String a ="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; System.out.print("验证码"); for (int i=0;i<4;i++) { Random r = new Random(); int b=r.nextInt(62); System.out.print(a.substring(b,b+1)+" "); }
String a ="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; System.out.print("验证码"); for (int i=0;i<4;i++) { Random r = new Random(); int b=r.nextInt(62); System.out.print(a.substring(b,b+1)+" "); }