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import java.io.PrintStream;
import java.util.ArrayList;
public class PrimeGen {
private ArrayList<Integer> primes;
private int at;
public PrimeGen() {
this.primes = new ArrayList<>();
this.at = 1;
}
public int next(int limit) {
// Run until a prime
primeloop:
while (true) {
this.at++;
if (this.at >= limit) {
return -1;
}
for (int prime : this.primes) {
if (this.at % prime == 0) {
continue primeloop;
}
}
break;
}
this.primes.add(at);
return at;
}
public int next() {
return next(-1);
}
}
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