网人信息发布系统(WRMPS) 2008 SP2 build 0718
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因为这几个版本主要以系统的运行稳定着想， 所以在功能方面并没什么大的改进，主要是对系统的优化，及一些BUG或者不太人性化的地方修改，此次版本在速度上较上版本有了50%左右的提升。WRMPS 2008 SP2 升级功能说明1，新增伪静态功能2，新增全屏分类广告功能3，新增地区分站代理功能！4，新增分站独立顶级域名支持5，新增友情连接支持分城市功能6，新增支持百度新闻规范7，新增自由设置关键词及网页
The string is immutable means that we cannot change the object itself, but we can change the reference to the object. The string is made final to not allow others to extend it and destroy its immutability.
- Security Parameters are typically represented as String in network connections, database connection URLs, usernames/passwords, etc. If it was mutable, these parameters could be changed easily.
- Synchronization and Concurrency making String immutable automatically makes them thread safe thereby solving the synchronization issues.
- Caching when compiler optimizes our String objects, it seems that if two objects have the same value (a =" test", and b =" test") and thus we need only one string object (for both a and b, these two will point to the same object).
- Class loading String is used as arguments for class loading. If mutable, it could result in the wrong class being loaded (because mutable objects change their state).
Example:
public class StringImmutableDemo {
public static void main(String[] args) {
String st1 = "Tutorials";
String st2 = "Point";
System.out.println("The hascode of st1 = " + st1.hashCode());
System.out.println("The hascode of st2 = " + st2.hashCode());
st1 = st1 + st2;
System.out.println("The Hashcode after st1 is changed : "+ st1.hashCode());
}
}输出：
The hascode of st1 = -594386763 The hascode of st2 = 77292912 The Hashcode after st1 is changed : 962735579
