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java Validate palindrome string Validate palindrome string. Write a program to verify whether a string is a palindrome string: whether to read it from the front and read it from the back are the same. For example, mom and dad are palindromes. The program receives the string input by the user, determines whether it is a palindrome string, and ...

Target: 51job Don't ask me why I climb this, because my technical ability is limited. Very limited. Very limited. 1. Let's see what useful information this website has first. Area, it must be necessary. Where else can I find a job. Why are you looking for a job? What do you say. Directly climb more than 50000, manual funny. Total page ...

1. Introduction to heap sorting Heap sorting is a sort algorithm designed with heap as the data structure. Heap sorting is an optional sort with the worst, best, and average time complexity of O(nlogn), which is also an unstable sort. Large Top heap and Small Top heap A heap is a complete binary tree with the following properties: Each ...

#Multiple data sources under spring mybatis Recently, I encountered the requirement optimization of separation of reading and writing in the project. Here I just record the implementation process, problems and some extensions (smart like me). The implementation method is some public schemes: * * overriding datalookcurrentdetail1 * * 2. Switc ...

Flight information management system Now, in order to improve the user experience, an airline hopes to build a flight information system, and users can operate the flight information according to their needs. The team leader assigned this task to programmer Zhao Dan. Zhao Dan found that the database needs to be operated through Java code, ...

catalogue I Wait for wake-up mechanism II Thread pool III Timer timer I Wait for wake-up mechanism Wait for wake-up mechanism This is a collaboration mechanism between multiple threads. Just like you and your colleagues in the company, you may have competition for promotion, but more often you work together to complete certain tasks. A ...

premise In my spare time after work, I think about writing a set of lightweight ORM framework based on JDBC with Javassist as the core, and studying the source code of mybatis, TK mapper, mybatis plus and spring boot starter JDBC, It is found that LambdaQueryWrapper in mybatis-plus can get the method information (actually CallSite informatio ...

1, Introduction Software Design Pattern, also known as design pattern, is a summary of code design experience that is repeatedly used, known by most people, classified and catalogued. It describes some recurring problems in the process of software design and the solutions to the problems. In other words, it is a series of routines to solve ...

ReentranLock Lock interface is a built-in attribute, not built-in in java language. It can realize synchronous access ReentranLock is the implementation class of Lock interface After java SE 5, a Lock interface (and related implementation classes) is added to implement the Lock function However, it is used to acquire and release locks expl ...

Thread communication mechanism wait notify notify all In this class, we mainly learn the precautions for using the wait/notify/notifyAll method. We mainly start with three questions: Why must the wait method be used in synchronized protected synchronization code?Why is wait/notify/notifyAll defined in the Object class and sleep defined in th ...