提出物です

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

@@ -61,7 +61,6 @@ public class EmployeeDAO {
 			this.stmt = con.prepareStatement(sql.toString());
 			rs = stmt.executeQuery();
 			while (rs.next()) {
-				//インスタンス生成
 				EmployeeDTO dto = new EmployeeDTO();
 				dto.setId_employee(rs.getInt("id_employee"));
 				dto.setNm_employee(rs.getString("nm_employee"));
@@ -72,9 +71,37 @@ public class EmployeeDAO {
 				rtnList.add(dto);
 			}
 		} finally {
-			DbUtil.closeStatement(this.stmt);
+			DbUtil.closestatement(this.stmt);
 		}
 		return rtnList;
 	}
 
+	public List<EmployeeDTO> selectById(int id_employee) throws SQLException, ClassNotFoundException {
+		List<EmployeeDTO> rtnList2 = new ArrayList<>();
+		StringBuilder sql = new StringBuilder();
+		sql.append(" SELECT ");
+		sql.append("    " + "*");
+		sql.append(" FROM ");
+		sql.append("    " + TBL_NAME);
+		sql.append(" WHERE " + ID_EMPLOYEE+ "=?");
+		try {
+
+			this.stmt = con.prepareStatement(sql.toString());
+			rs = stmt.executeQuery();
+			while (rs.next()) {
+				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"));
+				rtnList2.add(dto);
+			}
+		} finally {
+			DbUtil.closestatement(this.stmt);
+		}
+		return rtnList2;
+	}
+
 }

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

@@ -1,15 +1,14 @@
 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
+	private Integer id_employee;
+	private String nm_employee;
+	private String kn_employee;
+	private String mail_address;
+	private String password;
+	private Integer id_department;
+
 	public Integer getId_employee() {
 		return id_employee;
 	}
@@ -58,4 +57,13 @@ public class EmployeeDTO {
 		this.id_department = id_department;
 	}
 
+	public String toString() {
+		return id_employee + "\t"
+				+ nm_employee + "\t"
+				+ kn_employee + "\t"
+				+ mail_address + "\t"
+				+ password + "\t"
+				+ id_department;
+
+	}
 }

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

@@ -87,6 +87,11 @@ public class Main {
 			case "1":
 				empList = empDao.selectAll();
 				break;
+			case "2":
+				System.out.println("IDを入力してください");
+				
+				empList = empDao.selectById(tblFlg);
+				break;
 			default:
 				return;
 			}

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

@@ -45,7 +45,7 @@ public class DbUtil {
 	 * 				  ※Connection生成には上記の定数を活用してください
 	 */
 	public static Connection getConnection() throws SQLException {
-		//データベースへの接続
+		//データベースの接続
 		con = DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
 		return con;
 	}
@@ -59,9 +59,10 @@ public class DbUtil {
 	 * 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 {
+
-		//nullチェック
+	public static void closestatement(PreparedStatement stmt) throws SQLException {
-		if (stmt != null) {
+		if (!stmt.equals(null)) {
+			//DBステートメントを閉じる
 			stmt.close();
 		}
 	}
@@ -76,10 +77,8 @@ public class DbUtil {
 	 * 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 {
-		//nullチェック
+		if (!con.equals(null)) {
-		if (con != null) {
 			con.close();
-
 		}
 	}
 }