1Z1-804 by Oracle Valid Free Exam Practice Test

Question 1

Given: And the commands: javac Counter.java java ea Counter

What is the result?

A. 3 B. NullPointException is thrown at runtime C. AssertionError is thrown at runtime D. 2 E. Compilation fails

Correct Answer: A

Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).

Question 2

Given:
StringBuffer b = new StringBuffer("3"); System.out.print(5+4+b+2+1);
What is the result?

A. 5433 B. 933 C. Output is Similar to: 9java.lang.StringBuffer@100490121. D. 9321 E. 54321 F. Compilation fails.

Correct Answer: F

Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).

Question 3

Given:

What is the result?

A. Compilation fails at line 9 B. Compilation fails at line 11 C. Cue sports, Cue sports D. Compilation fails at line 13 E. Compilation fails at line 12

Correct Answer: A

Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).

Question 4

Given the code fragment: Which two try statements, when inserted at line ***, enable you to print files with the extensions.java, .htm, and .jar.

A. try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir,"*.{java*,htm*,jar*}")) { B. try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir,"*. [java,htm,jar]")) { C. try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir,"*.{java,htm,jar}")){ D. try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir,"**.{java,htm,jar}")) {

Correct Answer: C,D

Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).

Question 5

Given:

Which of the four are valid modifications to synchronize access to the valid list between threads t1 and t2?

A. Replace line 3 with:
synchronized public static void addItem () {
korrekte Schreibweise: synchronized public static void addItem () { B. Replace Line 2 with:
static CopyWriteArrayList<Integer> list = new CopyWriteArrayList<>();
korrekte Schreibweise: static CopyOnWriteArrayList<Integer> list = new
CopyOnWriteArrayList<>(); C. Replace line 1 with:
Synchronized (t2) (t1.start();) synchronized(t1) (t2.start(); )
korrekte Schreibweise: synchronized (t2) {t1.start();} synchronized(t1) { t2.start();} D. Replace line 5 with:
Synchronized public void run () {
korrekte Schreibweise: synchronized public void run () { E. Replace line 4 with:
synchronized (list) (list.add(1);)
korrekte Schreibweise: synchronized (list) { (list.add(1); } F. Replace line 6 with:
synchronized (bar) {for (int i= 0; i<5000; i++) WorkPool.addItem(); }
korrekte Schreibweise: synchronized (bar) {for (int i= 0; i<500; i++) WorkPool.addItem(); } G. replace line 6 with:
Synchronized (this) {for (in i = 0, i<5000, i++) WorkPool.addItem(); }
korrekte Schreibweise: synchronized (this) {for (int i = 0; i<500; i++) WorkPool.addItem(); }

Correct Answer: A,B,E

Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).

Question 6

Given this code fragment:

Assume that the SQL query returns records.
What is the result?

A. Compilation fails at line 14 B. Compilation fails due to error at line 17 C. The program prints each record D. The program prints Error

Correct Answer: C

Question 7

Given:

What is the most likely result?

A. Two Main One B. One Two Main C. One Main Two D. Main One Two E. Main Two One

Correct Answer: B

Question 8

Given:

Which two classes correctly override the getDepth method?

A. public class deep extends Deeper {
public Short getDepth () {
return 5;
}} B. public class deep extends Deeper { public String getDepth () { }} C. public class deep extends Deeper {
public Long getDepth (int d) {
return 5L;
}} D. public class deep extends Deeper {
protected Integer getDepth(){
return 5;
}} E. public class deep extends Deeper {
public Double getDepth() {
return 5d;
}}

Correct Answer: A,D

Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).

Oracle Java SE 7 Programmer II - 1Z1-804 Exam Practice Test