[Oct-2024] 1Z0-819 Exam Questions and Valid 1Z0-819 Dumps PDF [Q135-Q157]

[Oct-2024] 1Z0-819 Exam Questions and Valid 1Z0-819 Dumps PDF

1Z0-819 Brain Dump: A Study Guide with Tips & Tricks for passing Exam

The Oracle 1Z0-819 exam covers a range of topics including Java fundamentals, object-oriented programming concepts, exceptions, concurrency, and collections, among others. It also tests candidates' ability to write code, debug and troubleshoot programs, and use various Java technologies and tools.

 

NEW QUESTION # 135
Given the code fragment:

Which "for" loop produces the same output?

• A. Option A
• B. Option C
• C. Option D
• D. Option B

Answer: B

NEW QUESTION # 136
Given:

What is the result?

• A. 0
• B. 1
• C. It fails to compile.
• D. A java.lang.IllegalArgumentException is thrown.
• E. nothing

Answer: C

Explanation:

NEW QUESTION # 137
Given:
jdeps -jdkinternals C:\workspace4\SimpleSecurity\jar\classes.jar
Which describes the expected output?

• A. The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.
• B. The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
• C. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.
• D. jdeps outputs an error message that the -jdkinternals option requires either the -summary or the - verbose options to output to the console.

Answer: B

Explanation:
Explanation
-jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

NEW QUESTION # 138
Given:

executed with this command:
java Main one two three
What is the result?

• A. The compilation fails.
• B. 0). one1). two2). three
• C. A java.lang.NullPointerException is thrown.
• D. 0). one
• E. It creates an infinite loop printing:0). one1). two1). two...

Answer: E

NEW QUESTION # 139
Given:

Which expression when added at line 1 will produce the output of 1.17?

• A. float z = Math.round((float)x/y,2);
• B. float z = Math.round((float)x/y*100)/(float)100;
• C. float z = Math.round((int)(x/y),2);
• D. float z = (float)(Math.round((float)x/y*100)/100);

Answer: B

Explanation:

NEW QUESTION # 140
Given the code fragment:

You want to examine whether path is a directory.
Which code inserted on line 1 will accomplish this?

• A. BasicFileAttributes attributes = Files.readAttributes(path, BasicFileAttributes.class
• B. BasicFileAttributes attributes = Files, readAttributes (path, FileAttributes, class);
• C. BasicFileAttributes attributes = Files isDirectory (path);
• D. BasicFileAttributes attributes =Files.getAttribute (path, ''insdirectory'');

Answer: B

NEW QUESTION # 141
Which two commands are used to identify class and module dependencies? (Choose two.)

• A. java --show-module-resolution
• B. jar --show-module-resolution
• C. java Hello.java
• D. jdeps --list-deps
• E. jmod describe

Answer: A,D

NEW QUESTION # 142
Given
:

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

B)

C)

• A. Option C
• B. Option B
• C. Option A

Answer: C

NEW QUESTION # 143
Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

• A. Locale.setDefault(Locale.Category.FORMAT, "zh-CN");
• B. Locale.setDefault("en_CA");
• C. Locale.setDefault(Locale.Category.FORMAT, Locale.CANADA_FRENCH);
• D. Locale.setDefault(Locale.SIMPLIFIED_CHINESE);
• E. Locale.setDefault("es", Locale.US);

Answer: B,C

NEW QUESTION # 144
Given:

What is the result?
A)

B)

C)

D)

• A. Option C
• B. Option D
• C. Option B
• D. Option A

Answer: D

NEW QUESTION # 145
A company has an existing sales application using a Java 8 jar file containing packages:
com.company.customer;
com.company.customer.orders;
com.company.customer.info;
com.company.sales;
com.company.sales.leads;
com.company.sales.closed;
com.company.orders;
com.company.orders.pending;
com.company.orders.shipped.
To modularize this jar file into three modules, customer, sales, and orders, which module-info.java would be correct?
A)

B)

C)

D)

• A. Option A
• B. Option C
• C. Option D
• D. Option B

Answer: B

NEW QUESTION # 146
Given:

and
checkQuality(QUALITY.A);
and

Which code fragment can be inserted into the switch statement to print Best?

• A. QUALITY.A
• B. QUALITY.A.ValueOf()
• C. A.toString()
• D. A

Answer: D

NEW QUESTION # 147
Given:

What is known about the Sportscar class?

• A. The Sportscar class is a subclass of Automobile and inherits its methods.
• B. The Sportscar subclass cannot override setTurbo method from the superclass Automobile.
• C. The Sportscar class is a superclass that has more functionality than the Automobile class.
• D. The Sportscar class inherits the setTurbo method from the superclass Automobile.

Answer: A

NEW QUESTION # 148
Given:

and

Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1, 1989?

• A. Option B
• B. Option A
• C. Option C
• D. Option D

Answer: A

NEW QUESTION # 149
Given:

And the commands:
What is the result on execution of these commands?

• A.
• B.
• C.
• D.

Answer: B

NEW QUESTION # 150
Given:

and

What is the result?

• A. A ClassCastException is thrown at run time.
• B. A NullPointerException is thrown at run time.
• C. 1
  Null
  null
• D. 1
  1
  1
• E. The compilation fails.

Answer: E

Explanation:

NEW QUESTION # 151
Given the code fragment:

What is the result?

• A.
• B.
• C.
• D.

Answer: C

NEW QUESTION # 152
Given:

What is the result?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: A

Explanation:

NEW QUESTION # 153
Given an application with a main module that has this module-info.java file:

Which two are true? (Choose two.)

• A. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
• B. An implementation of country.countryDetails can be added to the main module.
• C. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.
• D. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
• E. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.

Answer: D,E

Explanation:
Reference:
/java-9-error-not-in-a-module-on-the-module-source- path

NEW QUESTION # 154
Given:

What is the result?

• A. Joenull
• B. nullMary
• C. JoeMarry
• D. nullnull

Answer: B

Explanation:

NEW QUESTION # 155
Given this requirement:
Module vehicle depends on module part and makes its com.vehicle package available for all other modules.
Which module-info.java declaration meets the requirement?

• A. Option C
• B. Option D
• C. Option B
• D. Option A

Answer: D

NEW QUESTION # 156
What is the result?

• A. Compilations fails at Line 1.
• B. 9001: APPLICATION ERROR-9001-MyFile.txt
• C. 9001: APPLICATION ERROR-9001-MyFile.txt
  9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt
• D. 9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt

Answer: A

NEW QUESTION # 157
......

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