자신 메모리 보는 코드

package snippet;

public class Snippet {

 public static void main (String[] args) {

   double[] n1 = new double[1000000];

   double[] n2 = new double[1000000];

   long free  = Runtime.getRuntime().freeMemory();

   long total = Runtime.getRuntime().totalMemory();

   long max   = Runtime.getRuntime().maxMemory();

   System.out.format("Total Memory : %6.2f MB%n", (double) total / (1024 * 1024));

   System.out.format("Free  Memory : %6.2f MB%n", (double) free  / (1024 * 1024));

   System.out.format("Max   Memory : %6.2f MB%n", (double) max   / (1024 * 1024));

 }

}