Button to frame | button going back to the main frame (please help)

Question

these are the codes, by clicking the "FCFS" button it will generate another frame and from that frame another button will be pressed "accept" and it will go to another frame....
my problem is that i nid to put codes on the "back" button to go back to the main frame were it started... please help me... thnks
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Oscon extends JFrame
     private JButton fcfsB, priorityB, sjfB, rrB, exitB, creditsB;
     private fcfsButtonHandler fbHandler;
     private priorityButtonHandler pbHandler;
     private sjfButtonHandler sbHandler;
     private rrButtonHandler rbHandler;
     private exitButtonHandler ebHandler;
     private creditsButtonHandler cbHandler;     
     public Oscon()// main frame
          fcfsB = new JButton ("FCFS");
          fbHandler = new fcfsButtonHandler();
          fcfsB.addActionListener(fbHandler);
          priorityB = new JButton ("PRIORITY");
          pbHandler = new priorityButtonHandler();
          priorityB.addActionListener(pbHandler);
          sjfB = new JButton ("SJF");
          sbHandler = new sjfButtonHandler();
          sjfB.addActionListener(sbHandler);
          rrB = new JButton ("RR");
          rbHandler = new rrButtonHandler();
          rrB.addActionListener(rbHandler);
          exitB = new JButton ("EXIT");
          ebHandler = new exitButtonHandler();
          exitB.addActionListener(ebHandler);
          creditsB = new JButton ("CREDITS");
          cbHandler = new creditsButtonHandler();
          creditsB.addActionListener(cbHandler);
          setTitle("CPU SCHEDULING");
          Container pane =getContentPane ();     
          pane.setLayout(new GridLayout(2,3));
          pane.add(fcfsB);
          pane.add(priorityB);
          pane.add(sjfB);
          pane.add(rrB);
          pane.add(exitB);
          pane.add(creditsB);
          setSize(500,100);
          setVisible(true);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
     public class fcfsButtonHandler implements ActionListener
          public void actionPerformed(ActionEvent e)
               JFrame frame = new JFrame("FCFCS setting");
     final JLabel FCFSProcessL, FCFSp1L,FCFSp2L,FCFSp3L,FCFSp4L, FCFSbt;
          final JTextField FCFSp1TF,FCFSp2TF,FCFSp3TF,FCFSp4TF;
                    FCFSProcessL = new JLabel("PROCESS", SwingConstants.CENTER);
                    FCFSp1L     = new JLabel("P1:", SwingConstants.CENTER);
                    FCFSp2L     = new JLabel("P2:", SwingConstants.CENTER);
                    FCFSp3L     = new JLabel("P3:", SwingConstants.CENTER);
                    FCFSp4L     = new JLabel("P4:", SwingConstants.CENTER);
                    FCFSbt      = new JLabel("BT:", SwingConstants.CENTER);
                    FCFSp1TF= new JTextField (10);
                    FCFSp2TF= new JTextField (10);
                    FCFSp3TF= new JTextField (10);
                    FCFSp4TF= new JTextField (10);
                    JButton     FCFSokB = new JButton ("Accept");
                    FCFSokB.addActionListener(new ActionListener() {   
                    public void actionPerformed(ActionEvent e)
                              JFrame frame2 = new JFrame("FCFCS");
                              frame2.setSize(500,500);
                              frame2.setVisible(true);
                              frame2.setDefaultCloseOperation(EXIT_ON_CLOSE);
                              JButton     FCFSclearB = new JButton ("clear");
                              FCFSclearB.addActionListener(new ActionListener() {   
                              public void actionPerformed(ActionEvent e)
                              FCFSp1TF.setText("");
                              FCFSp2TF.setText("");
                              FCFSp3TF.setText("");
                              FCFSp4TF.setText("");
                    JButton     FCFSBackB = new JButton ("Back");
                    FCFSBackB.addActionListener(new ActionListener() {   
                    public void actionPerformed(ActionEvent e)
                              setTitle("CPU SCHEDULING");
                              frame.setLayout(new GridLayout(7,2));
                              frame.add(FCFSProcessL);
                              frame.add(FCFSbt);
                              frame.add(FCFSp1L);
                              frame.add(FCFSp1TF);
                              frame.add(FCFSp2L);
                              frame.add(FCFSp2TF);
                              frame.add(FCFSp3L);
                              frame.add(FCFSp3TF);
                              frame.add(FCFSp4L);
                              frame.add(FCFSp4TF);
                              frame.add(FCFSokB);
                              frame.add(FCFSclearB);
                              frame.add(FCFSBackB);
                              frame.setSize(200,250);
                              frame.setVisible(true);
                              frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
     public class priorityButtonHandler implements ActionListener
          public void actionPerformed(ActionEvent e)
     public class sjfButtonHandler implements ActionListener
          public void actionPerformed(ActionEvent e)
               System.exit (0);          
     public class rrButtonHandler implements ActionListener
          public void actionPerformed(ActionEvent e)
               System.exit (0);          
     public class exitButtonHandler implements ActionListener
          public void actionPerformed(ActionEvent e)
               System.exit (0);          
     public class creditsButtonHandler implements ActionListener
          public void actionPerformed(ActionEvent e)
               System.exit (0);          
          public static void main (String [] args)
          Oscon O = new Oscon();
}

Answer 1

please help me revise my program, im almost done, i just nid to set the progress bar that it will run according to the waiting time, or set the progress bar to run in order.. these are the variable names of the progress bar(current1, then current2, then current3 then current4).
i looked it up on the site and i cant really understand it... i just did the part where i included the progress bar to the interface. ijust want the 4 progress bars to run after clicking the accept button.... Please help me!!! its for my project and i didnt slept last night just working on this... i just nid help sir... thnks...
these are the codes i made:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JProgressBar;
public class CPUSched
          public CPUSched()
          JFrame frame = new JFrame();
               JProgressBar current1, current2, current3, current4;
               Thread runner;
               int num = 0;
          final JLabel ProcessL, p1L,p2L,p3L,p4L, bt, prioL, tqL, wtL, awtL, awtLA;
               final JTextField p1TF,p2TF,p3TF,p4TF, prio1TF, prio2TF,prio3TF,prio4TF, tqTF ;
               final JLabel      blank1, blank2, blank3, blank4, blank5, blank6, blank7, blank8, blank9, blank10, blank11,
                                   blank12, blank13, blank14, blank15;
               final JLabel     blank16, blank17, blank18, blank19, blank20, blank21, blank22, blank23, blank24, blank25,
                                   blank26, blank27, blank28, blank29, blank30;
               current1 = new JProgressBar(0, 2000);
               current1.setValue(0);
     current1.setStringPainted(true);
               current2 = new JProgressBar(0, 2000);
               current2.setValue(0);
     current2.setStringPainted(true);
               current3= new JProgressBar(0, 2000);
               current3.setValue(0);
     current3.setStringPainted(true);
               current4 = new JProgressBar(0, 2000);
               current4.setValue(0);
     current4.setStringPainted(true);
                    ProcessL = new JLabel("PROCESS", SwingConstants.CENTER);
                    p1L     = new JLabel("P1:", SwingConstants.CENTER);
                    p2L     = new JLabel("P2:", SwingConstants.CENTER);
                    p3L     = new JLabel("P3:", SwingConstants.CENTER);
                    p4L     = new JLabel("P4:", SwingConstants.CENTER);
                    bt      = new JLabel("Burst Time:", SwingConstants.CENTER);
                    prioL= new JLabel("Priority (1-4):", SwingConstants.CENTER);
                    tqL= new JLabel("Time Quantum:", SwingConstants.CENTER);
                    wtL= new JLabel("Waiting time:", SwingConstants.CENTER);
                    awtL= new JLabel("Average Waiting time:");
                    awtLA= new JLabel("");
                    blank1= new JLabel("");
                    blank2= new JLabel("");
                    blank3= new JLabel("" ,SwingConstants.CENTER);
                    blank4= new JLabel("");
                    blank5= new JLabel("", SwingConstants.CENTER);
                    blank6= new JLabel("");
                    blank7= new JLabel("");
                    blank8= new JLabel("" ,SwingConstants.CENTER);
                    blank9= new JLabel("");
                    blank10= new JLabel("");
                    blank11= new JLabel("", SwingConstants.CENTER);
                    blank12= new JLabel("");
                    blank13= new JLabel("");
                    blank14= new JLabel("");
                    blank15= new JLabel("");
                    blank16= new JLabel("");
                    blank17= new JLabel("");
                    blank18= new JLabel("");
                    blank19= new JLabel("");
                    blank20= new JLabel("");
                    blank21= new JLabel("");
                    blank22= new JLabel("");
                    blank23= new JLabel("");
                    blank24= new JLabel("");
                    blank25= new JLabel("");
                    blank26= new JLabel("");
                    blank27= new JLabel("");
                    blank28= new JLabel("");
                    blank29= new JLabel("");
                    blank30= new JLabel("");
                    p1TF= new JTextField (2);
                    p2TF= new JTextField (2);
                    p3TF= new JTextField (2);
                    p4TF= new JTextField (2);
                    prio1TF= new JTextField (2);
                    prio2TF= new JTextField (2);
                    prio3TF= new JTextField (2);
                    prio4TF= new JTextField (2);
                    tqTF= new JTextField (2);
                         prio1TF.setEditable(false);
                         prio2TF.setEditable(false);
                         prio3TF.setEditable(false);
                         prio4TF.setEditable(false);
                         tqTF.setEditable(false);
                    JButton     okB = new JButton ("Accept");
                    okB.addActionListener(new ActionListener() {   
                    public void actionPerformed(ActionEvent e)
                         double iw=0, wtp1, wtp2, wtp3, wtp4;
                         double bt1, bt2, bt3, bt4;
                         double averageWT, sumWT;
                         bt1=Double.parseDouble(p1TF.getText());
                         bt2=Double.parseDouble(p2TF.getText());
                         bt3=Double.parseDouble(p3TF.getText());
                         bt4=Double.parseDouble(p4TF.getText());
                         wtp1 = iw;
                         wtp2 = wtp1+bt1;
                         wtp3 = wtp2+bt2;
                         wtp4 = wtp3+bt3;
                         sumWT = wtp1+wtp2+wtp3+wtp4;
                         averageWT = sumWT/4;
                         awtLA.setText(""+averageWT);
                         blank3.setText(""+wtp1);
                         blank5.setText(""+wtp2);
                         blank8.setText(""+wtp3);
                         blank11.setText(""+wtp4);
                    JButton     clearB = new JButton ("Clear");
                    clearB.addActionListener(new ActionListener() {   
                    public void actionPerformed(ActionEvent e)
                              p1TF.setText("");
                              p2TF.setText("");
                              p3TF.setText("");
                              p4TF.setText("");
                         awtLA.setText("");
                         blank3.setText("");
                         blank5.setText("");
                         blank8.setText("");
                         blank11.setText("");
                         frame.setTitle("First Come First Serve");
                              frame.setLayout(new GridLayout(6,6));
                              frame.add(ProcessL);
                              frame.add(blank1);
                              frame.add(wtL);
                              frame.add(bt);
                              frame.add(prioL);
                              frame.add(tqL);
                              frame.add(p1L);
                              frame.add(current1);
                              frame.add(blank3);                              
                              frame.add(p1TF);
                              frame.add(prio1TF);
                              frame.add(tqTF);
                              frame.add(p2L);
                              frame.add(current2);
                              frame.add(blank5);
                              frame.add(p2TF);
                              frame.add(prio2TF);
                              frame.add(blank6);
                              frame.add(p3L);
                              frame.add(current3);
                              frame.add(blank8);
                              frame.add(p3TF);
                              frame.add(prio3TF);
                              frame.add(blank9);
                              frame.add(p4L);
                              frame.add(current4);
                              frame.add(blank11);
                              frame.add(p4TF);
                              frame.add(prio4TF);
                              frame.add(blank12);
                              frame.add(blank13);
                              frame.add(blank14);
                              frame.add(okB);
                              frame.add(clearB);
                              frame.add(awtL);
                              frame.add(awtLA);
                              frame.setSize(800,200);
                              frame.setVisible(true);
                              frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public static void main (String [] args)
          CPUSched O = new CPUSched();
}