How To Generate Random String Without Duplicate Values In Java Android

By Anonymous -
Random string is needed when testing some variable in java. Random String without duplicate values will help vaeriable more valid while testing. This code below will string and put them in TextView widget.

   public static String getRandomString(int length) {  
     StringBuilder result = new StringBuilder();  
     String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";  
     Random rand = new Random();  
     while(length > 0) {  
       String h = String.valueOf(characters.charAt(rand.nextInt(characters.length())));  
       if(!result.toString().contains(h)){  
            result.append(h);  
            length--;  
       }  
       Log.d ("yy",characters);  
     }  
     return result.toString();  
    }

This java code below is how to use that function

     textView.setText(getRandomString(20));

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