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We know that there are two types of synchronized: The synchronization method (synchronized) and the synchronous statement block (synchronized block). So what are the differences and the pros and cons of these two?Synchronizedmethod:Advantages:

1 average score per person (repeat only once): Javascript:var t=function (tag,s) {return (s | | Document). getElementsByTagName (tag); var n=function (name) {return Document.getelementsbyname (name)};var total=t ("var") [0].innerhtml-0;var scores=n (

1. Simple Variables ============== 1. Integer$ X = 123456;Perl stores integer data in floating-point registers. In fact, integer variables are treated as floating-point numbers in Perl, but they are only a special column of floating-point data.The

1 average score for each person (only one score for repeated replies ):Javascript: var t = function (tag, s) {return (s | document ). getElementsByTagName (tag) ;}; var n = function (name) {return document. getElementsByName (name)}; var total = t ("

Each PHP Error message Warning:call-time pass-by-reference has been deprecated; If you would a-pass it by reference, modify the declaration of each (). If you would as to enable Call-time pass-by-reference, you can set

I. Data Types(Data type): Perl has four data types: Scalar (variable), Scalar Array (Array), Hash Array (Hash), and References (pointer ), it seems to be rare, but it is more than enough to use it. Especially when writing Perl programs, you do not

String interception of Linux is useful. There are eight ways.Suppose there is a variable var=http://www.aaa.com/123.htm.1. # Intercept, delete the left character, leave the right character.echo ${var#*//}where Var is the variable name and the # is

The first four methods are to remove some characters, and the last four methods to preserve certain characters1, # Intercept, delete the left character, retain the right charactervar= "Hello World"Echo ${var#*l}Results:Lo Worldwhere Var is the

one. DataType (data type ):Perl's data types are roughly four: Scalar (variables), Scalar Array (array), hash array (hash), References (pointer), but they seem to be small but more than sufficient. In particular, you can write a Perl program without

One, List A list is a sequence of values enclosed in parentheses that can be any value or NULL, such as: (1, 5.3, "Hello", 2), empty list: ().Note: A list containing only one numeric value (for example: (43.2)) is different from the value itself

Question: How does the shell judge a filename to start with a character ~ Solve: #var = "cn get the length of me" #$1:parameter 1 to judge the name of the file Var=$1 Iscn=false # ${var:0:2} takes the Var substring from the No. 0 character and

I. List The list is a sequence of values contained in parentheses. It can be any value or empty, for example: (1, 5.3, "hello", 2), empty list :(). Note: The list containing only one value (for example, (43.2) is different from the value itself (I

1. ListA list is a sequence of values contained in parentheses, which can be any number, or empty, such as: (1, 5.3, "Hello", 2), empty list: ().2. Arrays--Storage of listsThe list is stored in an array variable, and the array variable starts with

One, List A list is a sequence of values enclosed in parentheses that can be any value or NULL, such as: (1, 5.3, "Hello", 2), empty list: (). Note: A list containing only one numeric value (for example: (43.2)) is different from the value itself

Question: How does the shell judge a filename to start with a character ~ Solve: #var = "cn get the length of me" #$1:parameter 1 to judge the name of the file Var=$1 Iscn=false # ${var:0:2} takes the Var substring from the No. 0 character and

Linux Shell intercepts strings There are many ways to intercept strings in the shell${var#*/}${var##*/}${var%/*}${var%%/*}${var:start:len}${var:start}${var:0-start : Len}${var:0-start} Here are a few examples to illustrate:1) Get the

HTML and XHTMLXHTML (extensible Hypertext Markup Language, Extensible Hypertext Markup Language) is the standard for redefining HTML (hypertext Markup Language, Hypertext Markup Language) as an XML application.Two types of syntax (and) are defined

$? Represents the return value for executing the previous command: If 0 means execution succeeds, non 0 means execution fails$, $ 、。。。 Represents the parameter 1, parameter 2, respectively 、。。。$# indicates the number of parameters for this program$*/

Java calls the DLL dynamic library-JNI method implemented by C/C ++, javajni Due to the needs of the project, I recently studied how to call the DLL in java and wrote it here for future reference: JNI: Java Native Interface (JNI) is a part of the

A recent project to develop web-side face recognition projects, face recognition algorithm has been written, is the C + + version, but the web side requires the use of Java background, which involves the Java call DLL problem. After searching, a