java小心机(3)| 浅析finalize()

public class Book {
    public boolean checkedOut = false;

    public Book(boolean checkedOut) {
        this.checkedOut = checkedOut;
    }

    public void checkIn() {
        checkedOut = false;
    }

    //重写finalize方法 \
    @Override
    protected void finalize() throws Throwable {
        //校验checkedOut
        if (checkedOut) {
            System.out.println("校验出现了一次错误: Checked out ");
        }
       super.finalize();
    }
}

public class TerminationCondition {
    public static void main(String[] args) {

        Book novel = new Book(true);
        novel.checkIn();

        //对checked进行了一次误操作,未进行签入
        new Book(true);

        //调用Gc 强制执行终结操作(finalize)
        System.gc();
    }
}