|
GC,or Garbage Collection is an intresting things. It help developers to deal with useless Object. When We use C++, we need to think about the deconstruction method to ensure the memory not lost. But with Java, it seems the JVM will do all things for us. Does it mean we need not to think about memory problem? Of cource, not. Although one of my teachers told us not to try to chanllenge GC, it is better than human do. These days i am join a project with two fellows. It is about a search engine component. When we search pages, we built a tree as a structure. At first, so careless we are. as a result, little waste for each page cause a large waste for all site, at last JVM throw a OutOfMemory Exception. Gradually, we make some change, then it is better, but still throw a OutOfMemory after a longer period. We need to think over everywhere to avoid the memory waste. we need to under stand how JVM works, and make garbage easy to be collected. For more detail and deep explore, you can try to see some Real Time Java book. Here, I just share some experience with you. 1. you can use java -verbose:gc [CLASSNAME] to observe the GC status.
2. temp Object in one function is easier to be collected
3. Object with less reference is easier to be collected
4. don''''t new a object you will not use for now
5. iterative method save more memory than recursion.But recursion seems more clearly. Decided by you.
6. A complex structrue is difficult for collect
7. System.gc() and fianlize() is useless for speed the process of GC
8. use static to share same object or use reference to share same object
9. you can use java -Xmx?m [CLASSNAME] to give JVM ? M memory to run programe. for instance, java -Xmx4m ShuJIP.HelloWorld
10. when you needn'''' to use one object,make it to null.maybe it is helpful for GC to recogonize it. in a word, we haven''''t method to destroy useless object,it will be done by JVM, but you need to think more about the method of process. You programe will be effective
[办公软件]PowerPoint模板使用经验之谈 [办公软件]教你在Powerpoint中设置页眉页脚
[办公软件]在Powerpoint中如何插入Flash动画 [办公软件]如何在Powerpoint 中(实现)输入上标、下标
[办公软件]如何在PowerPoint同一张幻灯片中显示大量文字 [办公软件]这样来修改PowerPoint超级链接的文字颜色
[办公软件]PowerPoint小小操作技巧，让您工作更轻松 [办公软件]如何在office(PowerPoint,Word,Excel)中制作带圈的…
[办公软件]保留PowerPoint超链接,但是取消超链接的下划线 [办公软件]挖掘PowerPoint图片自动压缩功能在不失真的情况下…
|
注：本站部分文章源于互联网，版权归原作者所有！如有侵权，请原作者与本站联系，本站将立即删除！ 本站文章除特别注明外均可转载，但需注明出处！ [MinTao学以致用网] 
