Programming VIP

array 1. Array concept Array: A fixed container for storing multiple elements of the same data type in a program. Prerequisites for arrays (characteristics): 1. Once the array is initialized, its length is fixed; 2. The elements in an array must be of the same data type in memory; 3. The number of elements in the array must be multiple; ...

Multithreading (Continued) Lock lock Although the synchronization code block and synchronization method solve the thread safety problem, they can't express where the Lock is added and where the Lock is released, so in jdk1 After 5, a new Lock object is provided: Lock Lock is an interface with two methods: void lock(): lock; void lock(): rel ...

1. What is the function? Wikipedia definition of function: subroutine Subroutine is a part of code in a large program, which is composed of one or more statement blocks. It is responsible for completing a specific task and has relative independence compared with other codes. Generally, there are input parameters and return values, which prov ...

preface Filter, Interceptor, Resolver and Aop are technologies often used in our application development. In this section, we will introduce their usage and application scenarios. text filter Filter is a means of preprocessing web resources that depends on the existence of servlet. It does not depend on the start of spring container. It ...

Synchronized principle Chapter one: three problems of concurrent programming visibility concept Visibility: when one thread modifies a shared variable, other threads get the latest information immediately after the modification demonstration //1. Static member variable private static boolean var = true; public static void main(String[] ...

Section 5 operators and operator overloading In C + +, the operator itself is a function that can be customized by users. Then we think that the calculation of complex numbers is not as good as using the + sign directly, and the concept and operation rules of the + sign need operator overloading. Operator overloading can be written in two way ...

java backend to achieve addition, subtraction, multiplication, division and proportion calculation In Java The math package provides the API class BigDecimal, which is used to accurately calculate the number of more than 16 significant bits. BigDecimal creates objects, so you cannot directly perform mathematical operations on its objects using ...

IntroductionIn the previous article, the "animation" scheme was used to realize the bullet screen effect. The container control was customized. Each bullet screen was used as its sub control, and the initial position of the bullet screen was placed outside the right side of the container control. Each bullet screen was translated thro ...

Enables EventLoop to handle timer events Timing function Used to make the program wait for a period of time or schedule a scheduled task: sleep alarm usleep nanosleep clock_nanosleep getitimer / setitimer timer_create / timer_settime / timer_gettime / timer_delete timerfd_create / timerfd_gettime / timerfd_settime chooses this method. ...

Generic Programming When learning function overloading before, we wrote a Swap function Swap void Swap(int& left, int& right) { int tmp = left; left = right; right = tmp; } void Swap(char& left, char& right) { char tmp = left; left = right; right = tmp; } void Swap(double& left, double& right) { double tmp ...