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import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;
 
class Hello {
  public static int[] primesTo(int limit) {
    boolean[] sieve = new boolean[limit + 1];
    Arrays.fill(sieve, true);
 
    for(int p = 3; p <= Math.sqrt(limit); p += 2)
      if(sieve[p])
        for(int i = 3; i <= limit / p; i += 2)
          sieve[p * i] = false;
 
    List<Integer> primes = new ArrayList<Integer>(limit / 2);
    primes.add(2);
    for(int i = 3; i <= limit; i += 2)
      if(sieve[i])
        primes.add(i);
 
    return (int[])primes.toArray(new int[primes.size()]);
  }
}

Main.java:21: error: no suitable method found for toArray(int[])
    return (int[])primes.toArray(new int[primes.size()]);
                        ^
    method List.<T>toArray(T[]) is not applicable
      (inferred type does not conform to declared bound(s)
        inferred: int
        bound(s): Object)
    method List.toArray() is not applicable
      (actual and formal argument lists differ in length)
  where T is a type-variable:
    T extends Object declared in method <T>toArray(T[])
1 error

Standard output is empty