refactoring : divergent change - extract class

refactoring/src/main/java/com/example/refactoring/_07_divergent_change/_26_extract_class/Person.java

@@ -0,0 +1,28 @@
+package com.example.refactoring._07_divergent_change._26_extract_class;
+
+public class Person {
+
+    private final TelephoneNumber telephoneNumber;
+    private String name;
+
+    public Person(TelephoneNumber telephoneNumber, String name) {
+        this.telephoneNumber = telephoneNumber;
+        this.name = name;
+    }
+
+    public String telephoneNumber() {
+        return this.telephoneNumber.toString();
+    }
+
+    public String name() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public TelephoneNumber getTelephoneNumber() {
+        return telephoneNumber;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_07_divergent_change/_26_extract_class/TelephoneNumber.java

@@ -0,0 +1,32 @@
+package com.example.refactoring._07_divergent_change._26_extract_class;
+
+public class TelephoneNumber {
+    private String areaCode;
+    private String number;
+
+    public TelephoneNumber(String areaCode, String officeNumber) {
+        this.areaCode = areaCode;
+        this.number = officeNumber;
+    }
+
+    public String getAreaCode() {
+        return areaCode;
+    }
+
+    public void setAreaCode(String areaCode) {
+        this.areaCode = areaCode;
+    }
+
+    public String getNumber() {
+        return number;
+    }
+
+    public void setNumber(String number) {
+        this.number = number;
+    }
+
+    @Override
+    public String toString() {
+        return this.areaCode + " " + this.number;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_07_divergent_change/_26_extract_class/_before/Person.java

@@ -0,0 +1,38 @@
+package com.example.refactoring._07_divergent_change._26_extract_class._before;
+
+public class Person {
+
+    private String name;
+
+    private String officeAreaCode;
+
+    private String officeNumber;
+
+    public String telephoneNumber() {
+        return this.officeAreaCode + " " + this.officeNumber;
+    }
+
+    public String name() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String officeAreaCode() {
+        return officeAreaCode;
+    }
+
+    public void setOfficeAreaCode(String officeAreaCode) {
+        this.officeAreaCode = officeAreaCode;
+    }
+
+    public String officeNumber() {
+        return officeNumber;
+    }
+
+    public void setOfficeNumber(String officeNumber) {
+        this.officeNumber = officeNumber;
+    }
+}