Java

Basic data type:Byte 1 bytes positive or negative can represent 2 of the 8-1 square -128~127 (including 0)Short 2 bytes 2 of 16-1 timesInteger type (default is int type)int 4 bytes 2 of 32-1 Times SquareLong 8 byte 2 of the 64-1-time long type is

20165204Java Second week study summary Learning ContentThere is a wide range of learning courses this week, but because of the foundation of the C language, it is possible to understand it more smoothly. The following is a summary of the video

1. Learning Goals(1) Every week on time to complete the tasks assigned by the teacher.(2) Listen to the teacher carefully, do not understand the private to do homework.(3) The teacher left the problem, down serious thinking.2. About the difference

There are only two types of singleton patterns: lazy and a hungry man, and then, because you see a word, if you privatize the constructor, others use reflection, this time what to do, so you know the third way to enumerate patterns. And then today

Java reads the configuration file under the resource directory1: Configure files under the resource directoryhost:127.0.0.193002: Read/represent Resource directory this. getclass (). getResourceAsStream ("/config.properties"); New

Writing purposes: Most Java frameworks, such as spring,hibernate, use dynamic proxies to generate new classes when the program is running.Sometimes in order to learn, or in-depth understanding of dynamic agents, want to see the source code of

1.breakBreak can only be used in a switch statement and a loop statement to jump out of the current loop, but if it is a nested loop,You can only jump out of the current layer of the loop, only to break out of all loops for (int i = 0; i ) {

20165305 "Java program design" the first week to summarize the learning content of learning materialsI focused on the first chapter of the JDK installation, which is a further understanding of some Java basics.Introduction to the Java platformJava

Example of how to integrate redis and spring, redisspring Preface Everyone who has worked on a large software system knows that as the system data grows and becomes more complex, the resulting problem is that the system performance is getting worse

Java Implementation of redis publishing and subscription (easy to understand), javaredis There are too many application scenarios for redis. Now we will introduce one of its major features, pub/sub ). Features: What is redis publishing and

Java internal class knowledge and Java class knowledge Java internal class I. Meaning In Java programming language, a program is constructed by class. You can declare a class within a class. We call this class an internal class. Ii. Functions •

The most difficult Java interview questions in history The questions are as follows: public class TestSync2 implements Runnable { int b = 100; synchronized void m1() throws InterruptedException { b = 1000; Thread.sleep(500); //6

Spring Security builds a rest service to implement rememberme and restrememberme Spring security remembers my basic principles: Upon login, the request is sent to the filter UsernamePasswordAuthenticationFilter. After the filter is successfully

Sample Code of the AuditorAware audit function based on Spring Data, Spring Data provides the audit function: when the entity is created or modified. Spring Data allows you to add @ CreatedBy, @ LastModifiedBy, @ CreatedDate, @ LastModifiedDate

Install and use Maven private server Nexus This article describes how to install and use the Maven private server Nexus. The details are as follows: 1. Install 1.1 install and accelerate docker yum update && yum install dockersudo mkdir -p

Spring Security forcibly exits the method of the specified user, springsecurity Application scenarios Recently, some people in the community have posted articles with Small advertisements, which seriously affects the Community atmosphere! This type

Mybatis getting started, mybatis getting started As a java learner, I believe that JDBC is the first access to and an entry-level database connection method, so let's first recall how JDBC works as a Java API used to execute SQL statements. The

002 variable, Content: Java variables, basic data types Logical type: boolean = true/falseInteger: byte occupies one byte, short occupies two bytes, int occupies four bytes, and long occupies eight bytes. int can express the decimal range (21474836

Specifies the jdk version in eclipse and jdk in eclipse. Background: The machine is installed with jdk 7 and 8. In the command line, the java version is 1.7, while neon requires jdk 1.8, and does not want to modify the system's default jdk version.

MongoDB Learning (1) Installation configuration and simple application, mongodb installation Configuration1. installation and deployment 1. Server Installation 1, official website download (Official Website