Programmer Group

1._JSP 1.1._ What is JSP JSP (Java Server Pages) is a dynamic resource on the Java Web server side. It plays the same role as HTML pages, displaying data and obtaining data. 1.2._jsp composition JSP = HTML + Javascript + JSP action tag (including EL expression) 1.3._jsp script It's essentially Java code snippets Classificatio ...

Two uses of Synchronized Object lock It includes method lock (the default lock object is this, that is, the current instance object) and synchronous code block lock (specify the lock object yourself) Class lock A Synchronized method that modifies a static or specifies a lock as a Class object Example No synchronization effect public clas ...

The time complexity and space complexity of common sorting algorithms are as follows: 1. Algorithm efficiency There are two kinds of algorithm efficiency analysis: The first is time efficiency and the second is space efficiency. Time efficiency is called time complexity, and space efficiency is called space complexity. Time complexity mainly ...

catalogue1 IO,NIO,AIO1.1 basic concepts1.2 NIO details1.2.1 Buffer read / write data1.2.2 Buffer and clear methods1.2.3 Buffer parameters1.2.4 scattering & aggregation1.3 Java AIO1.4 use examples1.4.1 scattering aggregation1.4.2 comparison test of three I / O modes1.4.3 DirectBuffer VS ByteBuffer1.4.4 monitoring code for DirectBuffer1.4.5 A ...

Hello, I'm hehaige. I focus on the back end. If I can, I want to be a code designer instead of an ordinary coder to witness the growth of hehaige. Your comments and praise are my biggest motivation. 1-1: title You are given an array prices where prices[i] is the price of a given stock on the ith day. Find the maximum profit you can achieve ...

1, File storage file store File storage in Android is divided into internal storage and external storage. Internal storage: store the data of the application into the device in the form of a file (under data / [package name of your APP] / files). When the created application is uninstalled, its internal storage file will be deleted. External ...

Classic interview questions of binary tree Before that, I have published the basic knowledge of binary tree: Detailed explanation of binary tree Next, I will tell you some classic and common binary tree interview questions Preliminary interview questions Maximum depth of binary tree Question: Maximum depth of binary tree Solution idea: ...

Spring cloud learning notes 1, Study Preface 1.1 learning premise Proficient in using SpringBoot microservice rapid development frameworkLearned about Dubbo + Zookeeper distributed FoundationThe computer configuration memory shall not be less than 8G(16G and above are recommended) 1.2 article outline Five components of Spring Cloud S ...

-Divide the parts into whole and encapsulate the method (multiple buttons will be set in one interface, which can be written in array, and less code can be written) String[]string={"rectangle","triangle","circular","Trisection point"}; -Containers are divided into top-level container JFrame and general container JPanel -JFrame is the def ...

1, What is method System.out.println(), so what is it? A: System is "class". out is "output object". println() is "method". A Java method is a collection of statements that together perform a function. Method is an ordered combination of steps to solve a class of problemsMethod contained in a class or object ...