Java generates a 6-bit random string containing letters and numbers _java

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Package com.amos.tools;
Import java.util.ArrayList;
Import java.util.List;
 
Import Java.util.Random;
    public class Invertcodegenerator {public static void main (string[] args) {//TODO auto-generated stub
    List<string> results=gencodes (6,100);
  System.out.println (Results.size ()); public static list<string> gencodes (int length,long num) {list<string> results=new ARRAYLIST&L T
     
    String> ();   
           
      for (int j=0;j<num;j++) {String val = "";   
      Random Random = new Random (); for (int i = 0; i < length; i++) {String charornum = random.nextint (2)% 2 = 0? "Char": "num"; Output letter or number if ("Char". Equalsignorecase (Charornum))//String {int choice = Random.nextint (2)% 2 = 0? 65:97;   
        Gets the uppercase or lowercase letter val + = (char) (Choice + random.nextint (26));  else if ("num". Equalsignorecase (Charornum))//number 
        {val = string.valueof (Random.nextint (10));
      } val=val.tolowercase ();
      if (Results.contains (val)) {continue;
      }else{Results.add (Val);
           
        
    } return results;

 }  
   
 
}

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