🚀 go-pugleaf

class Book {
  boolean checkedOut = false;
  Book(boolean checkOut) {
    checkedOut = checkOut;
  }
  void checkIn() {
    checkedOut = false;
  }
  public void finalize() {
    if(checkedOut)
      System.out.println("Error: checked out");
  }
}
public class DeathCondition {
  public static void main(String[] args) {
    Book novel = new Book(true);
    novel.checkIn();
    new Book(true);
    System.gc();
  }
}
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��   novel.checkIn();
new Book(true);��ȥ�����Ͳ�����ʾ�ˣ�����Ϊʲô����û���Ǹ�reference�������
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