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電訊盈科ARM嵌入式系統(tǒng)開發(fā)與應(yīng)用招聘試題PCCW
Solutions
Junior
Developer
Testing
Exam
姓名_________專業(yè)________________學(xué)校______________成績____
Part
I：Core
Java
1)
Given:
1.
public
class
Test
{
2.
public
static
void
main(String
args[])
{
3.
class
TestInner
{
4.
public
int
i
=
3;
5.
}
6.
Object
o
=
new
TestInner
();
7.
TestInner
ti
=
(TestInner)o;
8.
System.out.println(“i
=
“
+
ti.i);
9.
}
10.
}
What
is
the
result?
A.
i
=
3
;
B.
Compilation
fails.
C.
A
ClassCastException
is
thrown
at
line
6.
D.
A
ClassCastException
is
thrown
at
line
7.
2)
Given:
11.
int
i
=
1,j
=
10;
12.
do
{
13.
if(i>j)
{
14.
break;
15.
}
16.
j--;
17.
}
while
(++i
<5);
18.
System.out.println(“i
=”
+i+”
and
j
=
“+j);
What
is
the
result?
A.
i
=
6
and
j
=
5
B.
i
=
5
and
j
=
5
C.
i
=
6
and
j
=
4
D.
i
=
5
and
j
=
6
E.
i
=
6
and
j
=
6
3)
Given:
1.
public
interface
Foo
{
2.
int
k
=
4;
3.
}
Which
three
are
equivalent
to
line
2?
(Choose
three)
A.
final
int
k
=
4;
B.
public
int
k
=
4;
C.
static
int
k
=
4;
D.
abstract
int
k
=
4;
E.
volatile
int
k
=
4;
F.
protected
int
k
=
4;
4)
Given:
1.
package
test1;
2.
public
class
Test1
{
3.
static
int
x
=
42;
4.
}
1.
package
test2;
2.
public
class
Test2
extends
test1.Test1
{
3.
public
static
void
main(String[]
args)
{
4.
System.out.println(“x
=
“
+
x);
5.
}
6.
}
What
is
the
result?
A.
x
=
0
B.
x
=
42
C.
Compilation
fails
because
of
an
error
in
line
2
of
class
Test2.
D.
Compilation
fails
because
of
an
error
in
line
3
of
class
Test1.
E.
Compilation
fails
because
of
an
error
in
line
4
of
class
Test2.
5)
Given:
class
A
{
protected
int
method1(int
a,
int
b)
{
return
0;
}
}
Which
two
are
valid
in
a
class
that
extends
class
A?
(Choose
two)
A.
public
int
method1(int
a,
int
b)
{
return
0;
}
B.
private
int
method1(int
a,
int
b)
{
return
0;
}
C.
private
int
method1(int
a,
long
b)
{
return
0;
}
D.
public
short
method1(int
a,
int
b)
{
return
0:
}
E.
static
protected
int
method1(int
a,
int
b)
{
return
0;
}
6)
Given:
1.
class
TestSuper
{
2.
TestSuper(int
i)
{
}
3.
}
4.
class
TestSub
extends
TestSuper{
}
5.
class
TestAll
{
6.
public
static
void
main
(String
[]
args)
{
7.
new
TestSub();
8.
}
9.
}
Which
is
true?
A.
Compilation
fails.
B.
The
code
runs
without
exception.
C.
An
exception
is
thrown
at
line
7.
D.
An
exception
is
thrown
at
line
2.
7)
Given:
Thread
Z
holds
the
lock
on
object
A.
Thread
X
is
blocked
inside
a
wait
call
on
ObjectA.
What
allows
thread
X
to
become
runnable?
A.
Thread
X
is
interrupted.
B.
Thread
X
is
interrupted.
C.
Thread
X’s
wait()
times
out.
D.
Thread
Z
calls
Thread.sleep(100);
E.
Thread
Z
releases
the
lock
on
A
and
calls
the
notify()
method
on
thread
X.
F.
Thread
Z
releases
the
lock
on
A
and
calls
the
notifyAll()
method
on
objectA.
8)
Given:
11.
ArraryList
a
=
new
ArrayList();
12.
a.add(“Alpha”);
13.
a.add(“Bravo”):
14.
a.add(“Charlie”);
15.
a.add(“Delta”);
16.Iterator
iter
=
a.iterator();
17.
Which
two,
added
at
line
17,
the
names
in
the
ArrayList
in
alphabetical
order?
(Choose
two)
A.
for
(int
i=0;
i<
a.size();
i++)
System.out.println(a.get(i)));
B.
for
(int
i=0;
i<
a.size();
i++)
System.out.println(a[i]);
C.
while(
iter.hasNext()
)
System.out.println(iter.next())
D.
for
(int
i=0,
i<
a.size();
i++)
System.out.println(iter[i]);
E.
for
(int
i=0;
i<
a.size();
i++)
System.out.println(iter.get(i));
9)
Given:
11.
String
a
=
“ABCD”;
12.
String
b
=
a.toLowerCase();
13.
b.replace(‘a(chǎn)’,
‘d’);
14.
b.replace(‘b’,
‘c’);
15.
System.out.println(b);
What
is
the
result?
A.
abcd
B.
ABCD
C.
dccd
D.
dcba
E.
Compilation
fails.
F.
An
exception
is
thrown
at
runtime.
10)
Given:
1.
public
class
Foo
{
2.
public
static
void
main
(String
[]
args)
{
3.
StringBuffer
a
=
new
StringBuffer
(“pccw”);
4.
StringBuffer
b
=
new
StringBuffer
(“solutions”);
5.
operate
(a,b);
6.
system.out.printIn{a
+
“,”
+b};
7.
)
8.
static
void
operate
(StringBuffer
x,
StringBuffer
y)
{
9.
x.append
(y);
10.
y
=
x;
11.
)
12.
}
What
is
the
result?
A.
The
code
compiles
and
prints
“pccw,solutions”.
B.
The
code
compiles
and
prints
“pccw,pccw”.
C.
The
code
compiles
and
prints
“solutions,solutions”.
D.
The
code
compiles
and
prints
“pccwsolutions,solutions”.
E.
The
code
compiles
and
prints
“pccwsolutions,
pccwsolutions”.
F.
The
code
does
not
compile
because
“+”
cannot
be
overloaded
for
StringBuffer.
11)
Given:
1.
public
class
X
{
2.
public
static
void
main
(String[]
args)
{
3.
byte
b
=
127;
4.
byte
c
=
126;
5.
byte
d
=
b
+
c;
6.
}
7.
}
Which
statement
is
true?
A.
Compilation
succeeds
and
d
takes
the
value
253.
B.
Line
5
contains
an
error
that
prevents
compilation.
C.
Line
5
throws
an
exception
indicating
“Out
of
range”
D.
Line
3
and
4
contain
error
that
prevent
compilation.
E.
The
compilation
succeeds
and
d
takes
the
value
of
1.
12)
Given:
Which
two
create
an
InputStream
and
open
file
the
“file.txt”
for
reading?
(Choose
Two)
A.
InputStream
in=new
FileReader(“file.txt”);
B.
InputStream
in=new
FileInputStream(“file.txt”);
C.
InputStream
in=new
InputStreamFileReader
(“file.txt”,
“read”);
D.
FileInputStream
in=new
FileReader(new
File(“file.txt”));
E.
FileInputStream
in=new
FileInputStream(new
File(“file.txt”));
Part
II：Java
EE
13)
Given
a
servlet
HelloServlet
mapped
to
hello.
and
a
form
declaration
in
HTML:
11.
<form
action="hello">
12.
<input
type="text"
name="hello">
13.
<input
type="text"
name="world">
14.
<input
type="submit"
value="submit">
15.</form>
what
HelloServlet
method
is
invoked
as
a
result
of
this
form
submission?
A.doGet
B.doPut
C.doPost
D.doTrace
E.doSubmit
14)
Given:
10.public
void
service(HttpServletRequest
resquest,HttpServletResponse
response){
11.
//
your
code
here
12.}
Which
code
snippet
inserted
at
line
11
cause
the
client
to
redirect
to
?
A.
response.sendRedirect("");
B.
response.sendRedirect(new
URL(""));
C.
RequestDispatch
rd
=
getServletContext().getRequestDispatcher("");
rd.forward(request,response);
D.
RequestDispatch
rd
=
getServletContext().getRequestDispatcher(new
URL(""));
rd.forward(request,response);
15)
Which
three
are
valid
URL
mapping
to
a
servlet
in
a
web
deployment
descriptor?(choose
three)
A.*/*
B./*.do
C.MyServlet
D./MyServlet
E./MyServlet/*
F.MyServlet/*.jsp
16)
Given
an
HttpServletRequest
request,which
retrieves
an
object
of
type
Account
with
and
id
of
"account"?
A.
Account
account
=
request.getResource("account");
B.
Account
account
=
request.getAttribute("account");
C.
Account
account
=
request.getParameter("account");
D.
Account
account
=
(Account).getResource("account");
E.
Account
account
=
(Account).getAttribute("account");
F.
Account
account
=
(Account).getParameter("account");
17)
For
which
three
event
can
web
application
event
listeners
be
registered?(choose
three)
A.
when
a
session
is
created
B.
after
a
servlet
is
destroyed
C.
when
a
session
has
timed
out
D.
when
a
cookie
has
been
created
E.
when
a
servlet
has
forwarded
a
request
F.
when
a
session
attribute
value
is
changed
Part
III：Database
18)
Which
two
statements
about
views
are
true?
(Choose
two.)
A.
A
view
can
be
created
as
read
only.
B.
A
view
can
be
created
as
a
join
on
two
or
more
tables.
C.
A
view
cannot
have
an
ORDER
BY
clause
in
the
SELECT
statement.
D.
A
view
cannot
be
created
with
a
GROUP
BY
clause
in
the
SELECT
statement.
E.
A
view
must
have
aliases
defined
for
the
column
names
in
the
SELECT
statement
19)
Examine
the
data
from
the
ORDERS
and
CUSTOMERS
table.
ORDERS
ORD_ID
ORD_DATE
CUST_ID
ORD_TOTAL
100
12-JAN-2000
15
10000
101
09-MAR-2000
40
8000
102
09-MAR-2000
35
12500
103
15-MAR-2000
15
12000
104
25-JUN-2000
15
6000
105
18-JUL-2000
20
5000
106
18-JUL-2000
35
7000
107
21-JUL-2000
20
6500
108
04-AUG-2000
10
8000
CUSTOMERS
CUST_ID
CUST_NAME
CITY
10
Smith
Los
Angeles
15
Bob
San
Francisco
20
Martin
Chicago
25
Mary
New
York
30
Rina
Chicago
35
Smith
New
York
40
Linda
New
York
Which
SQL
statement
retrieves
the
order
ID,
customer
ID,
and
order
total
for
the
orders
that
are
placed
on
the
same
day
that
Martin
places
his
orders?
A.
SELECT
ord_id,
cust_id,
ord_total
FROM
orders,
customers
WHERE
cust_name=’Mating’
AND
ord_date
IN
(’18-JUL-2000’,’21-JUL-2000’);
B.
SELECT
ord_id,
cust_id,
ord_total
FROM
orders
Where
ord_date
IN
(SELECT
ord_date
FROM
orders
WHERE
cust_id
=
(SELECT
cust_id
FROM
customers
WHERE
cust_name
=‘Martin’));
C.
SELECT
ord_id,
cust_id,
ord_total
FROM
orders
Where
ord_date
IN
(SELECT
ord_date
FROM
orders,
customers
Where
cust_name
=
‘Martin’);
D.
SELECT
ord_id,
cust_id,
ord_total
FROM
orders
WHERE
cust_id
IN
(SELECT
cust_id
FROM
customers
WHERE
cust
name
=
‘Martin’);
20)
Examine
the
structure
of
the
EMPLOYEES
and
NEW_EMPLOYEES
tables:
EMPLOYEES
EMPLOYEE_ID
NUMBER
Primary
Key
FIRST_NAME
VARCHARD2(25)
LAST_NAME
VARCHARD2(25)
HIRE_DATE
DATE
NEW
EMPLOYEES
EMPLOYEE_ID
NUMBER
Primary
Key
NAME
VARCHAR2(60)
Which
UPDATE
statement
is
valid?
A.
UPDATE
new_employees
SET
name
=
(Select
last_name||first_name
FROM
employees
Where
em
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