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Introduction to Java Concurrent Programming and Thread Safety Basics

In future development, our projects will all run on the server, and the server has already implemented the definition of threads, the creation of thread objects, and the startup of threads. We don't need to write any of this code. The most important thing is: you need to know that the program you write needs to be run in a multi-threaded environment, and what you need to pay more attention to is the data.

Feb 24, 2021 am 10:10 AM

java Thread safety

What are the indexof methods in java?

The indexof methods in java are: 1. [indexOf(String str)] returns the specified character str in the string; 2. [indexOf(String str, int index)] returns the specified character str starting from the index position to find the specified character str in the string. Index once.

Feb 22, 2021 pm 03:24 PM

java

Discuss in detail the time for Java to set session timeout (expiration)

After logging in to a general system, a current session expiration time will be set to ensure that the user automatically logs out if they do not interact with the server for a long time. There are three specific methods for destroying the session. This column will introduce it in detail.

Feb 19, 2021 pm 05:37 PM

java

How to solve the problem that the project bar on the left side of eclipse is missing

Solution: First open the eclipse software, click the "window" option in the top navigation bar; then click the "show view" option in the open drop-down menu; then click the "project Exlorer" option in the open menu to adjust Exit the project bar on the left.

Feb 19, 2021 pm 05:14 PM

eclipse

How to connect sqlserver database in java

How to connect sqlserver database with java: first prepare the JDBC driver and set up the database; then configure the network and restart the SQL server after applying the settings; finally check whether port 1433 is open.

Feb 19, 2021 pm 12:05 PM

java sqlserver

Introducing Lambda expressions, the syntactic sugar of Java 8

Using lambda expressions can reduce the amount of code in our program to a certain extent and optimize the quality of the code. Lambda expression is a new feature of Java8 and one of the most worth learning new features in Java8.

Feb 18, 2021 pm 06:09 PM

java8 lambda

Introduction to Java Process Control

In the basic syntax we learned before, we did not realize the interaction between programs and people, but Java provides us with such a tool class that we can obtain user input; java.util.Scanner is a new feature of Java5, and we can use Scanner Class to obtain user input.

Feb 15, 2021 am 10:27 AM

java process control

Java program development learning JDBC and MySQL database

The java basics column introduces JDBC and MySQL databases for program development and learning. The introduction is detailed. Friends in need can take a look. When writing, you can encapsulate it in a class to simplify the code.

Feb 11, 2021 am 10:33 AM

java jdbc mysql database

Java introduces eight locks to help you thoroughly understand object locks and class locks

The Java basic tutorial column introduces how to thoroughly understand object locks and class locks. Friends in need can read it and discuss it together.

Feb 09, 2021 pm 06:06 PM

java

Java introduces Lock and producer-consumer issues

True multi-threaded development, development in the company, reducing coupling, a thread is a separate resource class without any attached operations, the Java basics column will explain it in detail, friends in need can take a look.

Feb 09, 2021 pm 05:43 PM

java Concurrent programming

How to generate random numbers in java

How to generate random numbers in java: 1. Use the [java.util.Random] class to generate a random number generator; 2. The returned value is a double value of [[0.0,1.0)].

Feb 09, 2021 pm 04:18 PM

java random number

What are the three ways of spring ioc injection?

The three ways of spring ioc injection are: 1. Setter method injection. After the container instantiates the bean by calling the parameterless constructor or parameterless static factory method, it calls the setter method of the bean. 2. Constructor method injection. 3. P namespace injection.

Feb 04, 2021 pm 05:47 PM

java

How to convert string to integer in java

How to convert a string into an integer in java: first enter a numeric string; then convert it through [Integer.parseInt()], the code is [String s="123456";int b=Integer.parseInt(s);].

Feb 03, 2021 am 11:31 AM

java string

Java concurrent programming, introducing commonly used auxiliary classes

CountDownLatch is a synchronization tool class used to coordinate synchronization between multiple threads, or to communicate between threads (rather than serving as a mutual exclusion). CountDownLatch enables one thread to wait for other threads to complete their work before continuing to execute. Use a counter to implement..

Feb 02, 2021 pm 05:38 PM

java concurrency