java- how to generate a random hexadecimal value within specified range of values

Question

I have a scenario in a java web app, where a random hexadecimal value has to be generated. This value should be within a range of values specified by me. (The range of value

Answer 1

Random progressive hex colors:

String letters[] = "0123456789ABCDEF".split("");
int min=letters.length-(letters.length/3);
int max=letters.length;
Random rnd=new Random(1000);
String colorEx[]= new String[]{"00","00","00"};
int colorChange=0;
int addColorChange=1;

private String getRandomColor() {
    StringBuilder color = new StringBuilder("#");
    int highColor=rnd.nextInt(2)+1;
    for (int i = 0; i<3; i++) {
        int addColor=0;
        if (i==highColor)
            highColor=min;

        color.append(colorEx[i]);

        if (colorChange==i) {
            if (colorEx[i].equals("00"))
                colorEx[i]="55";
            else if (colorEx[i].equals("55"))
                colorEx[i]="AA";
            else if (colorEx[i].equals("AA"))
                colorEx[i]="FF";
            else {
                if (i>0 && !"00".equals(colorEx[i-1]))
                    colorEx[i-1]="00";
                else if (i<2)
                    colorEx[i+1]="00";
                colorChange+=addColorChange;
                //colorChange++;
                if (colorChange>2 || colorChange<0) {
                    //colorChange=0;
                    addColorChange=-addColorChange;
                    colorChange+=addColorChange;
                    colorChange+=addColorChange;
                }
            }
        }
    }
    return color.toString();
}