Calendar.getInstance()ループに入れないでOutOfMemoryError:Java heap space

Calendar.getInstance()ループに入れないでOutOfMemoryError:Java heap space

  List<Calendar> l = new ArrayList<Calendar>(); 
       while (true) {         
   l.add(Calendar.getInstance()); 
           System.out.println(l.size());   
     }           
  605473   
     Exception in thread "main" java.lang.OutOfMemoryError: Java heap space   
         at java.util.Calendar.<init>(Unknown Source) 
           at java.util.GregorianCalendar.<init>(Unknown Source)
            at java.util.Calendar.createCalendar(Unknown Source)
            at java.util.Calendar.getInstance(Unknown Source)
            at jodatestmemory.Main.main(Main.java:25)