Reuters machine trial

Reuters's questions are quite detailed. One point, each layer is very careful. Next we will describe the unclear questions that I have encountered.

1: thread status

 
Thread thread = new thread (); State state = thread. getstate ();
 

The following statuses are available:

 
State. Blocked; State. waiting; State. timed_waiting; State. terminated; State. runnable; State. New;
 

2: serversocket class details

When serversocket is constructed with port 0, it means:

A port number of 0 means thatPort Number is automatically allocated,Typically from an ephemeral port range. This port number can then be retrieved by calling {@ link # getlocalport }.

The constructor has the following types:

Public serversocket () throws ioexceptionpublic serversocket (INT port, int backlog) throws ioexception public serversocket (INT port, int backlog, inetaddress bindaddr) throws ioexceptionthe backlog argument is the requested maximum number of pending connections on the socket.
 

3: Database permission operations

 
Grant usage, select, insert, update, delete on database_name.table_name to user_name @ localhost indentified by password
 

4: common ports

21 FTP

22 SSH

23 Telnet

25 SMTP

53 DNS

80 HTTP

443 HTTPS

The following problems should be solved:

1. What is the internal category function?
2. distributed system lock?
3. File serialization
5. View hard disk commands
6. view route table commands
7. Linux Weibo server software and FTP server software
8. view the IP addresses of all NICs.
9. CDN principles
10. Rsync startup