单项选择题
A.Compilation fails.
B.An exception is thrown at runtime.
C.The code executes normally and prints "sleep".
D.The code executes normally， but nothing is printed.
单项选择题 What is the result？（）
多项选择题 Which two statements are true？（）
单项选择题 Given：fooandbararepublicreferencesavailabletomanyotherthreads，fooreferstoaThreadandbarisanObject.Thethreadfooiscurrentlyexecutingbar.wait（）.Fromanotherthread，whatprovidesthemostreliablewaytoensurethatfoowillstopexecutingwait（）？（）
