4段階目（BaseDataを作り、EmployeeDataに継承させよう）

em-oop/src/BaseData.java

@@ -0,0 +1,8 @@
+
+public abstract class BaseData {
+	public abstract String toString();
+
+	public abstract String toCSV();
+
+	public abstract String getPrimaryKeyValue();
+}

em-oop/src/EmployeeData.java

@@ -1,5 +1,5 @@
 
-public class EmployeeData {
+public class EmployeeData extends BaseData {
 	private String idEmployee;
 	private String nmEmployee;
 	private String knEmployee;
@@ -112,4 +112,15 @@ public class EmployeeData {
 		return true;
 	}
 
+	@Override
+	public String toCSV() {
+		return getIdEmployee() + "," + getNmEmployee() + "," + getKnEmployee() + ","
+				+ getMailAddress() + "," + getPassword() + "," + getIdDepartment();
+	}
+
+	@Override
+	public String getPrimaryKeyValue() {
+		return this.idEmployee;
+	}
+
 }

em-oop/src/Main.java

@@ -4,11 +4,12 @@ public class Main {
 	public static void main(String[] args) {
 		System.out.println("会社名:" + EmployeeData.COMPANY_NAME);
 
-		//		EmployeeData employee = new EmployeeData("10000", "山田龍也", "ヤマダタツヤ",
-		//				"yamada@hoge.jp", "aaa", "10");
-		//		System.out.println(employee);
-		//
-		//		System.out.println();
+		EmployeeData employee = new EmployeeData("10000", "山田龍也", "ヤマダタツヤ",
+				"yamada@hoge.jp", "aaa", "10");
+		System.out.println(employee.toCSV());
+		System.out.println(employee.getPrimaryKeyValue());
+
+		System.out.println();
 
 		EmployeeData[] employees = new EmployeeData[5];
 		for (int i = 0; i < employees.length; i++) {