Programmer Think

1. PCB on Linux 2. Process State Transition 1.Tristate 2.Pentastate 3.ps command. //Static View Process ps aux(View all current processes) | ajx 4.top command //View process dynamically 5.kill command //Kill Process kill -9/SIGKILL pid Force Kill Process killall -name Process name Kill by process name 6. Process re ...

The so-called resources are things borrowed from the system during the operation of the program. Once used, when you don't use them, you must return them. The most common resource of C + + is dynamic memory allocation, that is, the memory we dynamically allocate from the system with new or malloc. Of course, resources also include other resourc ...

The two core contents of spring are ioc and aop. This chapter introduces the concept, function and usage of ioc. ioc brief introduction: Concept: inversion of control, the creation of objects and the calling process between objects are handed over to Spring for management The purpose is to reduce coupling Underlying principles: xml parsing, f ...

Object oriented concept Process oriented & object oriented Process oriented thought The steps are clear and simple. What to do in the first step and what to do in the second stepFacing the process, it is suitable to deal with some relatively simple problems Object oriented thought Birds of a feather flock together in a classif ...

catalogue 1. Document processing command 1.1 # directory processing 1.2 document processing 1.3 link handling 2. Permission management command 2.1 change authority 2.2 # change of ownership 3. File search command 4. Help command 5. User management commands 6. Compression and decompression command 7. Network command 8. Shutdown and ...

Technical work should be rewarded follow+Click three times (like, comment, collect) and watch again to form a good habit RocketMQ tutorial related series directory catalogue Section I: server preparation Section 2: installing RocketMQ Create rocketmq storage directory Modify runbroker sh Modify runserver sh Section III: Configuration ...

abnormal Abnormal conditions refer to abnormal conditions of the program Corresponding to the classification of exceptions in java, exceptions in java: Throwable serious problems: Error, we don't handle them. Such problems are generally very serious. For example, memory overflow (OOM) problems: exceptions (exceptions) compile time exceptions: ...

1. Preface Cyclic dependence : is N class circular (nested) references. Generally speaking, N beans refer to each other and finally form A closed loop. It can be represented by A classic diagram as follows (A, B and C all represent objects, and the dotted line represents reference relations): ​ In fact, it can be N=1, that is, the cyclic ...

Introduction and use of stack stack is a container adapter, which is specially used in the context of last in first out operation. Its deletion can only insert and extract elements from one end of the container.Stack is implemented as a container adapter. A container adapter encapsulates a specific class as its underlying container, and pr ...

Summary of simulated interview questions  First round interview questions catalogue Summary of simulated interview questions First round interview questions 1, Describe the characteristics of the transaction ACID in the database. 2, What is springboot? Which version does your company use? Second round interview questions The third round ...