【C012037】public class NameList

{

    private List names = new ArrayList();

    public synchronized void add(String name)

    {

        names.add(name);

    }

    public synchronized void printAll()     {

        for (int i = 0; i < names.size(); i++)

        {

            System.out.print(names.get(i) + ””);

        }

    }

 

    public static void main(String[]args)

    {

        final NameList sl = new NameList();

        for (int i = 0; i < 2; i++)

        {

            new Thread()

            {

                public void run()

                {

                    sl.add(“A”);

                    sl.add(“B”);

                    sl.add(“C”);

                    sl.printAll();

                }

            } .start();

        }

    }

}

Which two statements are true if this class is compiled and run?

• A.An exception may be thrown at runtime.

• B.The code may run with no output, without exiting.

• C.The code may run with no output, exiting normally(正常地).

• D.The code may rum with output “A B A B C C “, then exit.

• E.The code may rum with output “A B C A B C A B C “, then exit.

• F.The code may ruin with output “A A A B C A B C C “, then exit.

• G.The code may ruin with output “A B C A A B C A B C “, then exit.