Total amount of memory in Java virtual machine

import java.text.DecimalFormat;

public class Main {
  public static void main(String[] args) {
    DecimalFormat df = new DecimalFormat("0.00");

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

    System.out.println(df.format(totalMem / 1000000F) + " MB");

  }
}