Method test

validating/GuavaPreconditions.java:10–21

(Consumer<String> c, String s)

public class GuavaPreconditions {
  static void test(Consumer<String> c, String s) {
    try {
      System.out.println(s);
      c.accept(s);
      System.out.println("Success");
    } catch(Exception e) {
      String type = e.getClass().getSimpleName();
      String msg = e.getMessage();
      System.out.println(type +
        (msg == null ? "" : ": " + msg));
    }
  }
  public static void main(String[] args) {
    test(s -> s = checkNotNull(s), "X");
    test(s -> s = checkNotNull(s), null);