system design interview questions and answers

Package com. Threadlearn.test; Import java.util.*; Import Java.util.concurrent.locks.ReadWriteLock; Import Java.util.concurrent.locks.ReentrantReadWriteLock; Interview questions, design a caching system; Use pseudocode to implement public class Cachedemo { //Storage object Container private map

Interview questions-java Design Pattern Example 1, adapter modeInvolves three roles: Target destination interface, Adaptee source role, adapter adapter,adapter The source interface to the target interface, inherits the source interface, and implements the target interface .Many examples of Java I/O operations are:InputStreamReader the inputstream to reader; you n

Design a method for java interview questions to obtain random numbers in any range. When learning java basics, you may listen to the random numbers between 1 and 100 at most, so we should first write a random number between 1 and 100. The Code is as follows, public class MathDemo1 { public static void main(String[] args) { for(int i=0;i In this l

data sent by the listener does not need to decrypt to see the content. How do you virtualize a Linux physical machine? Tell me some weird linux commands. Explains how HTTPS works. http://blog.csdn.net/sean_cd/article/details/6966130How HTTPS works Do you know Tor browser? Explain how it works. How do I trigger a forced system check the next time I start the machine? What backup technology do you like? Master-slave replication tape dri

I. Application of the factory model in development Interview Questions:Write a simple calculator. Code implementation: Abstract An operation class: Package COM. qianyan. calcuator; public abstract class operation {// number one private double num1; // number two private double num2; Public double getnum1 () {return num1;} public void setnum1 (double num1) {This. num1 = num1;} public double getnum2 () {return num2;} public void setnum2 (double num2)

. Synchronize the data between the main library and the library, and then repeat the action again13. Use a single command to turn off all services except SSHD, Crond, network, Rsyslog services (no power-on automatic)Method One:[[Email protected]~]# for name in ' Chkconfig–list|grep 3:on|awk ' {print '} ' |grep-ev "sshd|crond|rsyslog|network" ';d och Kconfig $name Off;done[Email protected]~]# chkconfig–list|grep 3:onCrond 0:off 1:off 2:on 3:on 4:on 5:on 6:offNetwork 0:off 1:off 2:on 3:on 4:on 5:o

the dispatch of the operating system. This is the design, greatly improve the CPU utilization, the process is to achieve multi-channel programming on the CPU proposed, the process is still a lot of defects, mainly embodied in two points: 1, the process can only do one thing at a time, if you want to do two things at once or many things, the process will be powerless. 2, if the process is blocked during exe

the same time, under the operation of the operating system, can be implemented concurrently. This is the design that greatly improves the CPU utilization, process is in order to achieve multi-channel programming on the CPU, the process is still a lot of defects, mainly reflected in two points: 1, the process can only do one thing at a time, if you want to do two or more things at the same time, the process

Microsoft Asia Technical Center interview questions !!!1. Differences between processes and threads.A thread is an execution unit in a process and a schedulable entity in the process.Differences from processes:(1) scheduling: A thread is the basic unit of scheduling and allocation, and a process is the basic unit of resource ownership.(2) concurrency: not only can concurrent execution be performed between p

as 2:32 below, indicates how long the system has been running since the last start.[[email protected] DOWNLOAD] #uptime02:05:22 up 2:32, 2 users, Load average:0.00, 0.00, 0.0014. How to add route in Linux systemHost routingRoute add-host 192.168.197.100 Dev eth0Gateway RoutingRoute add default GW 192.168.197.1Network routingRoute ad-net 192.168.1.0 netmask 255.255.255.0 deveth1Route ad-net 192.168.1.0 netmask 255.255.255.0 gw192.168.197.115. The cont

://www.baidu.com/s?wd=test on the specified server 61.135.169.121, and the time-out for the access is 20 seconds: Curl–connect-timeout Http://61.135.169.121/s?wd=test 9. With the netstat command with other shell commands, according to the source IP statistics all the established status links to 80 ports, the output is similar (the first column number of connections, the second column IP): [Email protected]~]# Netstat-an|grep establishedTCP 0 139.224.199.85:22 101.47.33.86:

. Therefore, A total of 12 traffic signals are generated in the system. The traffic lights at the right bend are evergreen, that is, they are always red. No matter where the program gets the lights in a certain direction, each time it gets the same instance object, it is very convenient for the Lamp class to use enumeration, there are always only instance objects that represent the lights in 12 directions. Design