1段階目（DB接続処理作成→全検索完成）完了しました。

.classpath

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="lib" path="lib/mysql-connector-java-8.0.23.jar"/>
-	<classpathentry kind="lib" path="実行例/DAO_Simple.jar"/>
-	<classpathentry kind="output" path="bin"/>
-</classpath>

.gitignore

@@ -1 +0,0 @@
-/bin/

.project

@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>em-jdbc</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.wst.validation.validationbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
-	</natures>
-</projectDescription>

.settings/.jsdtscope

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.JRE_CONTAINER"/>
-	<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.baseBrowserLibrary"/>
-	<classpathentry kind="src" path=""/>
-	<classpathentry kind="output" path=""/>
-</classpath>

.settings/org.eclipse.wst.jsdt.ui.superType.container

@@ -1 +0,0 @@
-org.eclipse.wst.jsdt.launching.JRE_CONTAINER

.settings/org.eclipse.wst.jsdt.ui.superType.name

@@ -1 +0,0 @@
-Global

src/com/rhizome/example/dao/EmployeeDAO.java

@@ -13,7 +13,6 @@ import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
 
-import com.rhizome.example.dto.EmployeeDTO;
 import com.rhizome.example.util.DbUtil;
 
 public class EmployeeDAO {
@@ -49,8 +48,8 @@ public class EmployeeDAO {
 	 * @throws SQLException
 	 * @throws ClassNotFoundException
 	 */
-	public List<EmployeeDTO> selectAll() throws SQLException, ClassNotFoundException {
+	public List<String> selectAll() throws SQLException, ClassNotFoundException {
-		List<EmployeeDTO> rtnList = new ArrayList<>();
+		List<String> rtnList = new ArrayList<>();
 		StringBuilder sql = new StringBuilder();
 		sql.append(" SELECT ");
 		sql.append("    " + "*");
@@ -61,15 +60,7 @@ public class EmployeeDAO {
 			this.stmt = con.prepareStatement(sql.toString());
 			rs = stmt.executeQuery();
 			while (rs.next()) {
-				//インスタンス生成
+				rtnList.add(rs.getString(NM_EMPLOYEE));
-				EmployeeDTO dto = new EmployeeDTO();
-				dto.setId_employee(rs.getInt("id_employee"));
-				dto.setNm_employee(rs.getString("nm_employee"));
-				dto.setKn_employee(rs.getString("kn_employee"));
-				dto.setMail_address(rs.getString("mail_address"));
-				dto.setPassword(rs.getString("password"));
-				dto.setId_department(rs.getInt("id_department"));
-				rtnList.add(dto);
 			}
 		} finally {
 			DbUtil.closeStatement(this.stmt);

src/com/rhizome/example/dto/EmployeeDTO.java

@@ -1,61 +0,0 @@
-package com.rhizome.example.dto;
-
-public class EmployeeDTO {
-	//フィールド宣言
-	private Integer id_employee;//社員ID
-	private String nm_employee;//社員名
-	private String kn_employee;//社員名カナ
-	private String mail_address;//メールアドレス
-	private String password;//パスワード
-	private Integer id_department;//部署ID
-
-	//getter/setter
-	public Integer getId_employee() {
-		return id_employee;
-	}
-
-	public void setId_employee(Integer id_employee) {
-		this.id_employee = id_employee;
-	}
-
-	public String getNm_employee() {
-		return nm_employee;
-	}
-
-	public void setNm_employee(String nm_employee) {
-		this.nm_employee = nm_employee;
-	}
-
-	public String getKn_employee() {
-		return kn_employee;
-	}
-
-	public void setKn_employee(String kn_employee) {
-		this.kn_employee = kn_employee;
-	}
-
-	public String getMail_address() {
-		return mail_address;
-	}
-
-	public void setMail_address(String mail_address) {
-		this.mail_address = mail_address;
-	}
-
-	public String getPassword() {
-		return password;
-	}
-
-	public void setPassword(String password) {
-		this.password = password;
-	}
-
-	public Integer getId_department() {
-		return id_department;
-	}
-
-	public void setId_department(Integer id_department) {
-		this.id_department = id_department;
-	}
-
-}

src/com/rhizome/example/main/Main.java

@@ -7,7 +7,6 @@ import java.util.List;
 import java.util.Scanner;
 
 import com.rhizome.example.dao.EmployeeDAO;
-import com.rhizome.example.dto.EmployeeDTO;
 import com.rhizome.example.util.DbUtil;
 
 /**
@@ -77,7 +76,7 @@ public class Main {
 	 * @throws SQLException
 	 */
 	public static void empSelect() throws ClassNotFoundException, SQLException {
-		List<EmployeeDTO> empList = new ArrayList<>();
+		List<String> empList = new ArrayList<>();
 		Connection con = DbUtil.getConnection();
 		EmployeeDAO empDao = new EmployeeDAO(con);
 		System.out.println("1:全検索 2:条件検索 それ以外:戻る");
@@ -90,7 +89,7 @@ public class Main {
 			default:
 				return;
 			}
-			for (EmployeeDTO emp : empList) {
+			for (String emp : empList) {
 				System.out.println(emp);
 			}
 		} finally {

src/com/rhizome/example/util/DbUtil.java

@@ -35,7 +35,7 @@ public class DbUtil {
 
 	/*
 	 * TODO 以下の仕様でメソッドを作成してください。
-	 *
+	 *1,2をやる
 	 * 戻り値		：Connection
 	 * メソッド名	：getConnection
 	 * 引数			：なし
@@ -52,34 +52,33 @@ public class DbUtil {
 
 	/*
 	 * TODO 以下の仕様でメソッドを作成してください。
-	 *
+	 *6をやる
 	 * 戻り値		：なし
 	 * メソッド名	：closeStatement
 	 * 引数			：DBステートメント(PreparedStatement型)
 	 * 例外			：SQLException
 	 * 処理			：引数のDBステートメントがnullでない場合、そのDBステートメントをクローズする
 	 */
-	public static void closeStatement(PreparedStatement stmt) throws SQLException {
+	public static void closeStatement(PreparedStatement ps) throws SQLException {
-		//nullチェック
+		if (ps != null) {
-		if (stmt != null) {
+			ps.close();
-			stmt.close();
 		}
+
 	}
 
 	/*
 	 * TODO 以下の仕様でメソッドを作成してください。
-	 *
+	 *7
 	 * 戻り値		：なし
 	 * メソッド名	：closeConnection()
 	 * 引数			：切断するコネクション(Connection型)
 	 * 例外			：SQLException
 	 * 処理			：引数のコネクションがnullでない場合、そのコネクションを切断する
 	 */
-	public static void closeConnection(Connection con) throws SQLException {
+	public static void closeConnection(Connection co) throws SQLException {
-		//nullチェック
+		if (co != null) {
-		if (con != null) {
+			co.close();
-			con.close();
+		}
 
 	}
-	}
 }