Contoh Program FCFS(FIRST COME FIRST SERVED)

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