Set<Point> set = new HashSet<Point>();
Random position = new Random();
Point test=new Point();

do{
    test.x=position.nextInt(xx);
    test.y=position.nextInt(yy);
    //xx and yy are the random number limits called from another part of the code
    set.add(test);
}
while (set.size()<number);

List<Object> list = new ArrayList<Object>(set);
Object[] coord = list.toArray();

Set<Point> set = new HashSet<Point>();
Random position = new Random();
Point test;

do{
    test = new Point();
    test.x=position.nextInt(xx);
    test.y=position.nextInt(yy);
    //xx and yy are the random number limits called from another part of the code
    set.add(test);
}
while (set.size()<number);

List<Object> list = new ArrayList<Object>(set);
Object[] coord = list.toArray();

do{
   test = new Point();
   test.x=position.nextInt(xx);
   test.y=position.nextInt(yy);
   //xx and yy are the random number limits called from another part of the code
   set.add(test);
}
while (set.size()<number);

Random rndm = new Random();
    String[] selectedNumber = new String[15];
    String[] sequanceNumber = {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15"};

    //*****FIRST LOOP START*****//
    for(byte a = 0; a < 15;){

        int temp = rndm.nextInt(15)+1;

        //*****SECOND LOOP START*****//
        for(byte b = 0; b < 15; b++){

            String s4 = temp+"";

            //*****CHECKING CONDITION START*****//
            if(s4.equals(sequanceNumber[b]) ){


                selectedNumber[a] = s4;

                String s1 = sequanceNumber[b];
                s1 = s1.replace(s1, " ");
                sequanceNumber[b] = s1;

                a++;

            }
            //*****CHECKING CONDITION END*****//


        }
        //*****SECOND LOOP END*****//


    }
    //*****FIRST LOOP END*****//


    //*****PRINT ALL RANDOM VALUES BUT NOT REPEATED VALUES*****//
    System.out.println(Arrays.toString(selectedNumber));
    //*****FIRST LOOP START*****//
    for(byte a = 0; a < 15;){

        int temp = rndm.nextInt(15)+1;

        //*****SECOND LOOP START*****//
        for(byte b = 0; b < 15; b++){

            String s4 = temp+"";

            //*****CHECKING CONDITION START*****//
            if(s4.equals(sequanceNumber[b]) ){

                selectedNumber[a] = s4;
                String s1 = sequanceNumber[b];
                s1 = s1.replace(s1, " ");
                sequanceNumber[b] = s1;
                a++;

            }
            //*****CHECKING CONDITION END*****//
        }
        //*****SECOND LOOP END*****//
    }
    //*****FIRST LOOP END*****//


    //*****PRINT ALL RANDOM VALUES BUT NOT REPEATED VALUES*****//
    System.out.println(Arrays.toString(selectedNumber));