人事工號管理系統

import java.util.Scanner;

public class JobNumber {

    public static void main(String[] args) {

        int[] nums = new int[5];
        int d = -1;//下標
        Scanner scanner = new Scanner(System.in);

        while (true){
            //功能選擇
            System.out.println("請輸入選項： 1，新增工號；2，查詢工號；3，列印所有工號；4，退出");
            int x = scanner.nextInt();

            if (x == 4){
                break;
            }
            if(x == 1){
                System.out.println("請輸入需要新增工號！");
                int nu = scanner.nextInt();
                d++;
                //先判斷，不滿足條件先擴容
                if (d > nums.length-1){
                    int[] temp = new int[nums.length*3];
                    for (int i = 0; i < nums.length ; i++) {
                        temp[i] = nums[i];
                        nums = temp;
                    }
                }
                nums[d] = nu;
            }
            if (x == 2){
                System.out.println("請輸入需要查詢的工號");
                int nu = scanner.nextInt();
                int result = -1;
                for (int i = 0; i < nums.length; i++) {
                    if (nu == nums[i]){
                        result = i;
                        break;
                    }
                }
                System.out.println(result == -1 ?"您輸入的工號不存在！":"該工號存在為："+nums[result]);

            }
            if (x == 3){
                for (int i = 0; i <= d ; i++) {
                    System.out.println(nums[i]+" ");
                }
            }

        }

        }

    }