How do you do fcfs program in easy method using java?

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class fcfs extends JFrame implements ActionListener

{

JButton jb[] = new JButton[3];

JTextField jt1[],jt2[];

JLabel jl[],jl1,jl2,jl3;

JPanel jp,jp1;

Container con;

int k,p;

String str[] = {"SUBMIT","RESET","EXIT"};

String str1[] = {"Process"," AT","ST","WT","FT","TAT","NTAT"};

public fcfs()

{

super("fcfs scheduling algoritham");

con = getContentPane();

k= Integer.parseInt(JOptionPane.showInputDialog("Enter number of

process"));

jl1 = new JLabel("Process");

jl2 = new JLabel("Arival Time");

jl3 = new JLabel("Service Time");

jl = new JLabel[k];

jt1 = new JTextField[k];

jt2 = new JTextField[k];

for(int i=0;i<k;i++)

{

jl[i] = new JLabel("process"+(i+1));

jt1[i] = new JTextField(10);

jt2[i] = new JTextField(10);

}

for(int i=0;i<3;i++)

{

jb[i] = new JButton(str[i]);

}

con.setLayout(new GridLayout(k+2,3));

con.add(jl1);

con.add(jl2);

con.add(jl3);

int l=0;

for(int i=0;i<k;i++)

{

con.add(jl[l]);

con.add(jt1[l]);

con.add(jt2[l]);

l++;

}

l=0;

for(int i=0;i<3;i++)

{

con.add(jb[l]);

jb[l].addActionListener(this);

l++;

}

}//end of constructor

public void actionPerformed(ActionEvent ae)

{

int FT[] = new int[k];

int WT[] = new int[k];

int TAT[] = new int[k];

float NTAT[] = new float[k];

float sum=0;

float avg;

JPanel main = new JPanel();

main.setLayout(new BorderLayout());

jp = new JPanel();

jp1 = new JPanel();

jp.setLayout(new GridLayout(k+1,7));

jp1.setLayout(new FlowLayout());

if(ae.getSource() jb[1])

{

setVisible(false);

fcfs window = new fcfs();

window.setSize(400,300);

window.setVisible(true);

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}//END ACTION PERFORMED

public static void main(String[] args)

{

fcfs window = new fcfs();

window.setSize(400,300);

window.setVisible(true);

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}//end main

}//end class