Java does still include some boilerplate for setting up classes — though that may go away in 10 when they add scripting. However, it is a lot more terse than in 7:

  package com.shekhargulati.ninetynine_problems._02_arithmetic;

  import java.util.stream.LongStream;

  /**
   * (**) Determine whether a given integer number is prime.
   */
  public class P31 {

    public static boolean isPrime(long number) {
        return !LongStream.rangeClosed(2, Math.round(Math.sqrt(number))).anyMatch(n -> number % n == 0);
    }
  }