java - Using an ArrayList to draw images (JPanel, JFrame) -

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i having trouble using arraylist draw multiple images within jpanel/jframe. project create yar's revenge type game. far, no near here have:

import java.awt.color; import java.awt.component; import java.awt.graphics; import java.awt.image; import java.awt.toolkit; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.awt.event.keyevent; import java.awt.event.keylistener; import java.awt.image.imageobserver; import java.util.arraylist; import javax.swing.jpanel;  public class gamepanel extends jpanel implements actionlistener, keylistener, imageobserver {         public image ship;         public image enemy;         public image shot;         private int xloc;         private int yloc = 180;         private int xloc2 = 700;         private int yloc2 = 180;         private int xvel;         private int yvel;         private int xvel_en;         private int xvel_sh;         private imageobserver observer;         private arraylist<base> shield = new arraylist<base>();         private image shieldpiece;          public gamepanel()  {             ship = toolkit.getdefaulttoolkit().createimage("ship3.png");             enemy = toolkit.getdefaulttoolkit().createimage("alien-ship-1.png");             shot = toolkit.getdefaulttoolkit().createimage("shot4.png");             shieldpiece = toolkit.getdefaulttoolkit().createimage("block1.png");              for(int x = 300; x < 420; x = x + 30)                 for(int y = 100; y < 220; y = y + 30)   {                     base temp = new base(x,y);                     shield.add(temp);                 }         }          public void paint(graphics g){             super.paint(g);             g.drawimage(ship, xloc, yloc, null);             //g.drawimage(enemy, xloc2, yloc2, null);              for(base b: shield)                 g.drawimage(shieldpiece, b.getshieldx(), b.getshieldy(), null);         }          @override         public void actionperformed(actionevent arg0) {             // todo auto-generated method stub              move();             setbackground(color.black);             repaint();          }          private void move() {              int endofwindow = getwidth();             int endofwindow1 = getheight();             if(xloc>=(endofwindow - ship.getwidth(null))|| xloc<0)                 xvel = -xvel;             xloc +=xvel;                 if(xloc>=(endofwindow - ship.getwidth(null)))                 xvel = -xvel;             xloc +=xvel;             if(yloc>=(endofwindow1 - ship.getheight(null)) || yloc<0)                 yvel = -yvel;             yloc +=yvel;             if(yloc>=(endofwindow1 - ship.getheight(null)))                 yvel = -yvel;             yloc +=yvel;          }          @override         public void keypressed(keyevent arg0) {             // todo auto-generated method stub              if(arg0.getkeycode() == keyevent.vk_d)                 xvel = 3;             if(arg0.getkeycode() == keyevent.vk_a)                 xvel = -3;             if(arg0.getkeycode() == keyevent.vk_w)                 yvel = -3;             if(arg0.getkeycode() == keyevent.vk_s)                 yvel = 3;              if(arg0.getkeycode() == keyevent.vk_right)                 xvel = 3;             if(arg0.getkeycode() == keyevent.vk_left)                 xvel = -3;             if(arg0.getkeycode() == keyevent.vk_up)                 yvel = -3;             if(arg0.getkeycode() == keyevent.vk_down)                 yvel = 3;              //if(arg0.getkeycode() == keyevent.vk_space)            }          @override         public void keyreleased(keyevent arg0) {             // todo auto-generated method stub              if(arg0.getkeycode() == keyevent.vk_d || arg0.getkeycode() == keyevent.vk_a)                 xvel = 0;             if(arg0.getkeycode() == keyevent.vk_w || arg0.getkeycode() == keyevent.vk_s)                 yvel = 0;              if(arg0.getkeycode() == keyevent.vk_right || arg0.getkeycode() == keyevent.vk_left)                 xvel = 0;             if(arg0.getkeycode() == keyevent.vk_up || arg0.getkeycode() == keyevent.vk_down)                 yvel = 0;          }          @override         public void keytyped(keyevent arg0) {             // todo auto-generated method stub          } }

and here base class:

import java.awt.image; import java.awt.toolkit;   public class base {     private image shieldpiece;     private int x;     private int y;      public base(int xcoord, int ycoord) {         xcoord = x;         ycoord = y;             }      public int getshieldx() {         return x;     }      public int getshieldy() {         return y;     }  }

gamewindow class reference:

import java.awt.color; import java.awt.event.keylistener; import javax.swing.jframe; import javax.swing.timer;  public class gamewindow extends jframe {      public gamewindow() {         setsize(800, 500);         gamepanel pan = new gamepanel();         timer t = new timer(40, pan);         add(pan);         this.addkeylistener(pan);         setdefaultcloseoperation(jframe.exit_on_close);         t.start();      }      /**      * @param args      */     public static void main(string[] args) {         // todo auto-generated method stub      }  }

annnnd pops up:

http://i.imgur.com/4bmf3ab.png

enter image description here

it should draw multiple shield pieces (the red rectangle) right of ship somewhere (starting @ x=300, y=100). window 800x500. i'm not sure why it's not looping through arraylist draw each piece. me?

the reason have found till this:

public base(int xcoord, int ycoord) {   xcoord = x;   ycoord = y; }

you assigning xcoord value of x , ycoord value of y 0 default.it should changed to:

public base(int xcoord, int ycoord) {  x = xcoord ;  y = ycoord ; }

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