Afoo Afoo
Afoo Bfoo
Bfoo Afoo
Bfoo Bfoo
Compilation fails
第1题：
collie
harrier
Compilation fails.
collie harrier
An exception is thrown at runtime.
第2题：
test
Exception
Compilation fails.
NullPointerException
第3题：
A.00
B.0001
C.000120
D.00012021
E.Compilation fails.
F.An exception is thrown at runtime.
第4题：
Compilation succeeds.
Compilation fails due to multiple errors.
Compilation fails due to an error only on line 20.
Compilation fails due to an error only on line 21.
Compilation fails due to an error only on line 22.
第5题：
Compilation fails.
An exception is thrown at runtime.
The code executes normally and prints "sleep".
The code executes normally， but nothing is printed.
第6题：
r， t， t，
r， e， o，
Compilation fails.
An exception is thrown at runtime.
第7题：
2
3
12
23
123
Compilation fails.
An exception is thrown at runtime.
第8题：
A.True
B.Not true
C.An exception is thrown at runtime.
D.Compilation fails because of an error at line 12.
E.Compilation fails because of an error at line 19.
第9题：
2
24
234
246
2346
Compilation fails.
第10题：
test
null
An exception is thrown at runtime.
Compilation fails because of an error in line 1.
Compilation fails because of an error in line 4.
Compilation fails because of an error in line 5.