C6X7_PrimeGen.java

//PrimeGen.java     MrG 2012.0113
public class PrimeGen
{
    private int current;

    public PrimeGen()
    {
        current = 1;
    }

    public int nextPrime()
    {
        do
        {
            current++;
        }
        while(!isPrime());
        return current;
    }

    private boolean isPrime()
    {
        if(current<2){return false;}
        if(current==2){return true;}
        if(current%2==0){return false;}
        for(int i=3; i*i<=current; i+=2)
        {
            if(current%i==0){return false;}
        }
        return true;
    }
}