Programmer Think

1, Effect display 2, Project introduction \qquad This project uses ArkUI (JS) to develop the interface, uses JS FA to call the interface function of JAVA PA, pulls the local album through JAVA, selects the picture and returns, copies the picture to the directory accessible by ...

day04 summary notes01 array introductionIntroduction: array is a kind of container, which can store multiple values of the same data typeint[] arr = {10,20,'a'}; System.out.println(arr[2]); // 97 double arr = {10,20,30}; System.out.println(arr[0]); // 10.0 ----------------------------------------------- proposal: The same d ...

1. Working principle of countdownlatch CountDownLatch functions as a timer in multithreaded concurrent programming, and maintains a count variable, and its operations are atomic operations. This class mainly realizes its functions through countDown() and await(). First, it establishes a CountDownLatch object, and the incoming parameter is the ...

There are four common types of return values of processor methods annotated with @ Controller: The first: ModelAndView The second type: String The third type: no return value void The fourth type: return custom type objects Use different returns according to different situations preparation: 1. Import required dependencies: <dependencies ...

1. Common spring annotations 1.1 automatic assembly 1.1.1 @Configuration Since Spring 3.0, it has supported a better Configuration method: the Configuration method based on Java classes. The @ Configuration annotation indicates that this is a Configuration class, and its bottom layer is @ Component (that is, the bean object of this class wil ...

day02 summary notes01 identifierIntroduction: the symbols that give names to classes, methods, variables, etcSimply remember: your own nameNaming rules for identifiers:Number 0 ~ 9Character a-z A-Z_ $Cannot be keywordCannot start with a numberStrictly case sensitiveIdentifier naming conventions:Nomenclature of small hump: (variable) I ...

brief introduction   I believe that the biggest motivation for many people to learn distributed locks is not their own system needs, but the needs of interviewers... Of course, this also shows that the distribution lock is very important. It is often used as an examination question. Before learning, we need to clarify several questions. ...

Zero. Learning objectives of this lecture Understand the meaning of bit operationMaster the use of bit operation 1, Bit operator concept Bit operators are symbols that operate on each bit of binary numbers. They operate specifically on numbers 0 and 1. 2, Bitwise operator usage (1) Classification description table operatoroperationexa ...

Mybatis personal summary notes 01 basic information Mybatis is the SQL mapping frameworkThis object can be mapped into a row of data in the databaseDevelopers only need to provide sql, process sql through Mybatis, and finally get the List collection or Java objectsMybatis is a semi-automatic ORM mapping tool, which is called semi-automa ...

1, The blue bridge cup test questions are divided into candy [the fifth session], [provincial competition], [group B] (1) Problem description Time limit: 1.0s memory limit: 256.0MB There are n children sitting in a circle. The teacher gives each child an even number of sweets at random, and then plays the following game: Each child gave ha ...