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control flow statemet:

package controlflowmethod; what is while? In Java, the while loop is used to execute a block of code repeatedly as long as a given condition is true. public class While { public static void main(String[] args) { task 1 the i value is 0, the c

Jan 29, 2025 pm 04:14 PM

spring-: spring-boot-bootstrapping-behind-the-scenes

There are many steps hidden behind the Spring Boot application. This article will gradually analyze its logical execution order. 1. Spring Boot application startup step 1.1 JVM startup and main class load The Java virtual machine (JVM) starts and loads the main class containing the Public Static Void Main (String [] ARGS) method. 1.2 Execute SpringApplication.run () method Execute the SpringApplication.run () method, and start the Spring Boot application. This is the entrance point for all Spring Boot applications. 1.3 initialization

Jan 29, 2025 pm 04:13 PM

spring-: classloader-in-java-vs-spring

The concept of class loader in Java The class loader in Java is part of the environment of the Java runtime, and is responsible for loading the class to the Java virtual machine (JVM). The Java application uses a class loader to load class files on demand, rather than loading all classes during startup. Main features: Dynamic loading: Class is loaded on demand when reference. Entrust model: Following the father's commissioned model, the requests of loading class are passed to the parent class before trying the local loading. Class isolation: It helps to maintain class isolation, which is particularly useful in complex systems such as application servers. Type of class loader: Guidance class loader: Load the core Java class from Java.lang, Java.util and other. JV

Jan 29, 2025 pm 04:12 PM

spring-: how-spring-boot-determines-application-context

Spring Boot automatically determines the implementation of Application Context Call SpringApplication.Run (MySpringBootapp.class, ARGS); then, Spring Boot will automatically determine the correct ApplicationContext implementation according to the following factors: Class path (dependencies in the project) Running application type (web or non -web) Determine process SpringApplication uses the following logic to select the right ApplicationContext: like

Jan 29, 2025 pm 04:08 PM

Day16

Conditional Statements in Programming Conditional statements, such as Java's if-else construct, govern program execution based on specified conditions. The fundamental structure involves a condition followed by code blocks for both true and false ou

Jan 29, 2025 pm 04:05 PM

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Jan 29, 2025 am 12:19 AM

Java if-else Statement

Java conditional sentence detailed explanation: IF, ELSE, ELSE IF and nested IF statements This article will explore the conditional statements in Java, including if, else, else if, and nested IF statements, and explain how to use them to control the program. We will help you understand the working principles of these sentences and their application in actual programming through clear grammar examples and code examples. Java uses the following conditional statements to execute different code blocks according to different conditions: If statement: When the specified condition is true, execute the code block. Else statement: When the conditions in if statement are fake, execute the code block. else

Jan 28, 2025 pm 10:15 PM

spring-: setBeanName()-of-BeanNameAware-BeanFactory

This detailed walkthrough illustrates the BeanNameAware interface's setBeanName() method within a simple Java Spring application. Let's explore the execution flow step-by-step. 1. Program Execution Begins (main()) The program starts in the main() me

Jan 28, 2025 pm 10:13 PM

spring-: logical-execution-order-and-code-flow

This diagram illustrates the step-by-step execution flow and bean lifecycle within a Spring application. Let's break down the process: Phase 1: Application Context Initialization The application starts by creating a Spring AnnotationConfigApplication

Jan 28, 2025 pm 10:12 PM

spring-:implementations-of-ApplicationContext

The Spring framework provides the implementation of multiple ApplicationContext interfaces to adapt to different application scenarios and application types. The following is the key implementation subdivision: 1. Configuration based on annotations AnnotionConfigapplicationContext It is used for independent implementation of Java configuration (@Configuration,@Bean,@Component, etc.). Very suitable for modern Spring applications, these applications do not use XML configuration. Commonly used in Spring Boot or independent applications. 2. Based on XML configuration Classpathxmla

Jan 28, 2025 pm 10:11 PM

java-core-: programming-to-an-interface

Interface programming rather than class programming is the best practice, because it improves the flexibility and scalability of the code, and follows the core principles of object -oriented programming (OOP). The following are some reasons: 1. Promote abstraction Interface definition contract: What should interface specifies should be done, not what should be done. This abstract decoupling client code (dependence on interface) and specific implementation. For interface programming, you focus on defining behaviors rather than specific implementation. 2. Support the principle of dependencies (solid) Relying on inverted principles (DIP): high -level modules (business logic) should not depend on low -level modules (implementation); both should rely on abstraction (interface). For example: Paymentpr

Jan 28, 2025 pm 10:09 PM

spring-: why-spring-cannot-match-by-name-for-injection

Spring dependency injection: Why can't it be matched automatically by the name? Spring's dependency injection mechanism is mainly based on type, not names. When encountering multiple types of the same type (such as TenantDataSource), it will not automatically return to match according to the parameter name. This is because Spring cannot always guarantee the parameter name in the method to match the Bean name. Java will not retain the parameter name in the bytecode compiled by default. If there is no special configuration, parameter names (for example, Tenantadatasource and TenantbDataSource) will be cleared during the compilation period and replaced them with universal names, such as

Jan 28, 2025 pm 10:08 PM

spring-: @Configuration-in-depth

In -depth understanding of @Configuration annotation in the Spring framework The @Configuration annotation in the Spring framework is used to mark the source defined by a class. In Spring's Java -based configuration, this annotation is very important. It allows developers to configure the application context without XML. When a class is annotated with @Configuration, Spring will treat it as a configuration class and processes it to generate and manage Spring Bean. This type usually contains one or more methods with @Bean annotation, which defines bean managed by Spring container. @Configur

Jan 28, 2025 pm 10:06 PM

spring-: who-calls-setBeanName()?

The Spring framework is in the Bean initialization stage. As part of the Spring Bean life cycle, SetBeanname (String Beanname) method is called. If Bean implement the Beannameaware interface, this will automatically happen. The following is a detailed explanation of when the setbeanname () method, who, and how to call: Who calls setbeanname ()? Spring IOC (control reversal) container call setbeanname (). When bean is initialized and registered to the Spring context, the Spring container will check whether bean has achieved BE

Jan 28, 2025 pm 10:05 PM