public class Assertions2 {
    public static int threeHeads(Random rand) {
        int flip = 1;
        int heads = 0;
        int count = 0;
        // Point A
        while (heads < 3) {
            // Point B
            flip = rand.nextInt(2); // flip coin
            if (flip == 0) { // heads
                heads++;
                // Point C
            } else {
                // Point D
                heads = 0;
            }
            count++;
        }
        // Point E
        return count;
    }
}       

/*          flip == 0   heads == 0  flip > heads
Point A     N           A           A       
Point B     S           S           S
Point C     A           N           N
Point D     N           S           S
Point E     A           N           N
*/