This chapter concerns creating and destorying objects : when and how to create them, when and how to avoid creating them, how to ensure they are destoryed in a timely manner, how to manage any cleanup actions that must precede their destruction....
Creating and Destroying Objects1, Consider providing static factory methods instead of constructorsPros:NamedmethodsFlexible: not required to create a new object each time invoked.Flexible: can provide an object ofany subtype.ConsThe class without a public or protected constructor cannot be subclassed....
- Improve performance e.g.Boolean.valueOf(boolean b) 4. Static factory method can return any subtype of their return type - an API can return objects without making their classes public (can only make the interface public) 5. Static factory method can help guess type parameter e.g. Map<S...
Item 4 Enforce noninstantiability with a private constructor. Item 5 Avoid creating unnecessary objects. Item 5 中第一版的duplicate objects变成了unnecessary objects,这个虽然是一个很细小的变动,但是味道十足,慢慢品之。 Item 6 Eliminate obsolete object references. Item 7 Avoid finalizers....
Java expert Josh Bloch discusses creating and destroying objects: when and how to create them, when and how to avoid creating them, how to ensure they are destroyed in a timely manner, and how to manage any cleanup actions that must precede their destruction. This chapter is from the book ...
Creating and Destroying Java Objects: Part 1Joshua Bloch
Creating and Destroying Java Objects: Part 2Dr. Dobb's JournalDr Dobbs Journal
JavaBeanspattern, call a parameterless constructor to create the object and then call setter methods to set each required parameter. A JavaBean may be in an inconsistent state partway through its construction【每次set都改变object的状态】. And the JavaBeans pattern precludes the possibility of making...
Creating and Destroying Contexts (Java Enterprise in a Nutshell)David FlanaganJim FarleyOreilly & Associates Inc
003 为多个对象使用SpReSeGET(003 Using a Spritesheet for Multiple Objects) 004 移动桨重新使用代码(004 Moving The Paddle - Re-Using Code) 005 移动Ball(005 Moving The Ball) 006 开始游戏(006 Starting The Game) 007 破坏砖(007 Destroying Bricks) 008 重置Ball(008 Resetting The Ball) 06 项目2 ...