问题：

[多选]

import java.util.*； 
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 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 ruin（） { 
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 rum with output “A B A B C C “， then exit.
D . The code may ruin with output “A A A B C 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 B C A A B C A B C “， then exit.