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The basic idea of Java is that "poorly structured code cannot run" Why use exceptions?The first thing we can make clear is that the exception handling mechanism can ensure the robustness of our program and increase the availability

Original link: http://www.361way.com/shell-eval-variable/4957.htmlNesting of variables is often used in the shell. For example, the value of a single or multiple variables as a variable name, and then the variable name to get its internal variables,

The/OPT partition is full of web logs, causing some services to not function properly, so rm-fr off these logs (nearly 11GB), but the service is still not back to normal, with DF-HT, the partition occupies or 100%: [[email protected] opt]#

Python memory management mechanismPython memory management mechanism mainly includes the following three aspects: Reference counting mechanism Garbage collection mechanism Memory pool mechanism Reference countGive an example of

The signal module in the Python standard library is further studied based on the learning basis of the Python learning note-the--linux signal basis for multi-process communication.Although signal is a module in Python, it is primarily for UNIX

Interrupt1. Indicator Range 1.1 Interrupt rateShould be combined with CPU utilization analysis, if CPU utilization is reasonable, a large number of interrupts are acceptable. A large interrupt value, accompanied by a slow performance of the system,

Emacs is the editor of God, and Vim is the god of the editor. Why do they have such a reputation, and listen to this article to you one by one of the way. Author: Jiqing Wu Email [Email

Variable declaration and scope Avoid declaring global variables A global variable is either declared outside of any function or is not declared straightforward to use. Reason: Portability. If you want your code to run

Main.m1-26 class NotesLecturer: Xiao HuiAuthor: Wang XuewenCreated by Lanouhn on 15/1/26.Copyright (c) 2015 Lanouhn. All rights reserved.Pre-compilation (Precompile),#import #define A 12#define SIZE 150#define ADD (A, b) A + b#define MAXVALUE (A, b)

EOF refers to the terminator of a file, which is a macro definitionWith the help of the GetChar and Putchar functions, you can write out without knowing other input/output knowledgeAn astonishing amount of useful code. The simplest example is to

Linux disk space is exhausted by unknown resourcesIn Linux, when we used RM to delete large files on Linux, but if a process opened the large file, but did not close the handle of the file, then the Linux kernel will not release the disk space of

MySQL cluster, MySQL master-slave architecture, MySQL load balancerMySQL Master-Slave synchronizationPrinciple:Replication ThreadsMySQL Replication is an asynchronous copy process, copied from one MySQL instace (we call Master) to another MySQL

We know that, whether on a busy server or a relatively idle PC, the system is not just running a process on Linux, when the user enters a command that we call a process after the program is loaded into memory execution.The core components of the

JavaScript data type 1. What is the data type?The vast majority of the programming languages we touch, the data are categorized, including numbers, characters, logic and authenticity: Int,long,string,boolean .... And so on, we all know that

The main object of this article is CPU and memory. Why learn C language before must understand, because C language is very close to the underlying principle of the language, understand the principle of CPU and memory, to learn C language has a great

Http://www.cnblogs.com/hanyan225/archive/2010/10/28/1863854.html1, ConceptDMA is a hardware mechanism that allows two-way data transfer between peripherals and system memory without the involvement of the CPU. The use of DMA can be the system CPU

In short, this technique corresponds to one of the following scenariosSuppose there is text as followsccccaaaabbbbddddbbbbccccaaaaNow it needs to be re-processed, this is very simple, sort-u can be done, but if I want to keep the text in the

Shing Email: [Email protected] Blog: http://blOg.csdn.net/qifengzou Date: 2015.03.20 01:00 Reprint please indicate the CSDN blog from "Chifeng" Upgrade the current kernel (2.6.32-220.el6.x86_64) to the target kernel

1, short s1 = 1; s1 = s1 + 1; what's wrong? short S1 = 1; S1 +=1; what's wrong?A: For short s1=1;s1=s1+1, the type of the expression that is automatically lifted when the s1+1 operation is int, the type conversion error occurs when you assign an int

1, Ping 127.0.0.1: 127.0.0.1 is a local circular address and if this address is not ping, the local machine TCP/IP protocol does not function. 2, ping This computer IP address: Use Ipconfig to view the native IP, and then ping the IP, the general