使用 finalize() 清理活动；
Cleanup activities with finalize() ;
我读到了 finalize() 方法，这是垃圾收集器在释放内存之前调用的方法。
从文档中，finalize 用于进行清理活动。但是 "things" 在这个 "cleanup activities"
中清理了什么
摘自 Bruce Eckel 的“Java 中的思考”一书：
It would seem that finalize( ) is in place because of the possibility that you’ll do something
Clike by allocating memory using a mechanism other than the normal one in Java. This can
happen primarily through native methods, which are a way to call non-Java code from Java.
C and C++ are the only languages currently supported by
native methods, but since they can call subprograms in other languages, you can effectively
call anything. Inside the non-Java code, C’s malloc( ) family of functions might be called to
allocate storage, and unless you call free( ), that storage will not be released, causing a
memory leak. Of course, free( ) is a C and C++ function, so you’d need to call it in a native
method inside your finalize( ).
After reading this, you probably get the idea that you won’t use
finalize( ) much.
典型的清理类型是释放实例分配的任何系统资源，例如 FileInputStream.
情况下的文件描述符
请注意，好的 Java 程序永远不会依赖对象终结器中执行的清理，而是会明确要求对象在其使用到期时释放资源。
不幸的是，JDK 中有一些难看的示例，其中终结器是唯一提供的机制。一个臭名昭著的是 DirectByteBuffer，它分配本机（堆外）内存并且不提供 public 方法来释放它。
我读到了 finalize() 方法，这是垃圾收集器在释放内存之前调用的方法。 从文档中，finalize 用于进行清理活动。但是 "things" 在这个 "cleanup activities"
中清理了什么摘自 Bruce Eckel 的“Java 中的思考”一书：
It would seem that finalize( ) is in place because of the possibility that you’ll do something Clike by allocating memory using a mechanism other than the normal one in Java. This can happen primarily through native methods, which are a way to call non-Java code from Java. C and C++ are the only languages currently supported by native methods, but since they can call subprograms in other languages, you can effectively call anything. Inside the non-Java code, C’s malloc( ) family of functions might be called to allocate storage, and unless you call free( ), that storage will not be released, causing a memory leak. Of course, free( ) is a C and C++ function, so you’d need to call it in a native method inside your finalize( ).
After reading this, you probably get the idea that you won’t use finalize( ) much.
典型的清理类型是释放实例分配的任何系统资源，例如 FileInputStream.
请注意，好的 Java 程序永远不会依赖对象终结器中执行的清理，而是会明确要求对象在其使用到期时释放资源。
不幸的是，JDK 中有一些难看的示例，其中终结器是唯一提供的机制。一个臭名昭著的是 DirectByteBuffer，它分配本机（堆外）内存并且不提供 public 方法来释放它。