Java API (StringBuffer class and StringBuilder class)
String, StringBuffer and StringBuilder can all be used to define string variables, but there are differences.
String - an immutable string, which is essentially a character arrayStringBuffer - variable string, inefficient, thread safeStringBuilder - variable string sequence, high efficiency, thread unsafe
1, StringBuffer class
Thread sa ...
Posted on Sat, 04 Dec 2021 21:05:07 -0500 by jonno946
New JDK feature -- lambda
1.lambda expression
1. Format: (parameter type parameter name) - >{ Method body; Return return value; }
2. Omission rules Parameter types in parentheses can be omitted. If there is only one parameter in parentheses, you can omit parentheses. If there is only one statement in braces, you can omit the braces, the return ke ...
Posted on Sat, 04 Dec 2021 19:54:48 -0500 by priya_cks
Easy to understand explanation of completable future
We have Future and Executor to execute our asynchronous tasks. Why do we need this? When we use Future to obtain asynchronous execution results, there are two methods: call Get() or poll whether isDOne() is True Both methods are not very good, because the main thread will also be forced to wait.
In order to reduce this wait, JAVA8 introduces t ...
Posted on Sat, 04 Dec 2021 18:56:48 -0500 by coolphpdude
Logic control in JAVA
Objectives of this section
(1) . logic control statements of programs in Java
(2) . input and output mode in Java
1. Sequential structure
The sequential structure is relatively simple. For example, the code we wrote before is a sequential structure, which is executed line by line in the order of code writing
System.out.println("aaa");
...
Posted on Sat, 04 Dec 2021 18:43:06 -0500 by hoyo
Make a wheel for Java - Chain
Recently issued Extension method of simulating C# in Java "This article simulates the extension method for Java. But after all, without syntax support, it is still inconvenient to use, especially when it is necessary to continuously interleave the "extension methods" implemented in different classes, switching objects is very cum ...
Posted on Sat, 04 Dec 2021 17:09:32 -0500 by tmc01
Getting started with Java operator
1, Assignment operator
The assignment operator "=" is a binary operator. Its function is to assign the value contained in the operand on the right to the operand of the workshop, such as
int a = 100;
The code is as follows
package Number;
public class Eval {
public static void mai ...
Posted on Sat, 04 Dec 2021 15:25:43 -0500 by dc2_jspec
Spring -- dependency injection or method injection?
Dependency injectionWe are Spring - circular dependency Two dependency injection methods of Spring are discussed inConstructor Injection Attribute injection (setter injection also belongs to this)@Service
public class HelloService {
/**
* Attribute injection
*/
@Autowired
private BeanFactory beanFactory;
/**
* Con ...
Posted on Sat, 04 Dec 2021 15:19:17 -0500 by jstarkweather
Stop threads safely and elegantly
First, ask the question, how do you stop threads safely and elegantly?
Behind this problem, it can be as small as simply terminating a Thread thread, or as large as the elegant offline of a Dubbo application... They all have one thing in common, that is, instead of forcibly stopping a process or thread at once, they have the opportunity to clea ...
Posted on Sat, 04 Dec 2021 13:58:39 -0500 by saunders1989
Spring framework is the technology used throughout the article. After learning, you can easily understand the spring source code
1, Software development overview
2.1 life cycle of software development
Life cycle: the process from project approval to software deactivation
Problem definition and planning: this stage is a joint discussion between the software developer and the demander, mainly to determine the software development objectives and their feasibilityRequirem ...
Posted on Fri, 03 Dec 2021 21:42:37 -0500 by web_master
Algorithm training JAM counting method java problem solving
Resource constraints
Time limit: 1.0s Memory limit: 256.0MB
Problem description
Jam is a science freak who likes to be unconventional. Instead of counting with Arabic numerals, he used lowercase English letters. He felt that doing so would make the world more colorful. In his counting method, the number of digits of each number is th ...
Posted on Fri, 03 Dec 2021 21:38:55 -0500 by freshrod