I am making a Java program. It involves making a image with size up to 9933 * 14043 pixels (which is A0 size and 300 ppi). The image is 24 bit, so it would take up about 400mb of space. The BufferedImage class some how take more RAM than the bitmap's actual size, so the image would comsume about 600 mb of RAM. With other data, the app would at max take about 700 mb of ram when rendering the large image. I haven't had any problem with it so far. However, if the end user doesn't have enough free ram, the JVM will not be able to allocate the memory for the bitmap and will throw an OutOfMemoryError.
So what should I do?
I came up with something:
I doubt that anyone has less than a gig of ram nowadays. So you can check if the user has enough memory with Runtime.getRuntime().maxMemory()
, and if they don't just show an error and close. Here's an example that uses JOptionPane
in the case of an error:
long memory = Runtime.getRuntime().maxMemory(); //in bytes
long required = 700 * 1024 * 1024; //700MB, in bytes
if(memory < required) {
JOptionPane.showMessageDialog(null, "You don't have enough memory. (700MB required)", "Error", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
maxMemory()
returns the maximum amount of memory the JVM will attempt to use (in bytes).
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