아이템 7. 다 쓴 객체 참조를 해제해라다 쓴 객체 참조를 해제하라JDK 8버전 코드public class Stack{ private Object[] elements; private int size = 0; private static final int DEFAULT_INITIAL_CAPACITY = 16; public Stack(){ elements = new Object [DEFAULT_INITIAL_CAPACITY]; } public void push(Object e){ ensureCapacity(); elements[size++] = e; } ..