topic 1 java review test

7/21/2019 Topic 1 Java Review Test

1/12

Topic Test

Topic 1 - Java Review

Multiple Choice. Pick the best response to each question.

1. What is the output of the following coe seg!ent"

int x;

x = 1 + 3 * 2;

x = x * 2;System.out.println(x);

#. 7 $. 14 C. 16 %. 28 &. 'one of these

(. What is the output of the following coe seg!ent"

int x = 7;

int y = 3;

y++;

x--;

int z = x * y;

System.out.println(x + + y + + z);

#. 8 2 16 $. 7 3 21 C. 6 4 1! %. 6 4 24 &. 'one of these

). What is the output of the following coe seg!ent"

int x = 14;

int y = 4;

int z = x " y;

System.out.println(z);

#. 3 $. 3.# C. 4 %. co!pile error &. 'one of these

*. What is the output of the following coe seg!ent"

int x = 3;

$ou%le & = 4.!;

$ou%le % = x " &;

System.out.println(%);

#. ! $. !.7# C. 1 %. co!pile error &. 'one of these

+. What is the output of the following coe seg!ent"

$ou%le & = 3!.!;

$ou%le % = 8.!;

int x = (int)( & " % );

System.out.println(x);

#. 4 $. 3.7# C. 3 %. co!pile error &. 'one of these

Topic TestTopic 1 - Java Review

1


2/12

Topic Test


,. What is the output of the following coe seg!ent"

int x = 12;

int y = x;

x++;

x += #;System.out.println(x + + y);

#. 18 12 $. 18 18 C. 12 18 %. 18 13 &. 'one of these

or questions an / consier !etho &$o.

pu%li' oi$ &$o(int x int y)

x = y * 2;

y = x 3;

System.out.println( x + + y );

,

. What is the output of the following coe seg!ent"

&$o(2 1);

#. 2 1 $. 2 -1 C. 1 2 %. 1 -2 &. 'one of these

/. What is the output of the following coe seg!ent"

int & = 3;

int % = 2;

&$o(& %);

System.out.println( & + + % );

#. 3 ! 3 !

$. 3 ! 3 2

C. 4 1 4 1

%. 4 1 2 3

&. 'one of these

0. Consier the following coe seg!ent

int x;

int y;

""'o$e to initi&lize x &n$ y

i( x + y ! )

""%o$y o i st&tement

Which of the following are equivalent to the boolean e2pression x + y !"

3. x ! // y !

33. x ! 00 y !

333. x y

#. 3 onl4 $. 33 onl4 C. 333 onl4 %. 3 an 333 onl4 &. 'one of these


(


3/12

Topic Test


or questions 15 6 1) consier the following !ethos

pu%li' int tempest(int x int y)

return (x + y) " 2;

,

pu%li' int tempest(int x)

return x * x + 1;

,

pu%li' int sre( int x )

int y = tempest(x - 1 x * 3);

int result = !;

i( (y 2) == ! )

result = y " 2;

else

result = y;

return result;

,


System.out.println( tempest(# 3) );

#. # 3 $. x y C. 1! %. 4 &. 'one of these


System.out.println( tempest(3) );

#. 'othing $. 3 C. 3.! %. co!pile error &. 'one of these

1(. What is the output of the following coe seg!ent"

System.out.println( tempest( tempest(2) tempest(24) );

#. 'othing $. 1! C. 4 %. co!pile error &. 'one of these

1). What is the output of the following coe seg!ent"

System.out.println( sre(#) );

#. 4 $. # C. %. 1! &. 'one of these


)


4/12

Topic Test


1*. Consier the following coe seg!ent

int x;

int y;

"" 'o$e to initi&lize x &n$ y

i( x y )System.out.println(x);

else i( y x )

System.out.println(y);

else

System.out.println(x &n$ y);

3f the above seg!ent is e2ecute one ti!e how !an4 ti!es coul the println !etho be calle"

#. 5 $. 1 C. ( %. unknown &. 'one of these

1+. What is the output of the following coe seg!ent"

int x = 7!;

i( x ! )

System.out.print(&);

i( x 1! )

System.out.print(%);

i( x 1!! )

System.out.print(');

i( x ! // x 5 1!! )

System.out.print($);

#. &%$ $. & C. &% %. &%'$ &. 'one of these

1,. Consier the following coe seg!ent

int x;

"" 'o$e to initi&lize x

i( x 5 ! 00 x 1!!)

System.out.print(out o r&ne);

Which of the following values of 2 will cause the !essage 7out o r&ne7 to be printe"

. !

. 1!!

. 1#!

#. 3 onl4 $. 33 onl4 C. 333 onl4 %. 3 an 33 onl4 &. 'one of these


*


5/12

Topic Test



int tot&l = !;

in&l int 9: = 1!;

or(int i = !; i 5 9:; i++)

tot&l++;,

System.out.println( tot&l );

#. unknown $. ! C. %. 1! &. 'one of these

1/. What is the output of the following coe seg!ent"

int tot&l = !;

in&l int 9: = 1!;

or(int i = !; i 5 9:; i++)

or(int = !; 5 9:; ++)

tot&l++;

,,


#. 1! $. 1!! C. ! %. &. 'one of these


int tot&l = !;

in&l int 9: = #;

or(int i = !; i 5 9:; i++)

or(int = 9:; i; --)

tot&l++;,

,


#. ## $. 1# C. 12! %. #! &. 'one of these

(5. What is the output of the following coe seg!ent"

int x = 8;

int 'ount = !;

ile( x


6/12

Topic Test


(1. 3n the coe seg!ent fro! question (5 assu!e the first line is change to

int x = 3;

What is the output of the following coe seg!ent assu!ing nothing else is change"

#. . the loop never ter!inates $. 8 C. 6 %. 7 &. 'one of these

((. 3n the coe seg!ent fro! question (5 which of the following are logicall4 equivalent to the

while loop8s boolean e2pression9 x list = ne int#>;

or(int i = !; i 5 list.lent; i++)

listi> = i * 3;

,

System.out.println( list3> );

#. 3 $. 0 C. 12 %. ! &. 'one of these

(*. What is the output of the following coe seg!ent"

int> list = # 2 12 ! 11 2,;

System.out.println( list list1> + list3> > );

#. 12 $. 2 C. ! %. #n #rra43ne2:ut:f$ouns&2ception occurs &. 'one of these

(+. Consier the following coe seg!ent

int> list;

"" 'o$e to initi&lize list

or(int i = !; i 5 2!; i++)

listi> = #;,

When will the above coe result in an #rra43ne2:ut:f$ouns&2ception"

#. alwa4s $. never C. when listhas (5 or

!ore ele!ents

%. when listhas fewer

than (5 ele!ents

&. 'one of these


,


7/12

Topic Test


(,. Consier the following coe seg!ent

int> list;

int temp;

"" 'o$e to initi&lize list

or(int i = !; i 5 list.lent; i++)

temp = listi>;

listi> = list list.lent i>;

list list.lent i > = temp;

,

#ssu!e listis initiale to hol the following values

5 1 ( ) *

11 ) +

What are the contents of listafter the coe seg!ent e2ecutes"

#.

+ ) 11

$.

11 ) +

C.

11 ) +

%.

+ + + + +

&. 'one of these

(. What is the output of the following coe seg!ent"

Strin s1 = on;

Strin s2 = ?orns;

Strin s3 = s1 + s2;

System.out.println( s3 );

#. on $. ?orns C. on+?orns %. s3 &. 'one of these

(/. What is the output of the following coe seg!ent"

Strin s1 = @/9;

int x = #;

int y = 1;

Strin s3 = s1 + x + y;


#. @/9#1 $. @/96 C. @/9xy %. co!pile error &. 'one of these



8/12

Topic Test


(0. What is the output of the following coe seg!ent"

Strin s1 = @/9;

int x = #;

int y = 1;

Strin s3 = x + y + s1;


#. #1@/9 $. 6@/9 C. xy@/9 %. co!pile error &. 'one of these

)5. What is the output of the following coe seg!ent"

Strin s1 = A&nt&sti';

Strin s2 = s1.su%Strin(!3);


#. A&nt&sti' $. A&nt C. A&n %. runti!e error &. 'one of these


/


9/12

Topic Test


ree Response ;uestions

1. Write a !etho that has a single integer para!eter greater than 5. The !etho returns -1 if the

para!eter is 7eficient79 5 if it is 7perfect79 an 1 if it is 7e2cessive.7

# perfect nu!ber is one that is equal to the su! of its factors e2cluing itself.

The factors of , are 19(9)9,. &2cluing itself the su! of ,8s factors are 1 < ( = ) = ,.

, is a perfect nu!ber.

# nu!ber is eficient if the su! of its factors e2cluing itself are less than the nu!ber. / is

eficient because its factors are 19(9*9/. &2cluing itself the su! of /8s factors are 1 < ( < * = .

/ is eficient.

# nu!ber is e2cessive if the su! of its factors e2cluing itself are greater than the nu!ber. 1( is

e2cessive because its factors are 19 (9 )9 *9 ,9 1(.

&2cluing itself the su! of 1(8s factors are 1 < ( < ) < * < , = 1,.

1( is e2cessive.

pu%li' int num%er:ype(int num)

"" preB num !

"" postB return -1 i nums is $ei'ient ! i it is pere't or 1

"" i it ex'essie


0


10/12

Topic Test



15


11/12

Topic Test


(. Consier an arra4 of ints that represents !easure!ents of a person8s bloo sugar level over a

perio of ti!e. #ssu!e reaings are taken ever4 1+ !inutes. The reaings are store in the arra4

in the orer the4 are taken. Write a !etho that returns the length of the longest consecutive

series of reaings that are greater than or equal to so!e threshol value.

5 1 ( ) * + , / 0 15 11

1+5 1(+ 1+5 1++ 1*+ 1*5 1)+ 1(+ 1,5 1,+ 1++ 1(+

or e2a!ple9 assu!e the threshol is sent an argu!ent equal to 1+5. #n4 reaings greater than or

equal to the value of the threshol are consiere high. >our !etho !ust fin the length of the

longest consecutive series of reaings that are greater than or equal to the threshol. 3n the above

e2a!ple there are three series of reaings greater than or equal to the threshol9 ?5@9 ?(-)@9 ?/-15@.

The longest of these is three reaings so the !etho !ust return ). 3f no reaings are greater than

or equal to the threshol then the !etho !ust return 5.

Co!plete the following !etho

pu%li' int lonestStre&C(int> re&$ins int tresol$)

"" preB re&$ins


12/12

Topic Test



1(

topic 1 java review test

Documents