#10 effective java: item 1

effective-java/src/main/java/com/example/effectivejava/chapter01/item01/App.java

@@ -0,0 +1,12 @@
+package com.example.effectivejava.chapter01.item01;
+
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+public class App {
+
+    public static void main(String[] args) {
+        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
+        HelloService helloService = applicationContext.getBean(HelloService.class);
+        System.out.println(helloService.hello());
+    }
+}

effective-java/src/main/java/com/example/effectivejava/chapter01/item01/AppConfig.java

@@ -0,0 +1,13 @@
+package com.example.effectivejava.chapter01.item01;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AppConfig {
+
+    @Bean
+    public HelloService helloService() {
+        return new ChineseHelloService();
+    }
+}

effective-java/src/main/java/com/example/effectivejava/chapter01/item01/ChineseHelloService.java

@@ -0,0 +1,8 @@
+package com.example.effectivejava.chapter01.item01;
+
+public class ChineseHelloService implements HelloService {
+    @Override
+    public String hello() {
+        return "ni hao";
+    }
+}

effective-java/src/main/java/com/example/effectivejava/chapter01/item01/HelloServiceFactory.java

@@ -1,15 +1,20 @@
 package com.example.effectivejava.chapter01.item01;
 
+import java.lang.reflect.InvocationTargetException;
 import java.util.Optional;
 import java.util.ServiceLoader;
 
 public class HelloServiceFactory {
 
-    public static void main(String[] args) {
+    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
         ServiceLoader<HelloService> loader = ServiceLoader.load(HelloService.class);
         Optional<HelloService> helloServiceOptional = loader.findFirst();
         helloServiceOptional.ifPresent(h -> {
             System.out.println(h.hello());
         });
+
+        Class<?> aClass = Class.forName("com.example.effectivejava.chapter01.item01.ChineseHelloService");
+        HelloService helloService = (HelloService) aClass.getConstructor().newInstance();
+        System.out.println(helloService.hello());
     }
 }

effective-java/src/main/java/com/example/effectivejava/chapter01/item01/ListQuiz.java

@@ -0,0 +1,26 @@
+package com.example.effectivejava.chapter01.item01;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+
+public class ListQuiz {
+
+    public static void main(String[] args) {
+        ArrayList<Integer> numbers = new ArrayList<>();
+        numbers.add(200);
+        numbers.add(30);
+        numbers.add(120);
+        numbers.add(2);
+
+        System.out.println("numbers = " + numbers);
+
+        Comparator<Integer> desc = (a, b) -> b - a;
+        numbers.sort(desc);
+
+        System.out.println("numbers = " + numbers);
+
+        numbers.sort(desc.reversed());
+
+        System.out.println("numbers = " + numbers);
+    }
+}