ファイルからの読み取り、ArrayList、StreamAPIの使用練習

2026-09-17 16:20:52 +09:00
parent 1bbc548980
commit b254050ce8
3 changed files with 176 additions and 0 deletions
--- a/em-oop/src/Sub.java
+++ b/em-oop/src/Sub.java
@@ -0,0 +1,165 @@
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class Sub {
+
+	public static void main(String[] args) {
+		final String employeesCSVPath = "employees.csv";
+		final String departmentsCSVPath = "departments.csv";
+
+		ArrayList<BaseData> employees = new ArrayList<BaseData>();
+		ArrayList<BaseData> departments = new ArrayList<BaseData>();
+
+		//社員CSVの読み込み
+		Path pathEmp = Path.of(employeesCSVPath);
+		ArrayList<String> content = new ArrayList<String>();
+		try {
+			//			content = Files.readString(path);
+			content = (ArrayList<String>) (Files.readAllLines(pathEmp));
+		} catch (IOException e) {
+			// TODO 自動	生成された catch ブロック
+			e.printStackTrace();
+		}
+		content.stream().forEach(data -> {
+
+			ArrayList<String> content2 = new ArrayList<String>(Arrays.asList(data.split(",")));
+			employees.add(
+					new EmployeeData(content2.get(0), content2.get(1), content2.get(2), content2.get(3),
+							content2.get(4), content2.get(5)));
+		});
+
+		//部門CSVの読み込み
+		content.clear();//使いまわしたいから
+
+		Path pathDept = Path.of(departmentsCSVPath);
+
+		try {
+			//			content = Files.readString(path);
+			content = (ArrayList<String>) (Files.readAllLines(pathDept));
+		} catch (IOException e) {
+			// TODO 自動	生成された catch ブロック
+			e.printStackTrace();
+		}
+		content.stream().forEach(data -> {
+
+			ArrayList<String> content2 = new ArrayList<String>(Arrays.asList(data.split(",")));
+			employees.add(
+					new DepartmentData(content2.get(0), content2.get(1)));
+		});
+
+		ArrayList<BaseData> allData = new ArrayList<BaseData>();
+		allData.addAll(employees);
+		allData.addAll(departments);
+
+		//intを配列にしたらエラーが出なかった　理由不明
+		int employeeCount = 0;
+		int deptCount = 0;
+		int[] counter = { 0, 0 };
+
+		allData.stream().forEach(data -> {
+			System.out.println(data); //一覧表示
+			if (data instanceof EmployeeData) {
+				counter[0]++;
+			} else if (data instanceof DepartmentData) {
+				counter[1]++;
+			}
+
+		});
+
+		System.out.println("社員データ:" + counter[0] + "件\n部署データ:" + counter[1] + "件");
+		System.out.println();
+
+		//検索
+		Scanner scanner = new Scanner(System.in);
+		while (true) {
+			System.out.println("検索したい項目を入力してください\n社員ID:1　部署名:2　終了:0");
+			System.out.print(">>>>");
+			String str = scanner.nextLine().strip();
+			switch (str) {
+			case "1":
+				EmployeeSeach(allData);
+				break;
+			case "2":
+				DepartmentSearch(allData);
+				break;
+			case "0":
+				System.out.println("システムを終了します");
+				return;
+			default:
+				break;
+			}
+
+		}
+	}
+
+	private static void DepartmentSearch(ArrayList<BaseData> allData) {
+		Scanner scanner = new Scanner(System.in);
+		while (true) {
+			System.out.println("検索したい部署名を入力してください（戻る場合は0）");
+			System.out.print(">>>>");
+			String str = scanner.nextLine().strip();
+			String searchDeptId = "";
+			switch (str) {
+			case "0":
+				System.out.println("検索一覧に戻ります\n");
+				return;
+			default:
+				for (BaseData data : allData) {
+					if (data instanceof DepartmentData) {
+						if (((DepartmentData) data).getNmDepartment().equals(str)) {
+							searchDeptId = ((DepartmentData) data).getIdDepartment();
+						}
+					}
+				}
+				if (searchDeptId.equals("")) {
+					System.out.println("該当する部署が見つかりませんでした\n");
+					continue;
+				}
+				for (BaseData data : allData) {
+					if (data instanceof EmployeeData) {
+						if (((EmployeeData) data).getIdDepartment().equals(searchDeptId)) {
+							System.out.println(
+									((EmployeeData) data).getNmEmployee() + "\t"
+											+ ((EmployeeData) data).getMailAddress());
+						}
+					}
+				}
+				System.out.println();
+				break;
+			}
+		}
+	}
+
+	private static void EmployeeSeach(ArrayList<BaseData> allData) {
+		Scanner scanner = new Scanner(System.in);
+		while (true) {
+			System.out.println("検索したい社員IDを入力してください（戻る場合は0）");
+			System.out.print(">>>>");
+			String str = scanner.nextLine().strip();
+			boolean matchFlag = false;
+			switch (str) {
+			case "0":
+				System.out.println("検索一覧に戻ります\n");
+				return;
+			default:
+				for (BaseData e : allData) {
+					if (e.getPrimaryKeyValue().equals(str)) {
+						System.out.println(e);
+						matchFlag = true;
+						break;
+					}
+				}
+				if (!matchFlag) {
+					System.out.println("該当する社員が見つかりませんでした");
+				}
+				System.out.println();
+				break;
+
+			}
+		}
+	}
+}