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Given the code fragment:

Which should be inserted into the line n1 to print Average = 2.5?

Stream str = Stream.of(1, 2, 3, 4);
IntStream str = IntStream.of(1, 2, 3, 4);
DoubleStream str = Stream.of(1.0, 2.0, 3.0, 4.0);
IntStream str = Stream.of(1, 2, 3, 4)

Correct answer: B

Explanation:

Use IntStream. Reference: https://docs.oracle.com/javase/8/docs/api/java/util/stream/IntStream.html

Use IntStream.

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/stream/IntStream.html

Given the interface:

Which class implements IdGenerator in a thread-safe manner, so that no threats can get a duplicate id value during concurrent access?

Correct answer: B

Explanation:

An AtomicInteger is used in applications such as atomically incremented counters, and cannot be used as a replacement for an Integer. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes. The incrementAndGet() method atomically increments by one the current value. Reference: http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html#incrementAndGet--

An AtomicInteger is used in applications such as atomically incremented counters, and cannot be used as a replacement for an Integer. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.

The incrementAndGet() method atomically increments by one the current value.

Reference: http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html#incrementAndGet--

Which two statements are true about localizing an application? (Choose two.)

Language codes use lowercase and region codes use uppercase letters.
Resource bundle files include date and currency information.
Language and region-specific programs are created using localized data.
Support for new regional languages does not require recompilation of the code.
Textual elements (messages and GUI labels) are hard-coded on the code.

Correct answer: AC

Explanation:

A: The following examples create Locale objects for the French language in Canada, the English language in the U.S. and Great Britain.aLocale = new Locale("fr", "CA"); bLocale = new Locale("en", "US"); cLocale = new Locale("en", "GB"); C: Localization is the process of adapting an internationalized application to support a specific region or locale.Incorrect Answers:B: Resource bundle files does not include date a currency information. Date and currency information are stored in locales, not in resource bundle files.D: Recompilation is not necessary.E: Textual elements are not hard-coded on the code.References:https://docs.oracle.com/javase/tutorial/i18n/locale/create.htmlhttp://docs.oracle.com/javaee/6/tutorial/doc/bnaxw.html

A: The following examples create Locale objects for the French language in Canada, the English language in the U.S. and Great Britain.

aLocale = new Locale("fr", "CA");

bLocale = new Locale("en", "US");

cLocale = new Locale("en", "GB");

C: Localization is the process of adapting an internationalized application to support a specific region or locale.

Incorrect Answers:

B: Resource bundle files does not include date a currency information. Date and currency information are stored in locales, not in resource bundle files.

D: Recompilation is not necessary.

E: Textual elements are not hard-coded on the code.

References:

https://docs.oracle.com/javase/tutorial/i18n/locale/create.html

http://docs.oracle.com/javaee/6/tutorial/doc/bnaxw.html

Given the code fragment:

Which is the valid definition for the Greeter interface to enable the code fragment to print Kathy Welcome!?

Correct answer: A

Explanation:

Code example works fine:

Given the code fragment:

What is the result?

invalid
An exception is thrown at runtime.
NULL
Compilation fails.
blank

Correct answer: B

Explanation:

A java.lang.NullPointerException is through at line switch(str) {.

Given:

Which result is possible?

Compilation fails.
L1 L2 L3
L2 L3
L1 L3
L3

Correct answer: B

Explanation:

The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run. This interface is designed to provide a common protocol for objects that wish to execute code while they are active. Reference: http://docs.oracle.com/javase/7/docs/api/java/lang/Runnable.html

The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run.

This interface is designed to provide a common protocol for objects that wish to execute code while they are active.

Reference: http://docs.oracle.com/javase/7/docs/api/java/lang/Runnable.html

Given the fragment:

Which code fragment, when inserted at line n1, enables the code to print ABCD?

String str = sList.stream().reduce(“”,(s1, s2) -> s1.concat(s2));
String str = sList.stream().reduce(“A”,(s1, s2) -> s1.concat(s2));
String str = sList.stream().reduce((s1, s2) -> s1.concat(s2));
String str = sList.stream().reduce(“A”,String::concat);

Correct answer: A

Explanation:

The java.util.Arrays.asList(T... a) returns a fixed-size list backed by the specified array. Note: Use the following import statements to be able to run the code.import java.util.Arrays; import java.util.List; Incorrect Answers:B, D: Output is AABCDReference: https://www.tutorialspoint.com/java/util/arrays_aslist.htm

The java.util.Arrays.asList(T... a) returns a fixed-size list backed by the specified array.

Note: Use the following import statements to be able to run the code.

import java.util.Arrays;

import java.util.List;

Incorrect Answers:

B, D: Output is AABCD

Reference: https://www.tutorialspoint.com/java/util/arrays_aslist.htm

Given the code fragment:

What is the result?

[x, x]
[x, x, x, x]
[x, x]
[x]
[x, x]
[x, x, x]
[x]
[x, x]
[x, x, x]
[x, x, x, x]

Correct answer: D

Explanation:

CyclicBarrier is a synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point. CyclicBarriers are useful in programs involving a fixed sized party of threads that must occasionally wait for each other. The barrier is called cyclic because it can be re-used after the waiting threads are released. Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html

CyclicBarrier is a synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point. CyclicBarriers are useful in programs involving a fixed sized party of threads that must occasionally wait for each other. The barrier is called cyclic because it can be re-used after the waiting threads are released.

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html

In 2015. daylight saving time in New York, USA, begins on March 8th at 2:00 AM. As a result, 2:00 AM becomes 3:00 AM.

Given the code fragment:

Which is the result?

2:00 – difference: 1
3:00 – difference: 2
4:00 – difference: 3
4:00 – difference: 2

Correct answer: D

Explanation:

Reference: http://docs.oracle.com/javase/8/docs/api/java/time/ZoneId.html

Given the code fragment:

What is the result?

A compilation error occurs.
An IllegalStateException is thrown at run time.
Tom, Hello
Joe, Hello
Tom,
Joe,

Correct answer: C

Explanation:

Output:Tom,Hello Joe,Hello

Output:

Tom,Hello

Joe,Hello

Vendor:	Oracle
Exam Code:	1z0-813
Exam Name:	Upgrade to Java SE 8 OCP
Date:	Feb 19, 2019
File Size:	4 MB

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