entry level java developer

, one will succeed, others will fail, so also expand.Then the expansion process. First, change the state value of the object lock flag and point the pointer saved in Mark Word to the mutex lock (of course, the content of Mark Word is still not lost) I'm looking at a deep understanding of the Java Virtual Machine book, plus some blogs on the web. I didn't make this part clear, this place i " guess ": Invoke an operating system mutex, generate a mutex,

String getipaddr (HttpServletRequest request) { String IP = request.getheader ("X-forwarded-for"); if (IP = = NULL | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP)) { ip = Request.getheader ("Proxy-client-ip"); } if (IP = = NULL | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP)) { ip = Request.getheader ("Wl-proxy-client-ip"); } if (IP = = NULL | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP)) { ip = request.getremoteaddr (); } return IP;

Today, in the interview of the Gathering times, I say I have hashmap myself on my own understanding. After describing my own realization idea, the interviewer asks "HashMap" if the array is less efficient than the red-black tree? I was all at once. It is inefficient to use arrays, but it is true that JDK uses array + linked lists to store entities when compared to the source of the JDK.Back, hurriedly looked at the source code, also compared to the JDK6 and JDK 8 hashmap, found something not qui

InstrumentationThis class provides the services required to detect code in the Java programming language. Detection is the addition of bytecode to the method to collect data used by various tools. Because the changes are completely added, these tools do not modify the state or behavior of the application. Examples of this harmless tool include mirror proxies, parsers, overlay analyzers, and event loggers.http://www.iteye.com/problems/31779http://www.j

server accesses HTTP/ 192.168.1.110:2046/INDEX.JSP, the proxy server will return the results of the access to our browser, because it is the proxy server to access the index.jsp, so index.jsp through The Request.getremoteaddr () method gets the IP address of the proxy server, which is actually the address of the client.So we can get the real IP address of the client method one: publi Cif ==nullreturnreturn } When I visit http://www.5a520.cn/index.jsp/, however, the IP address r

". Equalsignorecase (ipAddress)) {ipAddress= Request.getheader ("Proxy-client-ip"); } if(IpAddress = =NULL|| Ipaddress.length () = = 0 | | "Unknown". Equalsignorecase (ipAddress)) {ipAddress= Request.getheader ("Wl-proxy-client-ip"); } if(IpAddress = =NULL|| Ipaddress.length () = = 0 | | "Unknown". Equalsignorecase (ipAddress)) {ipAddress=request.getremoteaddr (); if(Ipaddress.equals ("127.0.0.1") | | ipaddress.equals ("0:0:0:0:0:0:0:1"))){ //IP based on

All say that programmers pay a high salary, as a Java developer programmer, get 20,000 of the salary, what technology needs, the new programmer how to achieve a monthly salary of 20,000. In general, Java programmers with a monthly salary of 20,000 belong to intermediate programmers. It's just that the technology is a little bit better, and it's not the architect