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Copyright NOTICE: This article for Bo Master original article, reproduced please indicate the source, Welcome to exchange Study!At work, the string class is an object type that we use very frequently. In order to improve performance and reduce memory overhead, the JVM avoids duplicate string creation and maintains a special memory space, which is the core of our discussion today, the string pool. String pooling is maintained by the string class private.We know that there are two ways to create a

remote user to 3 [H3C] local-user aaa [H3C-luser-aaa] pa [H3C-luser-aaa] password si The [H3C-luser-aaa] password simple aaa [H3C-luser-aaa] ser [H3C-luser-aaa] service-

archives.After this operation, 1,201 kB of additional disk space will be used.Do you want to continue [Y/n]? 2. Configure msmtp and mutt 2.1 configure msmtpCreate the msmtp log File ". msmtp. log" and specify it in. msmtprc. Note that "." indicates a hidden file and the content is empty. $ sudo vim ~/.msmtp.log Configure the msmtp Configuration File ". msmtprc" #Accounts will inherit settings from this sectiondefaults# A first gmail addressaccount gmailhost smtp.gmail.comport

located in a type of file system that are typically found in the configuration file/etc/fstab, which contains information about the file system in the system.-mount does not cross the file system mount point when locating files.-follow If the find command encounters a symbolic link file, it tracks to the file that the link points to.1. Find/directory files starting with a[Email protected] ~]# Find/-name a.*/a.txt[Email protected] ~]#2. Find files with file permissions of 644 in the current di

String class:1. for the Equality judgment of a string object, use the Equals () method instead of = =. The Equals () of string determines whether the current string is consistent with the contents of the passed-in string.2. string is a constant, and its object cannot be changed once it has been created. When using the + stitching string, a new string object is generated instead of appending content to the original string object.3. string pool is in stack memory.4. String s = "

operations are sent to the currently available writehost. 0 "　　writetype= "0" dbtype= "MySQL" dbdriver= "native" switchtype= "2" slavethreshold= ">"show slave status3 Basic SQL Operation validationLook directly at the insert operation of the log, the current data is directly into the 3306 port of the host.01/17 10:53:58.596 DEBUG [$_NIOREACTOR-1-RW] (serverqueryhandler.java:56)-serverconnection [Id=1, Schema=TESTDB, host =0:0:0:0:0:0:0:1, User=test,txisolation=3, Autocommit=true, Schema=testdb]

": "222"} {ToJSON is the same as ToString, but should use ToString instead of ToJSON if possible, because ToJSON is also calling ToString and reallocating memory}J.free; EndTjsonarray procedure Tform1.button2click (sender:tobject); var A:tjsonarray; Begin A: = Tjsonarray.create; A.add (1); Tjsonarray is not like a traditional array, it can accept several different types of values, which should be considered as an extension of the Delphi array function. A.add (2); A.add ('

=2et:Usage:1. Vim test.pp$aaa =['/aaa/bbb/ccc/ddd ', 2] $bbb =path_to_array ($aaa [0]) $CCC =path_to_array ($aaa [0], $aaa [1]) notify{' result_$bbb ': message = [$BBB]}notify{' RESULT_$CCC ': message = [$CCC]}2, puppet apply TEST.PPnotice:compiled Catalog for puppet.mos.com

match multiple times {N ,}? Lazy match N-multiple times {M, n }? Lazy Match m-N times Quantifiers: Posite Word Table: Syntax Description ? + Occupy matching 0-1 times ++ Possession Matching 1-multiple times * + Possession matches 0-multiple times {N} + Possession matching multiple times {N ,}+ Possession match N-multiple times {M, n} + Occupy M-N times Ex

has been created. When you use the + sign to stitch a string, a new string object is automatically generated instead of appending content to the original string object.7.String Pool (string pooling):8.String s = "AAA";1) Look for the "AAA" object in the string pool, if it does not exist, create an "AAA" object in the string pool, and then return the address of t

Don't understand the data structure bitter AH The Union occupies only one memory space in memory, the size of which is determined by the largest data type in the Union, and when the Union is initialized, the value of the Union is determined by the last valid parameter ' Created on 2012-9-9 @author: Jincheng ' ' ctypes import * print "AAA:" value = Raw_ Input () V=int (value) Vv=long (value) Vvv=value Class aaa