;
    header_name = namelb;
    u_id = pu_id;
    no_of_correct_answers = pno_of_correct_ans;
    //remaining = premaining;
   passed = ppassed;
    limit = plimit;
    System.out.println("rem inside cons= "+remaining);


    //x2 = px;

    System.out.println("d cls name= "+class_name);
    System.out.println("d strm name= "+stream_name);

    System.out.println("flag value at top  = "+flag);
    System.out.println("score value at top  = "+score);
    System.out.println("no_of_q_a value at top  = "+no_of_quest_answered);
    System.out.println("q_id value at top  = "+q_id);

    initComponents(); 
}


private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:
  limit=remaining;

    String user_answer;
    if (flag == 0) {

        score = 0;
        no_of_quest_answered = 0;
    }

    if (jRadioButton2.isSelected()) {
        user_answer = jRadioButton2.getText();
    } else if (jRadioButton3.isSelected()) {
        user_answer = jRadioButton3.getText();
    } else if (jRadioButton4.isSelected()) {
        user_answer = jRadioButton4.getText();
    } else if (jRadioButton5.isSelected()) {
        user_answer = jRadioButton5.getText();
    } else {
        user_answer = null;
    }


    //checking answer and answered or not

    if (user_answer != null) {

        no_of_quest_answered++;
       if(negative_marking==0)
        {
            if(user_answer.equals(answer))
            {
                score=score+(1*points_awarded);
                no_of_correct_answers++;
             }
        }
        else if(negative_marking==1)
        {
             if(user_answer.equals(answer))
            {
                 score=score+(1*points_awarded);
                 no_of_correct_answers++;

            }
             else
             {
                 score= (score-points_deducted);

             }
        } 
    }

    flag++;
    System.out.println("flag value at bottom  = " + flag);

    if (flag < total_no_of_ques) //starting frm 0
    {

        Show_class_question s_c_q = new Show_class_question(flag, score, no_of_quest_answered, q_id, class_name, stream_name,  header_name, u_id,no_of_correct_answers,  limit, passed);
        s_c_q.setVisible(true);
        this.dispose();
    } else {
        truncate_table();
        User_result ur = new User_result(score, no_of_quest_answered, header_name, mix_course_header,  u_id, negative_marking, points_awarded, points_deducted, difficulty_level, no_of_correct_answers, total_no_of_ques);
        ur.setVisible(true);
        this.dispose();
    }
}                                        

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:

    // user ended exam in between

    int response = JOptionPane.showConfirmDialog(rootPane, "You will not be able to answer any more questions. Continue?");
    if(response==0)
    {
     truncate_table();
    User_result ur = new User_result(score, no_of_quest_answered, header_name, mix_course_header,  u_id, negative_marking,points_awarded,points_deducted,difficulty_level,no_of_correct_answers,total_no_of_ques);
    ur.setVisible(true);
    this.dispose();
    }
}                                        

private void formWindowOpened(java.awt.event.WindowEvent evt) {                                  
    // TODO add your handling code here:

    try{
         Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection(Connection_const.DB_URL,Connection_const.USER_NAME, Connection_const.PASSWORD);
        Statement st = con.createStatement();

        String sql6  = "SELECT pattern_id FROM exam_pattern_in_use WHERE pid = '1' ";
         ResultSet rs6 = st.executeQuery(sql6);
         String pattern_id = null;
         while(rs6.next())
         {
              pattern_id = rs6.getString("pattern_id");
         }
           String sq5 = "SELECT * FROM exam_pattern WHERE pattern_id='"+pattern_id+"' ";
         ResultSet rs5 = st.executeQuery(sq5);
         String db_diff_lev = null;
         String db_time_limit = null;
         String db_tot_ques = null;
         String db_points_award = null;
         String db_neg_marking = null;
         String db_points_ded = null;

         while(rs5.next())
         {
             db_diff_lev = rs5.getString("difficulty_level");
             db_tot_ques = rs5.getString("tot_no_of_ques");
             db_time_limit = rs5.getString("time_limit");
             db_points_award = rs5.getString("points_awarded_for_correct_ans");
             db_neg_marking = rs5.getString("negative_marking");
             db_points_ded = rs5.getString("points_deduced_for_wrong_ans");
         }
         int my_time_limit = Integer.parseInt(db_time_limit);
         System.out.println("my time lim = "+my_time_limit);


    ////------------------------->timer code start here
    final long current = System.currentTimeMillis();

    try {
        if(flag==0)
            limit = my_time_limit*1000; // X seconds

             timer = new Timer(1000, new ActionListener() {
             public void actionPerformed(ActionEvent event) {
             long time = System.currentTimeMillis();
             passed = time - current;
             remaining = limit - passed;
             System.out.println("rem time ="+remaining);

          if(remaining >= 1) {
              long seconds = remaining/1000;
            long minutes = seconds/60;
            long hours = minutes/60;
            jLabel13.setText(String.format("%02d:%02d:%02d", hours, minutes, seconds%60));


          } else {

           timer.stop();
           timer.setRepeats(false);
           truncate_table();
           setVisible(false);
           dispose();
        User_result ur = new User_result(score, no_of_quest_answered, header_name, mix_course_header,  u_id, negative_marking, points_awarded, points_deducted, difficulty_level, no_of_correct_answers, total_no_of_ques);
        ur.setVisible(true);
           d=1;
        }

       }

        });

      timer.start();

    } catch(NumberFormatException nfe) {
      // debug/report here

      nfe.printStackTrace();
    }

    ////------------------------->timer code end here


    setTitle("Question: "+(flag+1));
    headernmlb.setText(header_name);
    class_name_lb.setText(class_name);
    jLabel10.setText(stream_name);
    mix_course_header = class_name+"-"+stream_name;




    if(flag==0)
    {
        jButton3.setVisible(true);
    }
    else
    {
        jButton3.setVisible(false);
    }

          /*  if(d==1)
                  {
                        truncate_table();
                        User_result ur = new User_result(score, no_of_quest_answered, header_name, mix_course_header,  u_id, negative_marking, points_awarded, points_deducted, difficulty_level, no_of_correct_answers, total_no_of_ques);
                        ur.setVisible(true);
                        this.dispose();
                  }
    */

         difficulty_level = db_diff_lev;
         total_no_of_ques = Integer.parseInt(db_tot_ques);
         points_awarded = Integer.parseInt(db_points_award);
         negative_marking =  Integer.parseInt(db_neg_marking);
         points_deducted =  Float.parseFloat(db_points_ded);
         System.out.println("fractional points ded = "+points_deducted);


          String sql = "SELECT s_id FROM school_stream_level WHERE course_name = '"+class_name+"' and stream_name = '"+stream_name+"' ";
          // s_id in class_question_table = c_id in course_level
          // dono 1 hi cheez represent kar rahe he
          // dono me FK relationship he


           ResultSet rs = st.executeQuery(sql);

           String s_id=null;

         while(rs.next())
         {
              s_id = rs.getString("s_id");
         }

          String sql2;

         if(flag==0)
         {
             sql2 = "SELECT * FROM class_ques_table WHERE s_id = '"+s_id+"' and  difficulty_level = '"+difficulty_level+"' ORDER BY RAND() LIMIT 1";

         }
         else
         {
                  sql2 = "SELECT * FROM class_ques_table WHERE s_id = '"+s_id+"' and  difficulty_level = '"+difficulty_level+"' and q_id NOT IN(SELECT q_id FROM asked_ques_table) ORDER BY RAND() LIMIT 1";
         }


          ResultSet rs2 =st.executeQuery(sql2);
          System.out.println("under rs2");

              while(rs2.next())
              {
                   ques = rs2.getString("question");
                   q_id = rs2.getString("q_id");
                   op1 = rs2.getString("op1");
                   op2 = rs2.getString("op2");
                   op3 = rs2.getString("op3");
                   op4 = rs2.getString("op4");
                   answer = rs2.getString("answer");
                   System.out.println("q_id db = "+q_id);
              }

                  jLabel7.setText(""+(flag+1));
                  queslb.setText(ques);
                  jRadioButton2.setText(op1);
                  jRadioButton3.setText(op2);
                  jRadioButton4.setText(op3);
                  jRadioButton5.setText(op4);


                  String sql00 = "INSERT INTO asked_ques_table VALUES('0', '"+q_id+"')";
                  st.executeUpdate(sql00);



    }
    catch(Exception e){

    }
}                                 

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:
    if (flag == 0) {
        //   jButton3.setVisible(true);
        School_stream_selection s_s_s = new School_stream_selection(header_name, class_name, u_id);
        s_s_s.setVisible(true);
        dispose();

    }

}                                        

private void jLabel1FocusGained(java.awt.event.FocusEvent evt) {                                    
    // TODO add your handling code here:
}                                   

...and few more lines...

public class Show\u class\u问题扩展了javax.swing.JFrame{
私人定时器；
字符串头名称；
字符串类名称；
字符串流名称；
字符串u_id；
字符串混合\课程\标题；
int d=0；
公开考试
{
截断表（）；
用户结果ur=新用户结果（分数、未回答的任务、标题名称、混合课程标题、id、负面评分、得分、扣分、难度等级、未回答正确答案、问题总数）；
ur.setVisible（真）；
这个。dispose（）；
}
公共void truncate_表（）
{
试一试{
Class.forName（“com.mysql.jdbc.Driver”）；
Connection con=DriverManager.getConnection（连接常数DB\u URL、连接常数用户名、连接常数密码）；
语句st=con.createStatement（）；
String sqla=“TRUNCATE TABLE ask\u ques\u TABLE”；
st.executeUpdate（sqla）；
}捕获（例外e）{
}
}
/*
*为op1 2 3 4声明publics字符串并回答
*/
字符串ques=null；
字符串q_id=null；
字符串op1=null；
字符串op2=null；
字符串op3=null；
字符串op4=null；
字符串应答=null；
//声明逻辑变量
int标志；
浮点数；
回答的任务的整数否；
int无正确答案；
//考试模式变量
串级难度；
整数总数（数量）；
整数时间限制；
积分;；
int负标记；//0-->否，1-->是
扣除浮点数；
//倒计时变量
长期存在；
早已过去；
长限；
/**
*创建新表单Show\u class\u问题
*/
公开表演课问题（）{
初始化组件（）；
}
//我们的新构造
公共显示类问题（字符串h_名称、字符串pclass_名称、字符串pstream_名称、int pflag、字符串pu_id）{
标题名称=h\U名称；
类别名称=类别名称；
流名称=流名称；
u_id=pu_id；
flag=pflag；
初始化组件（）；
}
//自引用构造函数
公共显示类问题（整数pflag、浮点pscore、整数pu no_of_ques_ans、字符串pq_id、字符串pclass_name、字符串pstream_name、字符串namelb、字符串pu id、整数pno_of_correct_ans、长plimit、长ppassed）
{
flag=pflag；
分数=pscore；
没有任务的回答=没有问题的回答；
q_id=pq_id；
类别名称=类别名称；
流名称=流名称；
标题_name=namelb；
u_id=pu_id；
无正确答案=无正确答案；
//剩余=预培训；
通过=通过；
极限=plimit；
System.out.println（“rem-inside-cons=“+剩余”）；
//x2=px；
System.out.println（“d cls name=“+class_name”）；
System.out.println（“d strm name=“+stream\u name”）；
System.out.println（“顶部的标志值=”+标志）；
System.out.println（“顶部的分数值=”+分数）；
System.out.println（“顶部数值的否=”+回答的任务的否）；
System.out.println（“顶部的q_id值=”+q_id）；
初始化组件（）；
}
私有void jButton1ActionPerformed（java.awt.event.ActionEvent evt）{
//TODO在此处添加您的处理代码：
限制=剩余；
字符串用户应答；
如果（标志==0）{
得分=0；
没有回答的任务=0；
}
if（jRadioButton2.isSelected（））{
user_answer=jRadioButton2.getText（）；
}else if（jRadioButton3.isSelected（））{
user_answer=jRadioButton3.getText（）；
}else if（jRadioButton4.isSelected（））{
user_answer=jRadioButton4.getText（）；
}else if（jRadioButton5.isSelected（））{
user_answer=jRadioButton5.getText（）；
}否则{
user_answer=null；
}
//检查答案与否
if（用户回答！=null）{
没有任务回答++；
如果（负_标记==0）
{
if（用户回答等于（回答））
{
分数=分数+（1*分）；
没有正确答案++；
}
}
else if（负_标记==1）
{
if（用户回答等于（回答））
{
分数=分数+（1*分）；
没有正确答案++；
}
其他的
{
分数=（扣减的分数）；
}
} 
}
flag++；
System.out.println（“底部的标志值=”+标志）；
如果（标志<总数量）//开始frm 0