Question

Sorry for such simple questions but I am new in Java
(usualy write in c)

do new in loop delete old instance of an object?

I need something like

   for(;;)
   {

     // work on here pixels[] 

     source = new MemoryImageSource(200, 200, pixels, 0, 50);
     image  = createImage(source;

    // then use image here

   }

I just need to get here above, new wraping of source and image objects
in every frame, and do not want to bother of deleting it,
But also I do not want to store large amounts of them as a memory leak,
Will it be deleted automatically? Is it heavy operation?

Answer 1

Yes, objects that are no longer being referenced will be garbage collected automatically (at an unspecified point in the future).

I would recommend moving the declaration of source and image into the loop:

for(;;) {
  ...
  Source source = new MemoryImageSource(200, 200, pixels, 0, 50);
  Image image  = createImage(source);
  ...
}

Not only this is preferable stylistically, it also avoids keeping the last iteration’s objects around for longer than necessary.