java - NullPointerException Error on an Image -

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i'm working in java , wanted create arraylist of bufferedimages:

arraylist<bufferedimage> anotelist = new arraylist<bufferedimage>();

i want populate arraylist 197 bufferedimages in constructor of drawpanel class.

public drawpanel(){      for(int = 0; < 197; i++){         try {             anotelist.add(imageio.read(new file("a.png")));         } catch (ioexception e) {             e.printstacktrace();         }     }     setpreferredsize(new dimension(400, 600));     panelsize=getpreferredsize();     height=(int) panelsize.getheight();     width=(int) panelsize.getwidth();     system.out.printf("%d, %d\n",height,width);     loadimage();         }

then, in drawframe class, create object out of drawpanel class called canvas. use canvas here.

/*this checks see if song @ specified time , calls fall method in drawpanel class.*/  public void checkiffall() throws ioexception{     if(song.gettime() / 1000000000 == (jojo.getaarray()[canvas.getai()] /1000000000)){             //system.out.println("a fall");             canvas.fall(canvas.getanotelist().get(canvas.getai() + 1), canvas.getloca());             canvas.setai(canvas.getai()+1);     } }

i suspect real issues lie fall method, don't know why.

public void fall(bufferedimage img, location loc) throws ioexception{     if(img != null){     if(img == imageio.read(new file("a.png")))         x = 10;     if(img == imageio.read(new file("s.png")))         x = (width-s.getwidth())/2;     if(img == imageio.read(new file("d.png")))         x = width-d.getwidth()-20;     if(loc.gety()<=height){         system.out.println(img);         //offgc.drawimage(img, x, loc.gety(), null);         validate();         repaint();         makemove(movepixel(), loc);     }     } }

i'm getting nullpointerexception when pass image drawimage method, don't know why. array populated, said image wasn't null. what's wrong?! when print out image, got this:

bufferedimage@614c5515: type = 6 colormodel: #pixelbits = 32 numcomponents = 4 color space = java.awt.color.icc_colorspace@1e67b872 transparency = 3 has alpha = true isalphapre = false byteinterleavedraster: width = 50 height = 50 #numdataelements 4 dataoff[0] = 3

does mean anything?

as image not null, can graphics object offgc or loc object call gety() on. try printing out 2 see if null. including full stack trace helpful.


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