refactoring : middle man - remove middle man

refactoring/src/main/java/com/example/refactoring/_18_middle_man/_38_remove_middle_man/Department.java

@@ -0,0 +1,14 @@
+package com.example.refactoring._18_middle_man._38_remove_middle_man;
+
+public class Department {
+
+    private Person manager;
+
+    public Department(Person manager) {
+        this.manager = manager;
+    }
+
+    public Person getManager() {
+        return manager;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_18_middle_man/_38_remove_middle_man/Person.java

@@ -0,0 +1,17 @@
+package com.example.refactoring._18_middle_man._38_remove_middle_man;
+
+public class Person {
+
+    private Department department;
+
+    private String name;
+
+    public Person(String name, Department department) {
+        this.name = name;
+        this.department = department;
+    }
+
+    public Department getDepartment() {
+        return department;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_18_middle_man/_38_remove_middle_man/_before/Department.java

@@ -0,0 +1,14 @@
+package com.example.refactoring._18_middle_man._38_remove_middle_man._before;
+
+public class Department {
+
+    private Person manager;
+
+    public Department(Person manager) {
+        this.manager = manager;
+    }
+
+    public Person getManager() {
+        return manager;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_18_middle_man/_38_remove_middle_man/_before/Person.java

@@ -0,0 +1,17 @@
+package com.example.refactoring._18_middle_man._38_remove_middle_man._before;
+
+public class Person {
+
+    private Department department;
+
+    private String name;
+
+    public Person(String name, Department department) {
+        this.name = name;
+        this.department = department;
+    }
+
+    public Person getManager() {
+        return this.department.getManager();
+    }
+}

refactoring/src/test/java/com/example/refactoring/_18_middle_man/_38_remove_middle_man/PersonTest.java

@@ -0,0 +1,16 @@
+package com.example.refactoring._18_middle_man._38_remove_middle_man;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PersonTest {
+
+    @Test
+    void getManager() {
+        Person kim = new Person("kim", null);
+        Person lee = new Person("lee", new Department(kim));
+        assertEquals(kim, lee.getDepartment().getManager());
+    }
+
+}