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生成4位验证码,从大写字母,小写字母,数字中生成...

从A-Z及 a-z和0-9的字符串中,挑选4个不重复的 ,,,,这个不算太难了 ~

是每一个验证码都要包含数字和字母还是可以有纯数字或纯字母 可以随机生成一个数字通过一个表得到相应的字符 然后再输出 如果自己不想写代码的话3到5元我可代劳

会产生26位大写字母和数字吧,连接的话 char a='a'; int b=1; String c=Character.toString(a)+Integer.toString(b);//包装类的tostring String d=String.valueOf(a)+String.valueOf(b);//String的api System.out.println(c); System.out.printl...

import java.util.Random;public class Test {public static void main(String[] args) {char c = 'i';StringBuffer sb = new StringBuffer();for (int i = 0; i < 6; i++) {int a = Math.abs((new Random()).nextInt(57));// 产生0~57的随机数i...

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace RandomStringDemo{class Program{static void Main(string[] args){string chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrst...

Private Sub Command1_Click()Dim s As StringDim x As Stringx = ""s = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"For i = 1 To 6 Randomize x = x & Mid(s, Int(Rnd * Len(s) + 1), 1)NextText1.Text = xEnd Sub

var code=GetCode(4);//随机获取4个数private string GetCode(int num)//获取随机数 { string AllCode = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z"; stri...

Private Sub Command1_Click() Dim strIn As String, I As Integer, T As String, strOut As String strIn = InputBox("请输入字符串:") For I = 1 To Len(strIn) T = Mid(strIn, I, 1) If T >= "A" And T

public class GenerateRandomLetterAndNum { public static void main(String[] args) { Set store = getletterandnum(6); printSet(store); } public static Set getletterandnum(int length) { Set set =new HashSet(); for (int i = 0; i < l...

keep_words=['and','as','assert','break','class','continue', 'def','del','elif','else','except','finally', 'for','from','global','if','import','in','is', 'lambda','nonlocal','not','or','pass','raise', 'return','try','while','tim...

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