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public class PrimeRunner{    // Get a number    // Display all the primes up to that number}public class PrimeGenerator{    public int NextPrime()    {        // Display the next prime number    }}==========================public class PrimeRunner{    System.out.print("Maximum? ");    int max = in.nextInt();        prime = pg.nextPrime()    while (prime <= max)    {        System.out.println(prime)        prime = pg.nextPrime()    }}public class PrimeGenerator{    int currentNumber = 0    public int NextPrime()    {        // Keep increasing currentNumber until it is prime        return currentNumber    }}==========================// And so on...