Array-T1/MahasiswaArray.java at main · MFAQIHF/Array-T1 · GitHub

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import java.util.Scanner;

public class MahasiswaArray {
    static int rows = 10;
    static String[][] students = new String[rows][2];
    static int count = 0;
    static Scanner input = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("\n=== MENU MAHASISWA ===");
            System.out.println("1. Insert at Beginning\n2. Insert Given Position\n3. Insert at End");
            System.out.println("4. Delete from Beginning\n5. Delete Given Position\n6. Delete from End");
            System.out.println("7. Delete First Occurrence\n8. Show Data\n9. Exit");
            System.out.print("Pilih Menu: ");

            int menu = input.nextInt();
            input.nextLine();

            if (menu == 1)
                insertBegn();
            else if (menu == 2)
                insertGiven();
            else if (menu == 3)
                insertEnd();
            else if (menu == 4)
                deltBegn();
            else if (menu == 5)
                deltGiven();
            else if (menu == 6)
                deltEnd();
            else if (menu == 7)
                deltFirstOccur();
            else if (menu == 8)
                display();
            else if (menu == 9)
                break;
        }
    }

    static void insertBegn() {
        for (int i = rows - 1; i > 0; i--) {
            students[i][0] = students[i - 1][0];
            students[i][1] = students[i - 1][1];
        }
        inputData(0);
        updateCount();
    }

    static void insertGiven() {
        System.out.print("Masukkan no baris tabel (1-10): ");
        int target = input.nextInt() - 1;
        input.nextLine();

        if (target >= 0 && target < rows) {
            for (int i = rows - 1; i > target; i--) {
                students[i][0] = students[i - 1][0];
                students[i][1] = students[i - 1][1];
            }
            inputData(target);
            updateCount();
        } else {
            System.out.println("Posisi tidak valid!");
        }
    }

    static void insertEnd() {
        for (int i = 0; i < rows - 1; i++) {
            students[i][0] = students[i + 1][0];
            students[i][1] = students[i + 1][1];
        }
        inputData(rows - 1);
        updateCount();
    }

    static void deltBegn() {
        for (int i = 0; i < rows - 1; i++) {
            students[i][0] = students[i + 1][0];
            students[i][1] = students[i + 1][1];
        }
        students[rows - 1][0] = null;
        students[rows - 1][1] = null;
        updateCount();
    }

    static void deltGiven() {
        System.out.print("Masukkan no baris tabel (1-10): ");
        int target = input.nextInt() - 1;
        input.nextLine();

        if (target >= 0 && target < rows) {
            for (int i = target; i < rows - 1; i++) {
                students[i][0] = students[i + 1][0];
                students[i][1] = students[i + 1][1];
            }
            students[rows - 1][0] = null;
            students[rows - 1][1] = null;
            updateCount();
        }
    }

    static void deltEnd() {
        students[rows - 1][0] = null;
        students[rows - 1][1] = null;
        updateCount();
    }

    static void deltFirstOccur() {
        System.out.print("Masukkan NIM Mahasiswa akan dihapus: ");
        String targetNim = input.nextLine();
        for (int i = 0; i < rows; i++) {
            if (students[i][1] != null && students[i][1].equals(targetNim)) {
                for (int j = i; j < rows - 1; j++) {
                    students[j][0] = students[j + 1][0];
                    students[j][1] = students[j + 1][1];
                }
                students[rows - 1][0] = null;
                students[rows - 1][1] = null;
                updateCount();
                System.out.println("Data berhasil dihapus!");
                return;
            }
        }
        System.out.println("Data Mahasiswa tidak ditemukan!");
    }

    static void updateCount() {
        count = 0;
        for (int i = 0; i < rows; i++) {
            if (students[i][1] != null)
                count++;
        }
    }

    static void inputData(int index) {
        System.out.print("Masukkan nama: ");
        students[index][0] = input.nextLine();
        System.out.print("Masukkan NIM: ");
        students[index][1] = input.nextLine();
    }

    static void display() {
        System.out.print("\nDalam Array: [");
        for (int i = 0; i < rows; i++) {
            String nama = (students[i][0] == null) ? "None" : students[i][0];
            String nim = (students[i][1] == null) ? "None" : students[i][1];
            System.out.print("[" + nama + ", " + nim + "]");
            if (i < rows - 1)
                System.out.print(", ");
        }
        System.out.println("]");
        System.out.println("Total count: " + count);
    }
}