数字排列问题！1234567890组成四位数字0可以在首位排列出所有组合能列出来给我呢？大概一万多

Posted 2023-05-03

参考技术A 没有那么多，10*9*8*7=5040个。字数超出最大允许值，请删减！后面省略若干
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1978,1980,1982,1983,1984,1985,1986,1987,2013,2014,2015,2016,2017,2018,2019,2031,2034,2035,2036,2037,2038,2039,2041,2043,2045,2046,2047,2048,2049,2051,2053,2054,2056,2057,2058,2059,2061,2063,2064,2065,2067,2068,2069,2071,2073,2074,2075,2076,2078,2079,2081,2083,2084,2085,2086,2087,2089,2091,2093,2094,2095,2096,2097,2098,2103,2104,2105,2106,2107,2108,2109,2130,2134,2135,2136,2137,2138,2139,2140,2143,2145,2146,2147,2148,2149,2150,2153,2154,2156,2157,2158,2159,2160,2163,2164,2165,2167,2168,2169,2170,2173,2174,2175,2176,2178,2179,2180,2183,2184,2185,2186,2187,2189,2190,2193,2194,2195,2196,2197,2198,2301,2304,2305,2306,2307,2308,2309,2310,2314,2315,2316,2317,2318,2319,2340,2341,2345,2346,2347,2348,2349,2350,2351,2354,2356,2357,2358,2359,2360,2361,2364,2365,2367,2368,2369,2370,2371,2374,2375,2376,2378,2379,2380,2381,2384,2385,2386,2387,2389,2390,2391,2394,2395,2396,2397,2398,2401,2403,2405,2406,2407,2408,2409,2410,2413,2415,2416,2417,2418,2419,2430,2431,2435,2436,2437,2438,2439,2450,2451,2453,2456,2457,2458,2459,2460,2461,2463,2465,2467,2468,2469,2470,2471,2473,2475,2476,2478,2479,2480,2481,2483,2485,2486,2487,2489,2490,2491,2493,2495,2496,2497,2498,2501,2503,2504,2506,2507,2508,2509,2510,2513,2514,2516,2517,2518,2519,2530,2531,2534,2536,2537,2538,2539,2540,2541,2543,2546,2547,2548,2549,2560,2561,2563,2564,2567,2568,2569,2570,2571,2573,2574,2576,2578,2579,2580,2581,2583,2584,2586,2587,2589,2590,2591,2593,2594,2596,2597,2598,2601,2603,2604,2605,2607,2608,2609,2610,2613,2614,2615,2617,2618,2619,2630,2631,2634,2635,2637,2638,2639,2640,2641,2643,2645,2647,2648,2649,2650,2651,2653,2654,2657,2658,2659,2670,2671,2673,2674,2675,2678,2679,2680,2681,2683,2684,2685,2687,2689,2690,2691,2693,2694,2695,2697,2698,2701,2703,2704,2705,2706,2708,2709,2710,2713,2714,2715,2716,2718,2719,2730,2731,2734,2735,2736,2738,2739,2740,2741,2743,2745,2746,2748,2749,2750,2751,2753,2754,2756,2758,2759,2760,2761,2763,2764,2765,2768,2769,2780,2781,2783,2784,2785,2786,2789,2790,2791,2793,2794,2795,2796,2798,2801,2803,2804,2805,2806,2807,2809,2810,2813,2814,2815,2816,2817,2819,2830,2831,2834,2835,2836,2837,2839,2840,2841,2843,2845,2846,2847,2849,2850,2851,2853,2854,2856,2857,2859,2860,2861,2863,2864,2865,2867,2869,2870,2871,2873,2874,2875,2876,2879,2890,2891,2893,2894,2895,2896,2897,2901,2903,2904,2905,2906,2907,2908,2910,2913,2914,2915,2916,2917,2918,2930,2931,2934,2935,2936,2937,2938,2940,2941,2943,2945,2946,2947,2948,2950,2951,2953,2954,2956,2957,2958,2960,2961,2963,2964,2965,2967,2968,2970,2971,2973,2974,2975,2976,2978,2980,2981,2983,2984,2985,2986,2987,3012,3014,3015,3016,3017,3018,3019,3021,3024,3025,3026,3027,3028,3029,3041,3042,3045,3046,3047,3048,3049,3051,3052,3054,3056,3057,3058,3059,3061,3062,3064,3065,3067,3068,3069,3071,3072,3074,3075,3076,3078,3079,3081,3082,3084,3085,3086,3087,3089,3091,3092,3094,3095,3096,3097,3098,3102,3104,3105,3106,3107,3108,3109,3120,3124,3125,3126,3127,3128,3129,3140,3142,3145,3146,3147,3148,3149,3150,3152,3154,3156,3157,3158,3159,3160,3162,3164,3165,3167,3168,3169,3170,3172,3174,3175,3176,3178,3179,3180,3182,3184,3185,3186,3187,3189,3190,3192,3194,3195,3196,3197,3198,3201,... 参考技术B 就是0000-9999
一万个 参考技术C 1234234534564567567867897890890190120123

随机生成唯一的四位字符串-由大小写字母和数字组成

---法1：数据库方法
create or replace function FUNC_GEN_PAY_ID

 return CHAR
is
   v_param        varchar(1);--字符参数
   v_payid_param  varchar(4);--字符累加
   v_pay_id       varchar(4);--4位字符
   v_x            number;--循环的次数变量
   v_y            number;--是否生成 1：是  0：否
   v_rowCnt       number ;
begin
  --初始值
  v_x :=1;
  v_y :=1;
  v_payid_param :=‘‘;
  WHILE v_y =1 LOOP
    FOR v_x IN REVERSE 1 .. 4 LOOP
      select * into v_param from(
        select *
        from(
        select chr(ascii(‘A‘)+ROWNUM-1) S from dual connect by rownum<=26
        UNION  ALL
        select chr(ascii(‘a‘)+ROWNUM-1) S from dual connect by rownum<=26
        UNION  ALL
        select chr(ascii(‘0‘)+ROWNUM-1) S from dual connect by rownum<=10
        )ORDER BY dbms_random.value)
      where rownum<2;
      v_payid_param :=v_payid_param||v_param;
    END LOOP;
    SELECT COUNT(*)
    INTO v_rowCnt
    FROM DUAL
    WHERE EXISTS(
      SELECT 1
        FROM yst_pay_info
        WHERE  is_delete = ‘0‘
          AND  pay_id=v_payid_param);
    IF v_rowCnt = 1 THEN
      v_y :=1;
    ELSE
      v_pay_id :=v_payid_param;
      v_y :=0;
    END IF;
  END LOOP;
  return(v_pay_id);
end FUNC_GEN_PAY_ID;

 

--法2：Java方法(未校验是否唯一）

public class aa {

  /**
   * @param args
   */
  public static void main(String[] args) {
  
    System.out.println(get4Code());
  }
  public static  String get4Code(){
    StringBuffer sb = new StringBuffer();
    String codes ="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890";
    Random random = new Random();
    for(int i=0;i<codes.length();i++){
      char c = codes.charAt(random.nextInt(codes.length()));
      System.out.println(c);
      if(sb.length()==4) break;
      if(!sb.toString().contains(c+"")) sb.append(c);
    }
    return sb.toString();
  }

}