上海德邦物流股份有限公司招聘java面試真題

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[含多選]。（請在正確的答案上打”√”）Question

1)Which

of

the

following

statements

are

true?1)

An

interface

can

only

contain

method

and

not

variables2)

Interfaces

cannot

have

constructors3)

A

class

may

extend

only

one

other

class

and

implement

only

one

interface4)

Interfaces

are

the

Java

approach

to

addressing

its

lack

of

multiple

inheritance,

but

require

implementing

classes

to

create

the

functionality

of

the

Interfaces.Question

2)Which

of

the

following

statements

are

true?1)

The

garbage

collection

algorithm

in

Java

is

vendor

implemented2)

The

size

of

primitives

is

platform

dependent3)

The

default

type

for

a

numerical

literal

with

decimal

component

is

a

float.4)

You

can

modify

the

value

in

an

Instance

of

the

Integer

class

with

the

setValue

methodQuestion

3)Which

of

the

following

are

true

statements?1)

I/O

in

Java

can

only

be

performed

using

the

Listener

classes2)

The

RandomAccessFile

class

allows

you

to

move

directly

to

any

point

a

file.3)

The

creation

of

a

named

instance

of

the

File

class

creates

a

matching

file

in

the

underlying

operating

system

only

when

the

close

method

is

called.4)

The

characteristics

of

an

instance

of

the

File

class

such

as

the

directory

separator,

depend

on

the

current

underlying

operating

systemQuestion

4)What

will

happen

when

you

attempt

to

compile

and

run

the

following

codeclass

Base{public

void

Base(){System.out.println(“Base”);}}public

class

In

extends

Base{public

static

void

main(String

argv[]){In

i=new

In();}}1)

Compile

time

error

Base

is

a

keyword2)

Compilation

and

no

output

at

runtime3)

Output

of

Base4)

Runtime

error

Base

has

no

valid

constructorQuestion

5)You

have

a

public

class

called

myclass

with

the

main

method

defined

as

followspublic

static

void

main(String

parm[]){System.out.println(parm[0]);}If

you

attempt

to

compile

the

class

and

run

the

program

as

followsjava

myclass

helloWhat

will

happen?1)

Compile

time

error,

main

is

not

correctly

defined2)

Run

time

error,

main

is

not

correctly

defined3)

Compilation

and

output

of

java4)

Compilation

and

output

of

hello

Question

6)Which

of

the

following

statements

are

NOT

true?1)

If

a

class

has

any

abstract

methods

it

must

be

declared

abstract

itself.2)

When

applied

to

a

class,

the

final

modifier

means

it

cannot

be

sub-classed3)

All

methods

in

an

abstract

class

must

be

declared

as

abstract4)

transient

and

volatile

are

Java

modifiersQuestion

7)What

will

happen

when

you

attempt

to

compile

and

run

the

following

class?class

Base{Base(int

i){System.out.println(“Base”);}}class

Severn

extends

Base{public

static

void

main(String

argv[]){Severn

s

=

new

Severn();}void

Severn(){System.out.println(“Severn”);}}1)

Compilation

and

output

of

the

string

”Severn”

at

runtime2)

Compilation

and

no

output

at

runtime3)

Compile

time

error4)

Compilation

and

output

of

the

string

”Base”Question

8)Which

of

the

following

statements

are

true?1)

Static

methods

cannot

be

overriden

to

be

non

static2)

Static

methods

cannot

be

declared

as

private3)

Private

methods

cannot

be

overloaded4)

An

overloaded

method

cannot

throw

exceptions

not

checked

in

the

base

classQuestion

9)Which

of

the

following

statements

are

true?1)

The

automatic

garbage

collection

of

the

JVM

prevents

programs

from

ever

running

outof

memory2)

A

program

can

suggest

that

garbage

collection

be

performed

but

not

force

it3)

Garbage

collection

is

platform

independent4)

An

object

becomes

eligible

for

garbage

collection

when

all

references

denoting

it

are

set

to

null.Question

10)Given

the

following

codepublic

class

Sytch{int

x=2000;public

static

void

main(String

argv[]){System.out.println(“Ms

”+argv[1]+”Please

pay

$”+x);}}What

will

happen

if

you

attempt

to

compile

and

run

this

code

with

the

command

linejava

Sytch

Jones

Diggle1)

Compilation

and

output

of

Ms

Diggle

Please

pay

$20002)

Compile

time

error3)

Compilation

and

output

of

Ms

Jones

Please

pay

$20004)

Compilation

but

runtime

errorQuestion

11)You

need

to

read

in

the

lines

of

a

large

text

file

containing

tens

of

megabytes

of

data.

Which

of

the

following

would

be

most

suitable

for

reading

in

such

a

file1)

new

FileInputStream(“”)2)

new

InputStreamReader(new

FileInputStream(“”))3)

new

BufferedReader(new

InputStreamReader(new

FileInputStream(“”)));4)

new

RandomAccessFile

raf=new

RandomAccessFile(“myfile.txt”,”+rw”);Question

12)Which

of

the

following

statements

are

true?1)

Constructors

cannot

have

a

visibility

modifier2)

Constructors

are

not

inherited3)

Constructors

can

only

have

a

primitive

return

type4)

Constructors

can

be

marked

public

and

protected,

but

not

privateQuestion

13)Which

statement

is

true?

1)An

anonymous

inner

class

may

be

declared

as

final.

2)An

anonymous

inner

class

can

be

declared

as

private.

3)An

anonymous

inner

class

can

implement

multiple

interfaces

.

4)An

anonymous

inner

class

can

access

final

variables

in

any

enclosing

scope.

5)Construction

of

an

instance

of

a

static

inner

class

requires

an

instance

of

the

enclosing

outer

class.Question

14)public

class

Foo{public

static

void

main(String

sgf[]){StringBuffer

a

=

new

StringBuffer(“A”);

StringBuffer

b

=

new

StringBuffer(“B”);

operate(a,b);

System.out.println(a+”,”+b);

}

static

void

operate(StringBuffer

x,StringBuffer

y){x.append(y);

y=x;

}}

What

is

the

result?

1)The

code

compiles

and

prints

“A.B”.

2)The

code

compiles

and

prints

“A.A”.

3)The

code

compiles

and

prints

“B.B”.

4)The

code

compiles

and

prints

“AB.B”.

5)The

code

compiles

and

prints

“AB.AB”.Question

15)Which

of

the

following

thread

state

transitions

are

valid?

1)

From

ready

to

running.

2)

From

running

to

ready.

3)

From

running

to

waiting.

4)

From

waiting

to

running.

5)

From

waiting

to

ready.

6)

From

ready

to

waiting.Question

16)What

is

the

result

of

attempting

to

compile

and

run

the

following

program?public

class

Test

{private

int

i

=

j;

private

int

j

=

10;

public

static

void

main(String

args[])

{System.out.println((new

Test()).i);

}}

1)

Compiler

error

complaining

about

access

restriction

of

private

variables

of

Test.

2)

Compiler

error

complaining

about

forward

referencing.

3)

No

error

-

The

output

is

0;

4)

No

error

-

The

output

is

10;Question

17)Which

two

cannot

directly

cause

a

thread

to

stop

executing?

1)exiting

from

a

synchronized

block

2)calling

the

wait

method

on

an

object

3)calling

the

notify

method

on

an

object

4)calling

a

read

method

on

an

InputStream

object

5)calling

the

setPriority

method

on

a

thread

objectQuestion

18)Which

of

the

following

are

correct,

if

you

compile

the

following

code?public

class

CloseWindow

extends

Frame

implements

WindowListener

{public

CloseWindow()

{addWindowListener(this);

//

This

is

listener

registration

setSize(300,

300);

setVisible(true);

}public

void

windowClosing(WindowEvent

e)

{System.exit(0);

}

public

static

void

main(String

args[])

{CloseWindow

CW

=

new

CloseWindow();

}

}1)

Compile

time

error

2)

Run

time

error

3)

Code

compiles

but

Frames

does

not

listen

to

WindowEvents

4)

Compile

and

runs

successfullyQuestion

19)Which

statements

describe

guaranteed

behavior

of

the

garbage

collection

and

finalization

mechanisms?1)

Objects

are

deleted

when

they

can

no

longer

be

accessed

through

any

reference.

2)

The

finalize()

method

will

eventually

be

called

on

every

object.

3)

The

finalize()

method

will

never

be

called

more

than

once

on

an

object.

4)

An

object

will

not

be

garbage

collected

as

long

as

it

is

possible

for

an

active

part

of

the

program

to

access

it

through

a

reference.

5)

The

garbage

collector

will

use

a

mark

and

sweep

algorithm.Question

20)A

class

design

requires

that

a

member

variable

should

be

accessible

only

by

same

package,which

modifer

word

should

be

used?1)

protected2)

public3)

no

modifer4)

private二．簡答題。(80)

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