Updated Nov 14, 2024 Certification Exam 1z1-819 Dumps – Practice Test Questions [Q132-Q147]

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Updated Nov 14, 2024 Certification Exam 1z1-819 Dumps – Practice Test Questions

Updated Verified 1z1-819 dumps Q&As – Pass Guarantee or Full Refund

Q132. Which command line runs the main class com.acme.Main from the module com.example?

java –module-path mods com.example/com.acme.Main

java -classpath com.example.jar com.acme.Main

java –module-path mods -m com.example/com.acme.Main

java -classpath com.example.jar -m com.example/com.acme.Main

Q133. Which two safely validate inputs? (Choose two.)

Delegate numeric range checking of values to the database.

Accept only valid characters and input values.

Use trusted domain-specific libraries to validate inputs.

Assume inputs have already been validated.

Modify the input values, as needed, to pass validation.

Q134. Given:

What is the result?

The compilation fails due to an error in line 1.

Q135. Given the code fragment:

What is the result?

The program prints nothing.

It prints 1 in infinite loop.

Q136. Given:

It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?

setLeft and setRight must be protected.

left and right must be private.

isValid must be public.

left, right, setLeft, and setRight must be private.

Q137. Given:

and

What is the result?

A NullPointerException is thrown at run time.

The compilation fails.

1
Null
null

1
1
1

A ClassCastException is thrown at run time.

Q138. Given:

You wants to make the reduction operation parallelized.
Which two modifications will accomplish this?

Replace line 1 with int sum = numbers. Stream (). Interate (0, a -> a+1. Reduce (0, (n m) -> n+m);

Replace line 1with int sum = numbers. ParallelStream ( ). Reduce (0, (n, m ) -> n + m);

Replace line 1 with int sum = numbers. Parallel ( ). Stream ( ). Reduce (0, (n, m ) -> n + m);

Replace line 1with int sum = number. Stream ( ) . flatMap (a -> a) .reduce (0, (n, m) -> n +m );

Replace line 1with int sum = number.stream. parallel ( ). Reduce (0, (n, m) -> n + m);

Q139. Given:

Which statement is true?

The code compiles successfully.

The code fails to compile as res2 should be declared as final.

The code fails to compile as MyResource must implement Closeable.

The code fails to compile as try-try-resource needs a variable declaration such as MyResource r1= res1; MyResource r2 = res2;.

Q140. Given the code fragment:

What is the output?

Null

Def 42

41 def 42

An exception is thrown at runtime

Q141. Given:

and the commands:

What is the result on execution of these commands?
Test.class – > java.sql -> java.base

On execution, the jdepscommand displays an error.
Test.class -> java.base

Test.class – > java.sql
Test.class -> java.base

Test.class – > java.sql
java.sql -> java.base

Q142. Given:

Which two methods modify field values? (Choose two.)

setAllCounts

setACount

setGCount

setCCount

setTCount

Q143. Given:

What is required to make the Foo class thread safe?

No change is required.

Make the declaration of lock static.

Replace the lock constructor call with new ReentrantLock (true).

Move the declaration of lock inside the foo method.

Reference:
/how-to-make-java-class-thread-safe

Q144. Given:

What is the result?

Q145. Given:

What is the result?

2.0

1.0

3.0

The program pints nothing.

An exception is thrown at runtime.

Q146. Given:

What is the correct definition of the JsonField annotation that makes the Point class compile?
A)

B)

C)

Option A

Option B

Option C

Q147. Given:

What code must you insert on Line 1 to enable the code to print Hello world?

Hello.Greeting myG = new Hello.Greeting() myG.sayHi();

Hello myH = new Hello();
Hello.Greeting myG = myH.new Greeting();
myG.sayHi();

Hello myH = new Hello();
Hello.Greeting myG = myH.new Hello.Greeting();
myG.sayHi();

Hello myH = new Hello(); Greeting myG = new Greeting(); myG.sayHi ();

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Oracle 1z1-819 exam is designed to test the skills and knowledge of Java developers who are proficient in Java SE 11. It is a certification exam that is widely recognized in the industry and can help developers advance their careers or find new job opportunities. 1z1-819 exam covers a range of topics related to Java development, including language fundamentals, object-oriented programming, and advanced Java features.

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