Java

Before learning Java, we all have an essential step, install JDK and Tomcat, installation is also easy, but each time the environment configuration is always to check the data to configure, today will be the configuration of the steps to summarize,

Packagewellgrounded;Importjava.io.IOException;ImportJava.nio.file.FileVisitResult;ImportJava.nio.file.Files;ImportJava.nio.file.Path;Importjava.nio.file.Paths;ImportJava.nio.file.SimpleFileVisitor;Importjava.nio.file.attribute.BasicFileAttributes;/**

Scenario One: Tomcat's defaultservlet to handle static filesput it in front of the Dispatcherservlet and let Defaultservlet intercept the request so that the request does not enter spring.Scenario two: After the spring3.0.4 version provided the

1 ImportJava.text.DecimalFormat;2 3 Public classMain {4 /**5 * Display JVM total memory, JVM maximum memory and total free memory6 */7 Public voiddisplayavailablememory () {8DecimalFormat DF =NewDecimalFormat ("0.00″);9 Ten

Springboot integrates apache shiro and springbootshiro In the past few days, shiro has been learned due to project needs, which leaves some records and hopes to help shiro beginners. Springboot is a new project in the past two years. It is designed

Java isAssignableFrom () method and instanceof () method usage, javainstanceof usage Summary: IsAssignableFrom ()The method is fromClass inheritanceFrom the perspective,Instanceof ()The method is fromInstance inheritance. IsAssignableFrom

Mybatis Result Maps grouping 3 results -- one-to-multiple limit and mybatis3 -- Reprinted Please note:TheViper http://www.cnblogs.com/TheViper In the previous two articles, the results of multiple tables are extracted first, and then automatically

Java NIO: Analysis of the I/O model and nio Analysis Many friends may feel a little hard to learn NIO, but they do not feel so clear about many concepts. Before entering Java NIO programming, we will discuss some basic knowledge today: I/O models.

What is the difference between String and StringBuffer ?, Stringstringbuffer I often use String. To be honest, the number of StringBuffer operations is really small. The only method that makes me feel special is that the appand method is unique to

Design Pattern _ Bridge patternBridge Pattern Decouple an independent action from its implementation so that the two can vary independently)     ExampleTianxianxi, all of which are Lili; the world is bustling, all to benefit from reality and

Equals () of the three methods to be reloaded in Java data abstraction () Boolean equals (Object x ); This method is very different from the operator "=". equals checks whether the value of an object is logically equal. That is, "=" simply

Java serialization and deserialization learning notes Person class to be serialized:   Package cn. itcast_07; import java. io. Serializable;/** NotSerializableException: Non-serialization exception ** class to enable its serialization function by

Java multithreading -- ThreadPoolExecutor (thread pool)What is a thread pool?   In multi-threaded development, because the number of threads is large and the execution of each thread ends for a period of time, frequent thread creation is required.

Basic Principles of java Design Patterns Two principles have been introduced earlier.Open and closed PrincipleSingle Responsibility PrincipleLet's take a look at another principle: the Dependency inversion principle, which includes two aspects:A.

Spring -- new feature in 4.0 -- generic dependency Injection Generic dependency injection is a new feature of spring4.0. Directory structure BaseService. java class public class BaseService { @Autowired private BaseRespository

Java Virtual Machine Garbage CollectorGarbage collection algorithms used by the Garbage CollectorMark-Sweep Algorithm: First, all objects to be recycled are marked, and all marked objects are recycled after marking. It has two main disadvantages:

String input Problems String input problems:   1. format the input function: scanf (Format String, address );. Match the data entered by the user with the formatted string, assign the matched data to the memory of the address, and use % s as the

Build a spring environment and integrate it with struts 1. First import the packages required by spring   2. Add the spring listener and the location of the spring configuration file to the web. xml file.  

SpringMVC -- DispatcherServlet detailsRoles of DispatcherServletDispatcherServlet is the implementation of the front-end controller design mode. It provides Spring Web MVC centralized access points and is responsible for assigning responsibilities.

Java object serialization and deserializationJava object serialization and deserialization In Java, if we want to save the Instantaneous State values of an object, so that we can get these values in the next use, or persist the object, or use RMI