[JAVA/자바] 메모리 사용량 확인

Runtime.getRuntime().gc();
Long usedMemory = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
System.out.println(usedMemory + "B");
System.out.println(usedMemory / 1000 + "KB");
System.out.println(usedMemory / 1000 / 1000 + "MB");