Java Hex Color Code Generator

Last week I got an ideas on a random color generator in Java. One of my friends asked me to implement this logic.

Here is my example hexadecimal color code generate logic.

public Map hexCodeGenerator(int colorCount){
  int maxColorValue = 16777215;
  // this is decimal value of the "FFFFFF"

  int devidedvalue = maxColorValue/colorCount;

  int countValue = 0;

  HashMap hexColorMap = new HashMap();

  for(int a=0; a < colorCount && maxColorValue >= countValue ; a++){
   if(a != 0){
    countValue+=devidedvalue;
    hexColorMap.put(a,Integer.toHexString( 0x10000 | countValue).substring(1).toUpperCase());

   }else{
    hexColorMap.put(a,Integer.toHexString( 0x10000 | countValue).substring(1).toUpperCase());
   }



  }
  return hexColorMap;

 }

Or You can use Math.random also. Here is example using Math.random

public static Map randomCodeGenerator(int colorCount){
  HashMap hexColorMap = new HashMap();
  for(int a=0;a < colorCount; a++){
   String code = ""+(int)(Math.random()*256);
   code = code+code+code;
   int  i = Integer.parseInt(code);

   
   hexColorMap.put(a,Integer.toHexString( 0x1000000 | i).substring(1).toUpperCase());
  }
 return hexColorMap;
 }

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