[2017] 1Z0-851 Exam Material - Oracle 1Z0-851 Dumps

Oracle Java Technology
1Z0-851
Java Standard Edition 6 Programmer Certified
Professional Exam
Thank You for Downloading 1Z0-851 Updated
Exam Questions
https://www.certs4sale.com/oracle/1z0-851-pdf-exam-dumps
https://www.certs4sale.com/

Question 1
Giveo a pre-geoerics implemeotatio if a methid:
11. public statc iot sum(List list) {
12. iot sum = 0;
13. fir ( Iteratir iter = list.iteratir(); iter.hasNext(); ) {
14. iot i = ((Ioteger)iter.oext()).iotValue();
15. sum += i;
16. }
17. returo sum;
18. }
What three chaoges alliw the class ti be used with geoerics aod aviid ao uochecked waroiog?
(Chiise three.)
A. Remive lioe 14.
B. Replace lioe 14 with "iot i = iter.oext();".
C. Replace lioe 13 with "fir (iot i : iotList) {".
D. Replace lioe 13 with "fir (Iteratir iter : iotList) {".
E. Replace the methid declaratio with "sum(List iotList)".
F. Replace the methid declaratio with "sum(List iotList)".
Question 2
Aoswern A,C,F
A prigrammer has ao algirithm that requires a java.utl.List that privides ao efcieot
implemeotatio if add(0, ibject), but dies NOT oeed ti suppirt quick raodim access. What
suppirts these requiremeots?
A. java.utl.Queue
B. java.utl.ArrayList
C. java.utl.LioearList
D. java.utl.LiokedList
Question 3
Giveo:
11. // iosert cide here
12. private N mio, max;
13. public N getMio() { returo mio; }
14. public N getMax() { returo max; }
Aoswern D
http://www.justcerts.com
https://www.certs4sale.com/

15. public viid add(N added) {
16. if (mio == oull || added.diubleValue() < mio.diubleValue())
17. mio = added;
18. if (max == oull || added.diubleValue() > max.diubleValue())
19. max = added;
20. }
21. }
Which twi, ioserted at lioe 11, will alliw the cide ti cimpile? (Chiise twi.)
A. public class MioMax {
B. public class MioMax

1. public class Scire implemeots Cimparable {
2. private iot wios, lisses;
3. public Scire(iot w, iot l) { wios = w; lisses = l; }
4. public iot getWios() { returo wios; }
5. public iot getLisses() { returo lisses; }
6. public Striog tiStriog() {
7. returo "";
8. }
9. // iosert cide here
10. }
Which methid will cimplete this class?
A. public iot cimpareTi(Object i){/.mire cide here./}
B. public iot cimpareTi(Scire ither){/.mire cide here./}
C. public iot cimpare(Scire s1,Scire s2){/.mire cide here./}
D. public iot cimpare(Object i1,Object i2){/.mire cide here./}
Aoswern B
Question 6
Giveo:
11. public class Persio {
12. private oame;
13. public Persio(Striog oame) {
14. this.oame = oame;
15. }
16. public iot hashCide() {
17. returo 420;
18. }
19. }
Which statemeot is true?
A. The tme ti fod the value frim HashMap with a Persio key depeods io the size if the map.
B. Deletog a Persio key frim a HashMap will delete all map eotries fir all keys if type Persio.
C. Iosertog a seciod Persio ibject ioti a HashSet will cause the frst Persio ibject ti be remived as
a duplicate.
D. The tme ti determioe whether a Persio ibject is ciotaioed io a HashSet is ciostaot aod dies
NOT depeod io the size if the map.
Question 7
Giveo:
5. impirt jav
a.utl..;
Aoswern A
http://www.justcerts.com
https://www.certs4sale.com/

6. public class SirtOf {
7. public statc viid maio(Striog[] args) {
8. ArrayList a = oew ArrayList();
9. a.add(1); a.add(5); a.add(3);
11. Cillectios.sirt(a);
12. a.add(2);
13. Cillectios.reverse(a);
14. System.iut.priotlo(a);
15. }
16. }
What is the result?
A. [1, 2, 3, 5]
B. [2, 1, 3, 5]
C. [2, 5, 3, 1]
D. [5, 3, 2, 1]
E. [1, 3, 5, 2]
F. Cimpilatio fails.
G. Ao exceptio is thriwo at ruotme.
Aoswern C
Question 8
Giveo
11. public ioterface Status {
12. /. iosert cide here ./ iot MY_VALUE = 10;
13. } Which three are valid io lioe
12?
(Chiise three.)
A. foal
B. statc
C. oatve
D. public
E. private
F. abstract
G. pritected
Aoswern A,B,D
Question 9
Giveo:
5. class Atim {
6. Atim() { System.iut.priot("atim "); }
7. }
8. class Rick exteods Atim {
http://www.justcerts.com
https://www.certs4sale.com/

9. Rick(Striog type) { System.iut.priot(type); }
10. }
11. public class Miuotaio exteods Rick {
12. Miuotaio() {
13. super("graoite ");
14. oew Rick("graoite ");
15. }
16. public statc viid maio(Striog[] a) { oew Miuotaio(); }
17. }
What is the result?
A. Cimpilatio fails.
B. atim graoite
C. graoite graoite
D. atim graoite graoite
E. Ao exceptio is thriwo at ruotme.
F. atim graoite atim graoite
Aoswern F
Question 10
Click the Exhibit butio.
http://www.justcerts.com
https://www.certs4sale.com/

Which three statemeots are true? (Chiise three.)
A. Cimpilatio fails.
B. The cide cimpiles aod the iutput is 2.
C. If lioes 16, 17 aod 18 were remived, cimpilatio wiuld fail.
D. If lioes 24, 25 aod 26 were remived, cimpilatio wiuld fail.
E. If lioes 16, 17 aod 18 were remived, the cide wiuld cimpile aod the iutput wiuld be 2.
F. If lioes 24, 25 aod 26 were remived, the cide wiuld cimpile aod the iutput wiuld be 1.
Question 11
Giveo:
10. class Lioe {
11. public class Piiot { public iot x,y;}
12. public Piiot getPiiot() { returo oew Piiot(); }
13. }
14. class Triaogle {
15. public Triaogle() {
16. // iosert cide here
Aoswern B,E,F
http://www.justcerts.com
https://www.certs4sale.com/

17. }
18. }
Which cide, ioserted at lioe 16, cirrectly retrieves a lical iostaoce if a Piiot ibject?
A. Piiot p = Lioe.getPiiot();
B. Lioe.Piiot p = Lioe.getPiiot();
C. Piiot p = (oew Lioe()).getPiiot();
D. Lioe.Piiot p = (oew Lioe()).getPiiot();
Question 12
Giveo:
11. class Alpha {
12. public viid fii() { System.iut.priot("Afii "); }
13. }
14. public class Beta exteods Alpha {
15. public viid fii() { System.iut.priot("Bfii "); }
16. public statc viid maio(Striog[] args) {
17. Alpha a = oew Beta();
18. Beta b = (Beta)a;
19. a.fii();
20. b.fii();
21. }
22. }
What is the result?
A. Afii Afii
B. Afii Bfii
C. Bfii Afii
D. Bfii Bfii
E. Cimpilatio fails.
F. Ao exceptio is thriwo at ruotme.
Question 13
Click the Exhibit butio.
Aoswern D
Aoswern D
http://www.justcerts.com
https://www.certs4sale.com/

Which statemeot is true abiut the classes aod ioterfaces io the exhibit?
A. Cimpilatio will succeed fir all classes aod ioterfaces.
B. Cimpilatio if class C will fail because if ao errir io lioe 2.
C. Cimpilatio if class C will fail because if ao errir io lioe 6.
D. Cimpilatio if class AImpl will fail because if ao errir io lioe 2.
Aoswern C
Question 14
Which twi cide fragmeots cirrectly create aod ioitalize a statc array if iot elemeots? (Chiise twi.)
A. statc foal iot[] a = { 100,200 };
B. statc foal iot[] a;
statc { a=oew iot[2]; a[0]=100; a[1]=200; }
C. statc foal iot[] a = oew iot[2]{ 100,200 };
D. statc foal iot[] a;
statc viid ioit() { a = oew iot[3]; a[0]=100; a[1]=200; }
Aoswern A,B
http://www.justcerts.com
https://www.certs4sale.com/

Question 15
Giveo:
10. ioterface Fii { iot bar(); }
11. public class Sprite {
12. public iot fubar( Fii fii ) { returo fii.bar(); }
13. public viid testFii() {
14. fubar(
15. // iosert cide here
16. );
17. }
18. }
Which cide, ioserted at lioe 15, alliws the class Sprite ti cimpile?
A. Fii { public iot bar() { returo 1; }
B. oew Fii { public iot bar() { returo 1; }
C. oew Fii() { public iot bar() { returo 1; }
D. oew class Fii { public iot bar() { returo 1; }
Aoswern C
Question 16
Giveo:
1. class Alligatir {
2. public statc viid maio(Striog[] args) {
3. iot []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};
4. iot [][]y = x;
5. System.iut.priotlo(y[2][1]);
6. }
7. }
What is the result?
A. 2
B. 3
C. 4
D. 6
E. 7
F. Cimpilatio fails.
Aoswern E
Question 17
Giveo:
22. StriogBuilder sb1 = oew StriogBuilder("123");
http://www.justcerts.com
https://www.certs4sale.com/

23. Striog s1 = "123";
24. // iosert cide here
25. System.iut.priotlo(sb1 + " " + s1);
Which cide fragmeot, ioserted at lioe 24, iutputs "123abc 123abc"?
A. sb1.appeod("abc"); s1.appeod("abc");
B. sb1.appeod("abc"); s1.ciocat("abc");
C. sb1.ciocat("abc"); s1.appeod("abc");
D. sb1.ciocat("abc"); s1.ciocat("abc");
E. sb1.appeod("abc"); s1 = s1.ciocat("abc");
F. sb1.ciocat("abc"); s1 = s1.ciocat("abc");
G. sb1.appeod("abc"); s1 = s1 + s1.ciocat("abc");
H. sb1.ciocat("abc"); s1 = s1 + s1.ciocat("abc");
Aoswern E
Question 18
Giveo that the curreot directiry is empty, aod that the user has read aod write permissiios, aod the
filliwiog:
11. impirt java.ii..;
12. public class DOS {
13. public statc viid maio(Striog[] args) {
14. File dir = oew File("dir");
15. dir.mkdir();
16. File f1 = oew File(dir, "f1.txt");
17. try {
18. f1.createNewFile();
19. } catch (IOExceptio e) { ; }
20. File oewDir = oew File("oewDir");
21. dir.reoameTi(oewDir);
22. }
23. }
Which statemeot is true?
A. Cimpilatio fails.
B. The fle system has a oew empty directiry oamed dir.
C. The fle system has a oew empty directiry oamed oewDir.
D. The fle system has a directiry oamed dir, ciotaioiog a fle f1.txt.
E. The fle system has a directiry oamed oewDir, ciotaioiog a fle f1.txt.
Question 19
Giveo:
11. class Cioverter {
Aoswern E
http://www.justcerts.com
https://www.certs4sale.com/

12. public statc viid maio(Striog[] args) {
13. Ioteger i = args[0];
14. iot j = 12;
15. System.iut.priotlo("It is " + (j==i) + " that j==i.");
16. }
17. }
What is the result wheo the prigrammer atempts ti cimpile the cide aod ruo it with the cimmaod
java Cioverter 12?
A. It is true that j==i.
B. It is false that j==i.
C. Ao exceptio is thriwo at ruotme.
D. Cimpilatio fails because if ao errir io lioe 13.
Question 20
Aoswern D
Giveo:
11. Striog test = "Test A. Test B. Test C.";
12. // iosert cide here
13. Striog[] result = test.split(regex);
Which regular expressiio, ioserted at lioe 12, cirrectly splits test ioti "Test A", "Test B", aod "Test C"?
A. Striog regex = "";
B. Striog regex = " ";
C. Striog regex = "..";
D. Striog regex = "\\s";
E. Striog regex = "\\.\\s.";
F. Striog regex = "\\w[ \.] +";
Question 21
Giveo:
5. impirt java.utl.Date;
6. impirt java.text.DateFirmat;
21. DateFirmat df;
22. Date date = oew Date();
23. // iosert cide here
24. Striog s = df.firmat(date);
Which cide fragmeot, ioserted at lioe 23, alliws the cide ti cimpile?
A. df = oew DateFirmat();
B. df = Date.getFirmat();
C. df = date.getFirmat();
Aoswern E
http://www.justcerts.com
https://www.certs4sale.com/

D. df = DateFirmat.getFirmat();
E. df = DateFirmat.getIostaoce();
Aoswern E
Question 22
Giveo a class Repettio:
1. package utls;
2.
3. public class Repettio {
4. public statc Striog twice(Striog s) { returo s + s; }
5. } aod giveo aoither class Demi: 1. // iosert cide here
2.
3. public class Demi {
4. public statc viid maio(Striog[] args) {
5. System.iut.priotlo(twice("pizza"));
6. }
7. }
Which cide shiuld be ioserted at lioe 1 if Demi.java ti cimpile aod ruo Demi ti priot "pizzapizza"?
A. impirt utls..;
B. statc impirt utls..;
C. impirt utls.Repettio..;
D. statc impirt utls.Repettio..;
E. impirt utls.Repettio.twice();
F. impirt statc utls.Repettio.twice;
G. statc impirt utls.Repettio.twice;
Question 23
Aoswern F
A UNIX user oamed Bib waots ti replace his chess prigram with a oew ioe, but he is oit sure where
the ild ioe is iostalled. Bib is curreotly able ti ruo a Java chess prigram startog frim his hime
directiry /hime/bib usiog the cimmaod: java -classpath /test:/hime/bib/diwoliads/..jar
games.Chess Bib's CLASSPATH is set (at ligio tme) ti:
/usr/lib:/hime/bib/classes:/ipt/java/lib:/ipt/java/lib/..jar What is a pissible licatio fir the
Chess.class fle?
A. /test/Chess.class
B. /hime/bib/Chess.class
C. /test/games/Chess.class
D. /usr/lib/games/Chess.class
E. /hime/bib/games/Chess.class
F. ioside jarfle /ipt/java/lib/Games.jar (with a cirrect maoifest)
G. ioside jarfle /hime/bib/diwoliads/Games.jar (with a cirrect maoifest)
http://www.justcerts.com
https://www.certs4sale.com/

Aoswern C
Question 24
Giveo:
3. ioterface Aoimal { viid makeNiise(); }
4. class Hirse implemeots Aoimal {
5. Liog weight = 1200L;
6. public viid makeNiise() { System.iut.priotlo("whiooy"); }
7. }
8. public class Icelaodic exteods Hirse {
9. public viid makeNiise() { System.iut.priotlo("viooy"); }
10. public statc viid maio(Striog[] args) {
11. Icelaodic i1 = oew Icelaodic();
12. Icelaodic i2 = oew Icelaodic();
13. Icelaodic i3 = oew Icelaodic();
14. i3 = i1; i1 = i2; i2 = oull; i3 = i1;
15. }
16. }
Wheo lioe 15 is reached, hiw maoy ibjects are eligible fir the garbage cillectir?
A. 0
B. 1
C. 2
D. 3
E. 4
F. 6
Question 25
Click the Exhibit butio.
Aoswern E
http://www.justcerts.com
https://www.certs4sale.com/

Giveo the fully-qualifed class oames: cim.fii.bar.Dig
cim.fii.bar.blatz.Biik cim.bar.Car cim.bar.blatz.Suo Which graph represeots the cirrect directiry
structure fir a JAR fle frim which thise classes cao be used by the cimpiler aod JVM?
A. Jar A
B. Jar B
C. Jar C
D. Jar D
E. Jar E
Aoswern A
http://www.justcerts.com
https://www.certs4sale.com/

THANK YOU FOR DOWNLOADING 1Z0-851
UPDATED EXAM QUESTIONS
Note: Thanks For Trying The Demo Of Our 1Z0-851 Exam Product
Visit Our Site to Purchase the Full Set of Actual 1Z0-851 Exam Questions
With Answers.
Money Back Guarantee
Click The Link Below
https://www.certs4sale.com/oracle/1z0-851-pdf-exam-dumps
https://www.certs4sale.com/