java - Testing string for ascending order -

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I have written a piece of code here to generate a random pin number of a specific length. This code works fine, but I want to add an exception where the pin ends in ascending order. For example, if a PIN is expired, 1234, 3456, 4567 will become invalid pins. 

  public static string generation (int nmrpinidit) {string pin = new string (); NUMBER_PIN_DIGITS = NmR pin dygets; For (int i = 0; i    
 
 
 edit  
 Actually the question of OP is probably To know more about what a pin is in a sequence:  
  char prev = pin.charAt (0); For (four f: pins. Substring (1) .to carrier ()) {if (chr - prev! = 1) {// No sequence return false; } Prev = chr; } // is a sequence! Back true;  
 
 goes to the same order, just a test value as a  -1 .

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