Java 9에서 REPL의 다양한 상태는 무엇입니까?

import java.util.List;
import jdk.jshell.*;
import jdk.jshell.Snippet.Status;

public class JShellTest {
   public static void main(String args[]) {
      JShell shell = JShell.<strong>create()</strong>;
      <strong>List<SnippetEvent></strong> events = shell.<strong>eval</strong>("int a, b, sum; " + "a = 12; b = 11; sum = a + b; " +
                                             "System.out.println(sum);" );
      for(<strong>SnippetEvent </strong>event : events) {
         Snippet snippet = <strong>event.snippet()</strong>;
         <strong>Snippet.Status</strong> snippetstatus = shell.<strong>status</strong>(snippet);
         if(snippetstatus == <strong>Status.VALID</strong>) {
            System.out.println("Successfully executed");
         }
      }
   }
}

<strong>Successfully executed
Successfully executed
Successfully executed  </strong>