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Difference between Java enhanced for loop and normal for

Working with scenesAn enhanced for loop can only be used in an array, or on a collection class that implements the Iterable interfaceSyntax format:For (Variable type variable: An array or collection that needs to be iterated) {}Import java.util.ArrayList;Import Java.util.HashMap;Import Java.util.Iterator;Import Java.util.LinkedHashMap;Import java.util.List;Import Java.util.Map;Import Java.util.Set;Import Java.util.Map.Entry; public class Fortest {public static void Main (string[] args) {Fortest

The difference between <context:annotation-config> and <context:component-scan>

Turn from: Good spring The annotations above that are used to activate a bean that has already been registered in the spring container (either through XML or through the package sanning) is an annotation processing tool that simply injects, regardless of the registered bean.You can also scan and register JavaBean under the specified package, that is, both inject and register beans.Let's look at their differences in detail in the examples below,There are three class a,b,c, and the B,c object is i

MySQL sorting principle and case analysis _ MySQL

red. Because the number of bytes returned by the first query exceeds max_length_for_sort_data, the sorting adopts regular sorting. in this case, MYSQL sorts rowid and converts random IO to sequential IO, therefore, the return value is 5 before and 6 after, while the second query uses optimized sorting, without the second data retrieval process, keeping the relative position of the record after sorting. If you want to optimize the sorting of the first statement, set max_length_for_sort_data to a

"Go" Python Code debugging Tips

return or R executes the code until it returns from the current function exit or Q abort and exit next or n execute next line pp Print variable value help help Here's a concrete example of how to debug with the PDB.Listing 1. Test code exampleImport pdb a = "AAA" Pdb.set_trace () b = "BBB" c = "CCC" final = a + B + C print

Puppet function multi-layer Path transformation array

=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 in environment production in 1.03 Secondsnot

SED single-line script Quick Reference (Stream Editor) page 1/2

and last lines in the fileSed-e '$! {H; d;} '-e x # enter a blank line when there is only one row in the file.Sed-e '1 {$ q;} '-e' $! {H; d;} '-e x # This row is displayed when there is only one row in the file.Sed-e '1 {$ d;} '-e' $! {H; d;} '-e x # when there is only one row in the file, no output# Only display rows matching Regular Expressions (simulate "grep ")Sed-n'/regexp/P' # method 1Sed '/regexp /! D' # method 2# Show only the rows that do not match the regular expression (simulate "gre

Class loading order for Java

Class loading order for JavaFirst, load order1. Initialization of the static member variable of the parent class1.1. Static code block1.2, ordinary code block1.3, no parameter constructor2. Static code block for parent class3. Initialization of a static member variable of a subclass  3.1. Static code block  3.2, ordinary code block3.3, no parameter constructor4. Static code blocks for subclasses5. The normal member variable of the parent class is initialized5.1. Static code block5.2, ordinary co

Summary of several methods for debugging Python code _python

Debugging with the PDB The PDB is a Python-brought package that provides an interactive source code debugging feature for Python programs, including setting breakpoints, stepping through debugging, entering function debugging, viewing current code, viewing stack fragments, dynamically changing the values of variables, and so on. The PDB provides some common debugging commands, as detailed in table 1.Table 1. PDB Common commands The following is a concrete example of how to use the PDB for de

The Python code uses the PDB debugging technique

current function exit or Q abort and exit next or n execute next line pp Print variable value help help Here's a concrete example of how to debug with the PDB.Listing 1. Test code exampleImport pdb a = "AAA" Pdb.set_trace () b = "BBB" c = "CCC" final = a + B + C print finalStart debugging: Run the script directly, will stay at Pdb.set_trace (),

Summary of several methods for Python code debugging

This article mainly introduces several methods to debug Python code. This article comes from the technical documentation on the IBM official website. For more information, see Use pdb for debugging Pdb is a python package that provides an interactive source code debugging function for python programs, main features include breakpoint setting, single-step debugging, function debugging, viewing current code, viewing stack fragments, and dynamically changing variable values. Pdb provides some comm

Regex dishes [continue]

Regular dishes (continue for help) aaa. bbb. ccc. ddd $ aaa. bbb. ccc. ddd... aaa. bbb. ccc. how to replace ddd with regular expressions with aaa. bbb. ccc. ddd $. b. c. d... aaa. bbb. ccc. I didn't ask a question for ddd twice. ------ solution ------------------ try it firs

Beaglebone Black–gpio Switch LED (transistor and Relay experiment)

On a, with GPIO direct power to the LED, with high and low level for switch, not reliable. A GPIO is a signal, not a power supply. Moreover, a GPIO can only give poor 5mA or so, take more will burn (I did not burn do not know if it is really going to burn, but the instructions above is written). This is not playing, so I did the following transistor experiment. 2N3904 parameters please click here. This is not recommended, LCM is 200mA, but I only have it, no way. Transistor, I use it as a switc

Jquery obtains the object positioning sub-Object

Special characters selected: # ID. Indicates class* Select all, Select multipleSpace descendant> Sub-~ Brother+ Next: Sub-function)() Functional filtering and searching Get all the title objects under the DIV: $ ("Div: Header ")CopyCodeThe Code is as follows: Get all title objects: $ (": Header ")Copy codeThe Code is as follows: get first, for example, $ ("Li: First") or $ ("Li "). first () or $ ("Ul: First") or $ ("Ul Li: First") copy Code the code is as follows: AAA

Linux-shell script command grep

[grep profile : ]grep is used to filter lines that contain specific charactersusage: grep ' pattern ' fileFor example: grep ' BBB ' aaa.txt--color # Search for the keyword BBB from the file Aaa.txt and highlight it.[Regular meta-character : ]grep can be used in conjunction with regular expressions, the following describes the use of some commonly used regular expression filter characters . 1. ^ Denotes

PYTHON_67 special Member of object-oriented class Setitem/getitem/delitem

#成员的种类: Normal field static field normal method static method class method General characteristicsClass FFF: x= ' xxxxxdddd ' __x1= ' x11111111 ' __ ' is a member modifier, and X1 is the modified variable field that is only accessed internally def __init__ (self): Print (' 111 ') Self.__name= ' name222 ' #这个name依旧是那个私有的字段 is still not to be called def fetch (Self,bak): Print (BAK) Print (FFF.__X1) def __call__ (self, *args, **kwargs): Pri

Python PDB summary

Tags: OCA script summary Pytho class ALS Erro turn code snippetThe debug feature is very important for developer, and Python provides the appropriate module PDB so that you can debug with a text editor to write scripts. The PDB is the abbreviation for Python debugger.Some of the commonly used commands are:Command useBreak or B to set a breakpointContinue or C continue to execute the programList or L view the code snippet for the current rowStep or S entry functionReturn or R executes the code un

Mysql reorganizes notes -- woods memo

, 'Finance Department '); insert into tb values (2, 'hr Department'); insert into tb values (3, 'Science and Technology Department '); insert into ta values (1, 'Liu bei ', 1); insert into ta values (2, 'guan Yu', 2); insert into ta values (3, 'zhang Fei ', 3); mysql> select * from ta; + ---- + ------ + ------- + | id | name | tb_id | + ---- + ------ + ------- + | 1 | aaa | 1 | 2 | bbb | 2 | 3 | bbb | 4 | +

Mysql reorganizes notes -- woods memo, mysql -- woods

; select * from ta; + ---- + ------ + ------- + | id | name | tb_id | + ---- + ------ + ------- + | 1 | aaa | 1 | 2 | bbb | 2 | 3 | bbb | 4 | + ---- + ------ + ------- + mysql> select * from tb; + ---- + ------ + | id | name | + ---- + ------ + | 1 | xxx | 2 | yyy | 3 | yyy | + ---- + ------ + 1. cartesian Product query: one corresponding record, m records, and n records are queried in two tables. Finally,

Tstringlist Common operations

Tstringlist Common operations//Tstringlist Common Methods and properties:VarList:tstringlist; I:integer;BeginList: =Tstringlist.create; List.add (‘Strings1‘);{Add to}List.add (‘Strings2‘); List.exchange (0,1);{Replacement}List.insert (0,‘Strings3‘);{Insert}I: = List.indexof (‘Strings1‘);{The first occurrence of the position}List.sort;{Sort}list.sorted: = True;{Specify sort}List.count;{Total}List.text;{Text Collection}List.delete (0);{Delete, 0 is the first data}List.loadfromfile (‘C:\tmp.txt‘);{

Common tstringlist operations

// Common tstringlist methods and attributes: VaR List: tstringlist;I: integer; Begin List: = tstringlist. Create;List. Add ( 'Strings1' ); {Add} List. Add ( 'Strings2' );List. Exchange ( 0 , 1 ); {Replacement} List. insert ( 0 , 'Strings3' ); {Insert} I: = List. indexof ( 'Strings1' ); {Location of the first appearance} List. Sort; {Sorting} List. Sorted: = true; {Specified sorting} List. count; {Total

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