refactoring : method chain - hide delegate

refactoring/src/main/java/com/example/refactoring/_17_method_chains/_37_hide_delegate/Department.java

@@ -0,0 +1,21 @@
+package com.example.refactoring._17_method_chains._37_hide_delegate;
+
+public class Department {
+
+    private String chargeCode;
+
+    private Person manager;
+
+    public Department(String chargeCode, Person manager) {
+        this.chargeCode = chargeCode;
+        this.manager = manager;
+    }
+
+    public String getChargeCode() {
+        return chargeCode;
+    }
+
+    public Person getManager() {
+        return manager;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_17_method_chains/_37_hide_delegate/Person.java

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+package com.example.refactoring._17_method_chains._37_hide_delegate;
+
+public class Person {
+
+    private String name;
+
+    private Department department;
+
+    public Person(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Department getDepartment() {
+        return department;
+    }
+
+    public void setDepartment(Department department) {
+        this.department = department;
+    }
+
+    Person getManager() {
+        return getDepartment().getManager();
+    }
+}

refactoring/src/main/java/com/example/refactoring/_17_method_chains/_37_hide_delegate/_before/Department.java

@@ -0,0 +1,21 @@
+package com.example.refactoring._17_method_chains._37_hide_delegate._before;
+
+public class Department {
+
+    private String chargeCode;
+
+    private Person manager;
+
+    public Department(String chargeCode, Person manager) {
+        this.chargeCode = chargeCode;
+        this.manager = manager;
+    }
+
+    public String getChargeCode() {
+        return chargeCode;
+    }
+
+    public Person getManager() {
+        return manager;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_17_method_chains/_37_hide_delegate/_before/Person.java

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+package com.example.refactoring._17_method_chains._37_hide_delegate._before;
+
+public class Person {
+
+    private String name;
+
+    private Department department;
+
+    public Person(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Department getDepartment() {
+        return department;
+    }
+
+    public void setDepartment(Department department) {
+        this.department = department;
+    }
+}

refactoring/src/test/java/com/example/refactoring/_17_method_chains/_37_hide_delegate/PersonTest.java

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+package com.example.refactoring._17_method_chains._37_hide_delegate;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PersonTest {
+
+    @Test
+    void manager() {
+        Person kim = new Person("kim");
+        Person nick = new Person("nick");
+        kim.setDepartment(new Department("m365deploy", nick));
+
+        Person manager = kim.getManager();
+        assertEquals(nick, manager);
+    }
+
+}