FIRST COME FIRST SERVED

FIRST COME FIRST SERVED

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Description : THIS IS A PROGRAM ON FIRST COME FIRST SERVED PROCESS SCHEDULING ALGORITHAM OF TYPE NONPREEMPTIVE SCHEDULING ALGORITHAM.THIS ALGORITHAM HELPS YOU TO ANALYSE THE FCFS CLEARLY AND AND ALSO CALCULATES SOME PARAMETERS WHICH ARE GOING TO BE MENTIONED .

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[2])
{
System.exit(0);
}
else if(ae.getSource() == jb[0])
{
FT[0] = Integer.parseInt(jt1[0].getText()) +
Integer.parseInt(jt2[0].getText());

for(int i=0;i<k;i++)
{
if(i==0)
{
WT[i] = 0;
}
else
{
if(FT[i-1] < Integer.parseInt(jt1[i].getText()))
{
FT[i] =
Integer.parseInt(jt1[i].getText())+Integer.parseInt(jt2[i].getText());
WT[i] = 0;
}
else
{
FT[i] = FT[i-1] + Integer.parseInt(jt2[i].getText());
WT[i] = FT[i-1] - Integer.parseInt(jt1[i].getText());
}

}
TAT[i] = WT[i]+Integer.parseInt(jt2[i].getText());
NTAT[i] = TAT[i]/(Integer.parseInt(jt2[i].getText()));
sum = sum+WT[i];

}//end for loop
for (int i=0;i<7;i++ )
{
jp.add(new JLabel(str1[i]));
}
for (int i=0;i<k;i++)
{
jp.add(new JLabel("process"+(i+1)));
jp.add(new JLabel(" "+Integer.parseInt(jt1[i].getText())));
jp.add(new JLabel(""+Integer.parseInt(jt2[i].getText())));
jp.add(new JLabel(""+WT[i]));
jp.add(new JLabel(""+FT[i]));
jp.add(new JLabel(""+TAT[i]));
jp.add(new JLabel(""+NTAT[i]));

}
avg = sum/k;
String str2 = "Average Waiting Time is "+ avg;
jp1.add(new JLabel(str2));
main.add(jp,BorderLayout.NORTH);
main.add(jp1,BorderLayout.SOUTH);

JOptionPane.showMessageDialog(null,main,"output",JOptionPane.PLAIN_MESSAGE
);

}
else 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