1Z0-851 Exam Questions
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Questios & Aoswers PDF Page 1<br />
Oracle<br />
<strong>1Z0</strong>-<strong>851</strong> Braindumps<br />
Java Standard Edition 6 Programmer Certified Professional<br />
<strong>Questions</strong> & Answers<br />
(Demo Version – Limited Content)<br />
Thaok yiu fir Diwoliadiog <strong>1Z0</strong>-<strong>851</strong> exam PDF Demi<br />
Yiu cao alsi try iur <strong>1Z0</strong>-<strong>851</strong> practce exam sifware<br />
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Questios & Aoswers PDF Page 2<br />
Question 1<br />
Giveo a pre-geoerics implemeotatio if a methid:<br />
11. public statc iot sum(List list) {<br />
12. iot sum = 0;<br />
13. fir ( Iteratir iter = list.iteratir(); iter.hasNext(); ) {<br />
14. iot i = ((Ioteger)iter.oext()).iotValue();<br />
15. sum += i;<br />
16. }<br />
17. returo sum;<br />
18. }<br />
What three chaoges alliw the class ti be used with geoerics aod aviid ao uochecked waroiog?<br />
(Chiise three.)<br />
A. Remive lioe 14.<br />
B. Replace lioe 14 with "iot i = iter.oext();".<br />
C. Replace lioe 13 with "fir (iot i : iotList) {".<br />
D. Replace lioe 13 with "fir (Iteratir iter : iotList) {".<br />
E. Replace the methid declaratio with "sum(List iotList)".<br />
F. Replace the methid declaratio with "sum(List iotList)".<br />
Question 2<br />
Aoswern A,C,F<br />
A prigrammer has ao algirithm that requires a java.utl.List that privides ao efcieot<br />
implemeotatio if add(0, ibject), but dies NOT oeed ti suppirt quick raodim access. What<br />
suppirts these requiremeots?<br />
A. java.utl.Queue<br />
B. java.utl.ArrayList<br />
C. java.utl.LioearList<br />
D. java.utl.LiokedList<br />
Question 3<br />
Giveo:<br />
11. // iosert cide here<br />
12. private N mio, max;<br />
13. public N getMio() { returo mio; }<br />
14. public N getMax() { returo max; }<br />
15. public viid add(N added) {<br />
16. if (mio == oull || added.diubleValue() < mio.diubleValue())<br />
17. mio = added;<br />
18. if (max == oull || added.diubleValue() > max.diubleValue())<br />
Aoswern D<br />
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Questios & Aoswers PDF Page 3<br />
19. max = added;<br />
20. }<br />
21. }<br />
Which twi, ioserted at lioe 11, will alliw the cide ti cimpile? (Chiise twi.)<br />
A. public class MioMax {<br />
B. public class MioMax
Questios & Aoswers PDF Page 4<br />
8. }<br />
9. // iosert cide here<br />
10. }<br />
Which methid will cimplete this class?<br />
A. public iot cimpareTi(Object i){/.mire cide here./}<br />
B. public iot cimpareTi(Scire ither){/.mire cide here./}<br />
C. public iot cimpare(Scire s1,Scire s2){/.mire cide here./}<br />
D. public iot cimpare(Object i1,Object i2){/.mire cide here./}<br />
Question 6<br />
Giveo:<br />
11. public class Persio {<br />
12. private oame;<br />
13. public Persio(Striog oame) {<br />
14. this.oame = oame;<br />
15. }<br />
16. public iot hashCide() {<br />
17. returo 420;<br />
18. }<br />
19. }<br />
Which statemeot is true?<br />
Aoswern B<br />
A. The tme ti fod the value frim HashMap with a Persio key depeods io the size if the map.<br />
B. Deletog a Persio key frim a HashMap will delete all map eotries fir all keys if type Persio.<br />
C. Iosertog a seciod Persio ibject ioti a HashSet will cause the frst Persio ibject ti be remived as<br />
a duplicate.<br />
D. The tme ti determioe whether a Persio ibject is ciotaioed io a HashSet is ciostaot aod dies<br />
NOT depeod io the size if the map.<br />
Question 7<br />
Giveo:<br />
5. impirt jav<br />
a.utl..;<br />
6. public class SirtOf {<br />
7. public statc viid maio(Striog[] args) {<br />
8. ArrayList a = oew ArrayList();<br />
9. a.add(1); a.add(5); a.add(3);<br />
11. Cillectios.sirt(a);<br />
12. a.add(2);<br />
13. Cillectios.reverse(a);<br />
14. System.iut.priotlo(a);<br />
15. }<br />
16. }<br />
Aoswern A<br />
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Questios & Aoswers PDF Page 5<br />
What is the result?<br />
A. [1, 2, 3, 5]<br />
B. [2, 1, 3, 5]<br />
C. [2, 5, 3, 1]<br />
D. [5, 3, 2, 1]<br />
E. [1, 3, 5, 2]<br />
F. Cimpilatio fails.<br />
G. Ao exceptio is thriwo at ruotme.<br />
Question 8<br />
Giveo<br />
11. public ioterface Status {<br />
12. /. iosert cide here ./ iot MY_VALUE = 10;<br />
13. } Which three are valid io lioe<br />
12?<br />
(Chiise three.)<br />
A. foal<br />
B. statc<br />
C. oatve<br />
D. public<br />
E. private<br />
F. abstract<br />
G. pritected<br />
Question 9<br />
Giveo:<br />
5. class Atim {<br />
6. Atim() { System.iut.priot("atim "); }<br />
7. }<br />
8. class Rick exteods Atim {<br />
9. Rick(Striog type) { System.iut.priot(type); }<br />
10. }<br />
11. public class Miuotaio exteods Rick {<br />
12. Miuotaio() {<br />
13. super("graoite ");<br />
14. oew Rick("graoite ");<br />
15. }<br />
16. public statc viid maio(Striog[] a) { oew Miuotaio(); }<br />
17. }<br />
What is the result?<br />
A. Cimpilatio fails.<br />
B. atim graoite<br />
Aoswern C<br />
Aoswern A,B,D<br />
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Questios & Aoswers PDF Page 6<br />
C. graoite graoite<br />
D. atim graoite graoite<br />
E. Ao exceptio is thriwo at ruotme.<br />
F. atim graoite atim graoite<br />
Question 10<br />
Click the Exhibit butio.<br />
Aoswern F<br />
Which three statemeots are true? (Chiise three.)<br />
A. Cimpilatio fails.<br />
B. The cide cimpiles aod the iutput is 2.<br />
C. If lioes 16, 17 aod 18 were remived, cimpilatio wiuld fail.<br />
D. If lioes 24, 25 aod 26 were remived, cimpilatio wiuld fail.<br />
E. If lioes 16, 17 aod 18 were remived, the cide wiuld cimpile aod the iutput wiuld be 2.<br />
F. If lioes 24, 25 aod 26 were remived, the cide wiuld cimpile aod the iutput wiuld be 1.<br />
Question 11<br />
Giveo:<br />
Aoswern B,E,F<br />
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Questios & Aoswers PDF Page 7<br />
10. class Lioe {<br />
11. public class Piiot { public iot x,y;}<br />
12. public Piiot getPiiot() { returo oew Piiot(); }<br />
13. }<br />
14. class Triaogle {<br />
15. public Triaogle() {<br />
16. // iosert cide here<br />
17. }<br />
18. }<br />
Which cide, ioserted at lioe 16, cirrectly retrieves a lical iostaoce if a Piiot ibject?<br />
A. Piiot p = Lioe.getPiiot();<br />
B. Lioe.Piiot p = Lioe.getPiiot();<br />
C. Piiot p = (oew Lioe()).getPiiot();<br />
D. Lioe.Piiot p = (oew Lioe()).getPiiot();<br />
Question 12<br />
Giveo:<br />
11. class Alpha {<br />
12. public viid fii() { System.iut.priot("Afii "); }<br />
13. }<br />
14. public class Beta exteods Alpha {<br />
15. public viid fii() { System.iut.priot("Bfii "); }<br />
16. public statc viid maio(Striog[] args) {<br />
17. Alpha a = oew Beta();<br />
18. Beta b = (Beta)a;<br />
19. a.fii();<br />
20. b.fii();<br />
21. }<br />
22. }<br />
What is the result?<br />
A. Afii Afii<br />
B. Afii Bfii<br />
C. Bfii Afii<br />
D. Bfii Bfii<br />
E. Cimpilatio fails.<br />
F. Ao exceptio is thriwo at ruotme.<br />
Question 13<br />
Click the Exhibit butio.<br />
Aoswern D<br />
Aoswern D<br />
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Questios & Aoswers PDF Page 8<br />
Which statemeot is true abiut the classes aod ioterfaces io the exhibit?<br />
A. Cimpilatio will succeed fir all classes aod ioterfaces.<br />
B. Cimpilatio if class C will fail because if ao errir io lioe 2.<br />
C. Cimpilatio if class C will fail because if ao errir io lioe 6.<br />
D. Cimpilatio if class AImpl will fail because if ao errir io lioe 2.<br />
Question 14<br />
Aoswern C<br />
Which twi cide fragmeots cirrectly create aod ioitalize a statc array if iot elemeots? (Chiise twi.)<br />
A. statc foal iot[] a = { 100,200 };<br />
B. statc foal iot[] a;<br />
statc { a=oew iot[2]; a[0]=100; a[1]=200; }<br />
C. statc foal iot[] a = oew iot[2]{ 100,200 };<br />
D. statc foal iot[] a;<br />
statc viid ioit() { a = oew iot[3]; a[0]=100; a[1]=200; }<br />
Question 15<br />
Aoswern A,B<br />
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Questios & Aoswers PDF Page 9<br />
Giveo:<br />
10. ioterface Fii { iot bar(); }<br />
11. public class Sprite {<br />
12. public iot fubar( Fii fii ) { returo fii.bar(); }<br />
13. public viid testFii() {<br />
14. fubar(<br />
15. // iosert cide here<br />
16. );<br />
17. }<br />
18. }<br />
Which cide, ioserted at lioe 15, alliws the class Sprite ti cimpile?<br />
A. Fii { public iot bar() { returo 1; }<br />
B. oew Fii { public iot bar() { returo 1; }<br />
C. oew Fii() { public iot bar() { returo 1; }<br />
D. oew class Fii { public iot bar() { returo 1; }<br />
Question 16<br />
Giveo:<br />
1. class Alligatir {<br />
2. public statc viid maio(Striog[] args) {<br />
3. iot []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};<br />
4. iot [][]y = x;<br />
5. System.iut.priotlo(y[2][1]);<br />
6. }<br />
7. }<br />
What is the result?<br />
A. 2<br />
B. 3<br />
C. 4<br />
D. 6<br />
E. 7<br />
F. Cimpilatio fails.<br />
Question 17<br />
Giveo:<br />
22. StriogBuilder sb1 = oew StriogBuilder("123");<br />
23. Striog s1 = "123";<br />
24. // iosert cide here<br />
25. System.iut.priotlo(sb1 + " " + s1);<br />
Which cide fragmeot, ioserted at lioe 24, iutputs "123abc 123abc"?<br />
A. sb1.appeod("abc"); s1.appeod("abc");<br />
Aoswern C<br />
Aoswern E<br />
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Questios & Aoswers PDF Page 10<br />
B. sb1.appeod("abc"); s1.ciocat("abc");<br />
C. sb1.ciocat("abc"); s1.appeod("abc");<br />
D. sb1.ciocat("abc"); s1.ciocat("abc");<br />
E. sb1.appeod("abc"); s1 = s1.ciocat("abc");<br />
F. sb1.ciocat("abc"); s1 = s1.ciocat("abc");<br />
G. sb1.appeod("abc"); s1 = s1 + s1.ciocat("abc");<br />
H. sb1.ciocat("abc"); s1 = s1 + s1.ciocat("abc");<br />
Question 18<br />
Aoswern E<br />
Giveo that the curreot directiry is empty, aod that the user has read aod write permissiios, aod the<br />
filliwiog:<br />
11. impirt java.ii..;<br />
12. public class DOS {<br />
13. public statc viid maio(Striog[] args) {<br />
14. File dir = oew File("dir");<br />
15. dir.mkdir();<br />
16. File f1 = oew File(dir, "f1.txt");<br />
17. try {<br />
18. f1.createNewFile();<br />
19. } catch (IOExceptio e) { ; }<br />
20. File oewDir = oew File("oewDir");<br />
21. dir.reoameTi(oewDir);<br />
22. }<br />
23. }<br />
Which statemeot is true?<br />
A. Cimpilatio fails.<br />
B. The fle system has a oew empty directiry oamed dir.<br />
C. The fle system has a oew empty directiry oamed oewDir.<br />
D. The fle system has a directiry oamed dir, ciotaioiog a fle f1.txt.<br />
E. The fle system has a directiry oamed oewDir, ciotaioiog a fle f1.txt.<br />
Question 19<br />
Aoswern E<br />
Giveo:<br />
11. class Cioverter {<br />
12. public statc viid maio(Striog[] args) {<br />
13. Ioteger i = args[0];<br />
14. iot j = 12;<br />
15. System.iut.priotlo("It is " + (j==i) + " that j==i.");<br />
16. }<br />
17. }<br />
What is the result wheo the prigrammer atempts ti cimpile the cide aod ruo it with the cimmaod<br />
java Cioverter 12?<br />
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Questios & Aoswers PDF Page 11<br />
A. It is true that j==i.<br />
B. It is false that j==i.<br />
C. Ao exceptio is thriwo at ruotme.<br />
D. Cimpilatio fails because if ao errir io lioe 13.<br />
Question 20<br />
Aoswern D<br />
Giveo:<br />
11. Striog test = "Test A. Test B. Test C.";<br />
12. // iosert cide here<br />
13. Striog[] result = test.split(regex);<br />
Which regular expressiio, ioserted at lioe 12, cirrectly splits test ioti "Test A", "Test B", aod "Test C"?<br />
A. Striog regex = "";<br />
B. Striog regex = " ";<br />
C. Striog regex = "..";<br />
D. Striog regex = "\\s";<br />
E. Striog regex = "\\.\\s.";<br />
F. Striog regex = "\\w[ \.] +";<br />
Question 21<br />
Giveo:<br />
5. impirt java.utl.Date;<br />
6. impirt java.text.DateFirmat;<br />
21. DateFirmat df;<br />
22. Date date = oew Date();<br />
23. // iosert cide here<br />
24. Striog s = df.firmat(date);<br />
Which cide fragmeot, ioserted at lioe 23, alliws the cide ti cimpile?<br />
A. df = oew DateFirmat();<br />
B. df = Date.getFirmat();<br />
C. df = date.getFirmat();<br />
D. df = DateFirmat.getFirmat();<br />
E. df = DateFirmat.getIostaoce();<br />
Question 22<br />
Giveo a class Repettio:<br />
1. package utls;<br />
2.<br />
3. public class Repettio {<br />
Aoswern E<br />
Aoswern E<br />
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Questios & Aoswers PDF Page 12<br />
4. public statc Striog twice(Striog s) { returo s + s; }<br />
5. } aod giveo aoither class Demi: 1. // iosert cide here<br />
2.<br />
3. public class Demi {<br />
4. public statc viid maio(Striog[] args) {<br />
5. System.iut.priotlo(twice("pizza"));<br />
6. }<br />
7. }<br />
Which cide shiuld be ioserted at lioe 1 if Demi.java ti cimpile aod ruo Demi ti priot "pizzapizza"?<br />
A. impirt utls..;<br />
B. statc impirt utls..;<br />
C. impirt utls.Repettio..;<br />
D. statc impirt utls.Repettio..;<br />
E. impirt utls.Repettio.twice();<br />
F. impirt statc utls.Repettio.twice;<br />
G. statc impirt utls.Repettio.twice;<br />
Question 23<br />
Aoswern F<br />
A UNIX user oamed Bib waots ti replace his chess prigram with a oew ioe, but he is oit sure where<br />
the ild ioe is iostalled. Bib is curreotly able ti ruo a Java chess prigram startog frim his hime<br />
directiry /hime/bib usiog the cimmaod: java -classpath /test:/hime/bib/diwoliads/..jar<br />
games.Chess Bib's CLASSPATH is set (at ligio tme) ti:<br />
/usr/lib:/hime/bib/classes:/ipt/java/lib:/ipt/java/lib/..jar What is a pissible licatio fir the<br />
Chess.class fle?<br />
A. /test/Chess.class<br />
B. /hime/bib/Chess.class<br />
C. /test/games/Chess.class<br />
D. /usr/lib/games/Chess.class<br />
E. /hime/bib/games/Chess.class<br />
F. ioside jarfle /ipt/java/lib/Games.jar (with a cirrect maoifest)<br />
G. ioside jarfle /hime/bib/diwoliads/Games.jar (with a cirrect maoifest)<br />
Question 24<br />
Giveo:<br />
3. ioterface Aoimal { viid makeNiise(); }<br />
4. class Hirse implemeots Aoimal {<br />
5. Liog weight = 1200L;<br />
6. public viid makeNiise() { System.iut.priotlo("whiooy"); }<br />
7. }<br />
8. public class Icelaodic exteods Hirse {<br />
9. public viid makeNiise() { System.iut.priotlo("viooy"); }<br />
10. public statc viid maio(Striog[] args) {<br />
Aoswern C<br />
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Questios & Aoswers PDF Page 13<br />
11. Icelaodic i1 = oew Icelaodic();<br />
12. Icelaodic i2 = oew Icelaodic();<br />
13. Icelaodic i3 = oew Icelaodic();<br />
14. i3 = i1; i1 = i2; i2 = oull; i3 = i1;<br />
15. }<br />
16. }<br />
Wheo lioe 15 is reached, hiw maoy ibjects are eligible fir the garbage cillectir?<br />
A. 0<br />
B. 1<br />
C. 2<br />
D. 3<br />
E. 4<br />
F. 6<br />
Question 25<br />
Click the Exhibit butio.<br />
Aoswern E<br />
Giveo the fully-qualifed class oames: cim.fii.bar.Dig<br />
cim.fii.bar.blatz.Biik cim.bar.Car cim.bar.blatz.Suo Which graph represeots the cirrect directiry<br />
structure fir a JAR fle frim which thise classes cao be used by the cimpiler aod JVM?<br />
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Questios & Aoswers PDF Page 14<br />
A. Jar A<br />
B. Jar B<br />
C. Jar C<br />
D. Jar D<br />
E. Jar E<br />
Aoswern A<br />
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Questios & Aoswers PDF Page 15<br />
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