Snake Game in Java

engerek.class is to creat snake and update position of snake

import java.util.ArrayList;
import javax.swing.*;
import java.awt.Image;
//import java.math.*;
public class engerek extends variables{

//inner class
 protected class ekans{
 private double x;
 private double y;
 private Image head;
 //default constructor
 public ekans(){
  this.head = kelle;
  this.x = 0.0;
  this.y = 0.0;
 }
 //constructor
 public ekans(Image i,double a,double b){
  this.head = i;
  this.x = a;
  this.y = b;
 }
 public Image gethead(){
  return head;
 }
 public int getx(){
  return (int)x;}
 public int gety(){
  return (int)y;}
 public void setxy(double x,double y){
  this.x = x;
  this.y = y;
 }
 }
 protected Image askelle = new ImageIcon("C:\\Users\\engerek\\images\\aw.png").getImage();//to load Snake head image
 protected Image kelle = new ImageIcon("C:\\Users\\engerek\\images\\ae.png").getImage();//to Load Snake image
 protected Image wall = new ImageIcon("C:\\Users\\engerek\\images\\ay.png").getImage(); //to Load WALL image
 protected Image yem = new ImageIcon("C:\\Users\\engerek\\images\\as.png").getImage();//to Load Seed image 
 ArrayList<ekans> coord = new ArrayList<ekans>();
 ArrayList<ekans> food = new ArrayList<ekans>();
 public void addtile(Image i,int coorx,int coory){
  coord.add(0,new ekans(i,coorx,coory));
 }
 
 public void start(){
  addtile(kelle,320,300);
  addtile(kelle,300,300);
  addtile(kelle,280,300);
  addtile(kelle,260,300);
  addtile(kelle,240,300);
  addtile(kelle,220,300);
  food.add(new ekans(yem,300,400));
  food.add(new ekans(askelle,500,500));
  food.add(new ekans(yem,440,440));
  food.add(new ekans(askelle,100,100));
 }
 public Image load(Image i){
  i = new ImageIcon("C:\\javapics\\deadly.png").getImage();
     return i;
 }
 public void seedupdate(){
  double xco,yco;
  boolean tamamdir = false;
  while(tamamdir==false){
  xco = Math.random()*20;
  yco = Math.random()*20;
  xco = 20 + Math.round(xco)*40;
  yco = 20 + Math.round(yco)*40;
  for(int i = 0;i<coord.size();i++)
   if(xco!=coord.get(i).x && yco != coord.get(i).y){
    if(xco<760 && yco<560 )
    if(yco>20 && xco>20){
     if(index%2==1){
      food.remove(index);
      food.add(index,new ekans(yem,xco,yco));
     }else{
      food.remove(index);
      food.add(index,new ekans(askelle,xco,yco));
     }
    tamamdir = true;
    }
   }
  }
 }
 public void snakeupdate(){
  ekans e = coord.get(0); //ekans object is pointed first element of arraylist
  ekans newmove = new ekans();
  yon = sonrakiyon;
  switch(yon){
  case kuzey :
   newmove.x = e.x;
   newmove.y = e.y - 20.0;
   break;
  case guney : 
   newmove.x = e.x;
   newmove.y = e.y + 20.0;
   break;
  case bati :
   newmove.x = e.x - 20.0;
   newmove.y = e.y;
   break;
  case dogu :
   newmove.x = e.x + 20.0;
   newmove.y = e.y;
   break;
  }
  
  //collision of snake with walls
  if(newmove.x<20){
   lost = true;
   return;
  }if(newmove.x>780){
   lost = true;
   return;
  }if(newmove.y<20){
   lost = true;
   return;
  }if(newmove.y>560){
   lost = true;
   return;
  }
  //collision of snake with itself
  for(int i=0;i<coord.size();i++){
   if(newmove.x == coord.get(i).x && newmove.y == coord.get(i).y){
    lost = true;
    break;
   }
  }
  //eating seed and growing up
  for(int i = 0;i<food.size();i++)
  if(newmove.x==food.get(i).getx() && newmove.y == food.get(i).gety()){
  growup = true;
  score += 5;
  index = i;
  break;
  }
  if(growup==true){
  coord.add(0,newmove);
  }else{
   coord.add(0,newmove);
   coord.remove(coord.size()-1);
  }
   
 }
 //if collision is occur then snake starts up again
 public void collision(){
  coord.removeAll(coord);
  start();
  score = 0;
  dead++;
  lost = false;
  sonrakiyon = kuzey;
 }
}