創建文件 `/Code/z8g/ioc/src/main/java/net/zhaoxuyang/ioc/bean/Bean.java` ，內容為： ```java package net.zhaoxuyang.ioc.bean; public class BeanDefinition { private Object bean; public BeanDefinition(Object bean) { this.bean = bean; } public Object getBean() { return bean; } } ``` 創建文件 `/Code/z8g/ioc/src/main/java/net/zhaoxuyang/ioc/bean/BeanFactory.java` ，內容為： ```java package net.zhaoxuyang.ioc.bean; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class BeanFactory { private Map<String, BeanDefinition> beanDefinitionMap; public BeanFactory() { this.beanDefinitionMap = new ConcurrentHashMap<>(16); } public Object getBean(String name) { return beanDefinitionMap.get(name).getBean(); } public void registerBeanDefinition(String name, BeanDefinition beanDefinition) { beanDefinitionMap.put(name, beanDefinition); } } ``` 創建測試類 `/Code/z8g/ioc/src/test/java/net/zhaoxuyang/ioc/bean/BeanFactoryTest.java` ，內容為： ```java package net.zhaoxuyang.ioc.bean; import java.util.LinkedList; import java.util.List; import org.junit.Test; public class BeanFactoryTest { @Test public void testGetBean() { // [1] 初始化beanFactory BeanFactory beanFactory = new BeanFactory(); // [2] 注入bean List<String> dataList = new LinkedList<>(); dataList.add("A"); dataList.add("B"); BeanDefinition beanDefinition = new BeanDefinition(dataList); beanFactory.registerBeanDefinition("dataList", beanDefinition); // [3] 獲取bean List list = (List) beanFactory.getBean("dataList"); System.out.println(list); } } ``` 在終端執行以下命令： ```shell $ pwd # 顯示當前目錄 /Code/z8g/ioc $ git add pom.xml src # 將pom.xml和src文件夾添加到git暫存區 $ git commit -m 'ioc-step-01-container-register-and-get' # 提交到git倉庫 [master（根提交） 765af9d] ioc-step-01-container-register-and-get 4 files changed, 86 insertions(+) create mode 100644 pom.xml create mode 100644 src/main/java/net/zhaoxuyang/ioc/bean/BeanDefinition.java create mode 100644 src/main/java/net/zhaoxuyang/ioc/bean/BeanFactory.java create mode 100644 src/test/java/net/zhaoxuyang/ioc/bean/BeanFactoryTest.java $ git checkout -b 01 # 檢出新分支 切換到一個新分支 '01' ```