import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

class ciara{
   private int x1;
   private int y1;
   private int x2;
   private int y2;

   public ciara(int X1, int Y1, int X2, int Y2){
      x1 = X1;
      y1 = Y1;
      x2 = X2;
      y2 = Y2;
   }

   public void nakreli(Graphics g){
      g.drawLine(x1, y1, x2, y2);
   }


}

class platno extends Canvas{
   private ArrayList<ciara> lines = new ArrayList <ciara>();
   private long pocet = 0;

   public void pridajCiaru(int X1, int Y1, int X2, int Y2){
      ciara l = new ciara(X1, Y1, X2, Y2);
      lines.add(l);
   }

    @Override
   public void paint(Graphics g){
      for(ciara l: lines)
         l.nakreli(g);
   }
}



public class zadanie1 {


private void readSubor(){
    FileInputStream subor = null;
try{
    subor = new FileInputStream("lines.txt");
    BufferedReader zoSuboru = new BufferedReader(new InputStreamReader(subor));

    int pocetCiar = Integer.parseInt(zoSuboru.readLine());

    int[] vektor = new int[pocetCiar*4];

    for (int i=0; i<(pocetCiar*4); i++)
    vektor[i] = Integer.parseInt(zoSuboru.readLine());

    zoSuboru.close();
   }
catch(Exception e){
    System.out.println("Nemozem nacitat zo suboru.");
   }
}

   public static void main(String[] args) throws FileNotFoundException {



      Frame f = new Frame();
      platno p = new platno();
      f.setSize(800, 600);
      f.add("Center", p);
      p.pridajCiaru(30, 30, 100, 100);
      //p.pridajCiaru(vektor[1], vektor[2], vektor[3], vektor[4]);
      f.addWindowListener(new WindowAdapter(){
            @Override
      public void windowClosing(WindowEvent we){
        System.exit(0);
      }});
      f.setVisible(true);
   }

}