Opening JFrames as objects one at a time

I have created a program that generates numbers puts them on a JFrame via labels and buttons and closing on the click of the correct answer.
Example of output
......................... *3*
1 + 2 + = ........ *2*
.........................*5*
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class QuestionFrame implements ActionListener
     JFrame jf;
     JButton [] but = new JButton[3];
     int randomPlace = (int)(Math.random()*3);
     QuestionFrame (char level, String picNum)
          Numbers N = new Numbers(level);
          jf = new JFrame ("Question");
          jf.setLayout(null);
          jf.setBounds (50, 200, 700,240);
          jf.setResizable(true);
               JLabel [] lbl = new JLabel[5];
               lbl[0] = new JLabel (N.num1());
                 lbl[1] = new JLabel ("+");
                 lbl[2] = new JLabel (N.num2());
                 lbl[3] = new JLabel ("=");
                 for(int h = 0; h < 4; h++)
                      lbl[h].setBounds (70*(h+1), 80, 30, 30);
                 String [] txt = new String [3];
                 txt[0] = N.falseAns1();
                 txt[1] = N.falseAns2();
                 txt[2] = N.falseAns3();
                 txt[randomPlace] = N.answer();
                 for(int i = 0; i < 3; i++)
                    but= new JButton (txt[i]);
               for(int j = 0; j < 3; j++)
                    int Y = ((j*60)+20);
                    but[j].setBounds(400, Y, 70, 40);
               for(int l = 0; l < 3; l++)
                    but[l].addActionListener(this);
               Container con = jf.getContentPane ();
               con.setLayout(null);
               for(int k = 0; k < 3; k++)
                    con.add(but[k]);
               for(int l = 0; l < 4; l++)
                    con.add(lbl[l]);
               jf.setVisible(true);
     public void actionPerformed (ActionEvent check)
          if (check.getSource () == but[randomPlace])
               jf.dispose();
     public static void main (String[]args)
          char level = (JOptionPane.showInputDialog("Type")).charAt(0);
          QuestionFrame [] qf = new QuestionFrame[10];
          for(int i = 0; i < 10; i++)
               qf[i] = new r(level, i+1+"");
}Just in case you need it here's the Numbers and ImproveNumbers classes I've madepublic class Numbers
     int sumNum1,      sumNum2,      Answer;
     int falseAns1,      falseAns2,      falseAns3;
     public Numbers(char givenLevel)
          int SumNum1 = 0;
          int SumNum2 = 0;
               switch(givenLevel)
               case '1':
                         SumNum1 = (int)(Math.random()*(10+1));
                         SumNum2 = (int)(Math.random()*(9+1));
                         break;
               case '2':
                         SumNum1 = (int)(Math.random()*(40+1));
                         SumNum2 = ((int)(Math.random()*(5+1))+5);
                         break;
               case '3':
                         SumNum1 = (int)(Math.random()*(100+1));
                         SumNum2 = ((int)(Math.random()*(15+1))+5);
                         break;
          int trueAnswer = SumNum1+SumNum2;
          int[] falseAnswer = new int[3];
          for(int j = 0; j <3; j++)
               falseAnswer[j] = ((int)(Math.random()*(15))+trueAnswer)-7;
               if(falseAnswer[j] < 0)
                    falseAnswer[j] = falseAnswer[j]*(-1);
               ImproveNumbers IN = new ImproveNumbers(trueAnswer, falseAnswer[0], falseAnswer[1], falseAnswer[2]);
               falseAnswer[0] = IN.fixNum1();
               falseAnswer[1] = IN.fixNum2();
               falseAnswer[2] = IN.fixNum3();
               sumNum1 = SumNum1;
               sumNum2 = SumNum2;
               Answer = trueAnswer;
               falseAns1 = falseAnswer[0];
               falseAns2 = falseAnswer[1];
               falseAns3 = falseAnswer[2];
     String num1()
               return ""+sumNum1;
     String num2()
               return ""+sumNum2;
     String answer()
               return ""+Answer;
     String falseAns1()
               return ""+falseAns1;
     String falseAns2()
               return ""+falseAns2;
     String falseAns3()
               return ""+falseAns3;
public class ImproveNumbers
     int improvedNum1;
     int improvedNum2;
     int improvedNum3;
     ImproveNumbers(int Answer, int receivedNum1, int receivedNum2, int receivedNum3)
          if(Answer == receivedNum1)
               receivedNum1 = receivedNum1+1;
          for(int p = 0; p < 2; p++)
               if(Answer == receivedNum2)
                    receivedNum2 = receivedNum2+1;
               if (receivedNum1 == receivedNum2)
                    receivedNum2 = receivedNum2+1;
          for(int p = 0; p < 10; p++)
               if(Answer == receivedNum3)
                    receivedNum3 = receivedNum3+1;
               if (receivedNum1 == receivedNum3)
                    receivedNum3 = receivedNum3+1;
               if (receivedNum2 == receivedNum3)
                    receivedNum3 = receivedNum3+1;
          improvedNum1 = receivedNum1;
          improvedNum2 = receivedNum2;
          improvedNum3 = receivedNum3;
     int fixNum1()
               return improvedNum1;
     int fixNum2()
               return improvedNum2;
     int fixNum3()
               return improvedNum3;
I want each questionFrame to open one at a time, as the
preceding one is answered correctly and disposes of itself.
I've search for answers and tried hundreds of combination but I
don't seem to click it.
code should run if copied, but
please don't change too much
or give too complicated code!

Got the hint the first time. But I don't have much time and I'm not too familiar with JDialogs. I am still working on the whole program's appearance and using frames, buttons and labels are easy.
I know I'm nagging, but I also need advice on making a thread sleep.
I have a JFrame with multiple buttons. Certain of them don't work yet. (Not done with them)
If I click on a buttton a frame of warning should appear, but disappear after a Thread.sleep(2000) by using my own void for the warning frame.
I think the problem is my try/catch. The sleep happens but the closing void takes place first?
Here are bits:
public void actionPerformed (ActionEvent close)
          if(close.getSource () == closeBtn)
               ExitVerify EV = new ExitVerify();
          if(close.getSource () == but[0])
                    Unavailable     msg = new Unavailable();
          try
                    Thread.sleep(4000);
                    msg.closeNotice();
               catch(InterruptedException e)
public void closeNotice()
          jf.dispose();
     }

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