java.util.Queue

java.util.ArrayList

java.util.LinearList

java.util.LinkedList

process（bytes）；

BitUtils.process（bytes）；

util.BitUtils.process（bytes）；

SomeApp cannot use methods in BitUtils.

import util.BitUtils.*； process（bytes）；

assert value == null；

assert value != null， "value is null"；

if （value == null） { throw new AssertionException（"value is null"）； }

if （value == null） { throw new IllegalArgumentException（"value is null"）； }

3，2，1

1，2，3

Compilation fails.

The code runs with no output.

An exception is thrown at runtime.

12

The code runs with no output.

An exception is thrown at runtime.

Compilation fails because of an error in line 21.

Compilation fails because of an error in line 22.

Compilation fails because of an error in line 31.

420 is the output.

An exception is thrown at runtime.

All constructors must be declared public.

Constructors CANNOT use the private modifier.

Constructors CANNOT use the protected modifier.

13

134

1234

2134

Compilation fails.

Nothing is added to the file system.

Only a new file is created on the file system.

Only a new directory is created on the file system.

Both a new file and a new directory are created on the file system.

The value "4" is printed at the command line.

Compilation fails because of an error in line 5.

Compilation fails because of an error in line 9.

A NullPointerException occurs at runtime.

A NumberFormatException occurs at runtime.

An IllegalStateException occurs at runtime.