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pom:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.tedu</groupId>
    <artifactId>Spring01</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <!-- 设置 JDK 版本为 1.8 -->
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.source>1.8</maven.compiler.source>
        <!-- 设置编码为 UTF-8 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
    </properties>

    <dependencies>
        <!-- Spring Context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.annotation</groupId>
            <artifactId>javax.annotation-api</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- 单元测试框架 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>
    </dependencies>
</project>

spring的主要的类：AnnotationConfigApplicationContext

package cn.tedu.day01;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Test {
    public static void main(String[] args) {
        // AnnotationConfigApplicationContext 就是Spring
        //Annotation: 注解\注释
        //Config: 配置
        //Application: 缩写app 应用 应用程序
        //Context: 上下文 当前情况

        //初始化Spring
        AnnotationConfigApplicationContext ctx= new AnnotationConfigApplicationContext(Config.class);
        //从Spring获取Demo对象!
        //ctx 提供了 getBean(类型) 方法, 可以获取Spring创建的对象
        Demo demo = ctx.getBean(Demo.class);
        System.out.println(demo); //toString()  Hello World!
    }
}

主要方法：refresh