Top Tips Of Latest 1Z0-819 Pdf Exam

NEW QUESTION 1
Given the code fragment:

What is the result?

• A. 01
• B. 1
• C. The program prints nothing.
• D. It prints 1 in the infinite loop.

Answer: D

NEW QUESTION 2
Which is the correct order of possible statements in the structure of a Java class file?

• A. class, package, import
• B. package, import, class
• C. import, package, class
• D. package, class, import
• E. import, class, package

Answer: B

NEW QUESTION 3
Which is a proper JDBC URL?

• A. jdbe.mysql.com://localhost:3306/database
• B. http://localhost.mysql.com:3306/database
• C. http://localhostmysql.jdbc:3306/database
• D. jdbc:mysql://localhost:3306/database

Answer: D

NEW QUESTION 4
Which describes a characteristic of setting up the Java development environment?

• A. Setting up the Java development environment requires that you also install the JRE.
• B. The Java development environment is set up for all operating systems by default.
• C. You set up the Java development environment for a specific operating system when you install the JDK.
• D. Setting up the Java development environment occurs when you install an IDE before the JDK.

Answer: D

NEW QUESTION 5
Given:

What is the result?

• A. 2,34,34,5
• B. 2,34,54,5
• C. 2,54,54,5
• D. 2,34,54,3

Answer: C

Explanation:

NEW QUESTION 6
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?

• A. setLeft and setRight must be protected.
• B. left and right must be private.
• C. isValid must be public.
• D. left, right, setLeft, and setRight must be private.

Answer: B

NEW QUESTION 7
Given:

What is the result?

• A. 42
• B. The compilation fails due to an error in line 4.
• C. 17
• D. The compilation fails due to an error in line 3.
• E. The compilation fails due to an error in line 2.
• F. The compilation fails due to an error in line 1.
• G. The compilation fails due to an error in line 5.

Answer: A

NEW QUESTION 8
Which two statements independently compile? (Choose two.)

• A. List<? super Short> list = new ArrayList<Number>();
• B. List<? super Number> list = new ArrayList<Integer>();
• C. List<? extends Number> list = new ArrayList<Byte>();
• D. List<? extends Number> list = new ArrayList<Object>();
• E. List<? super Float> list = new ArrayList<Double>();

Answer: AC

Explanation:

NEW QUESTION 9
Given:

After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

• A. after line 8
• B. after line 6
• C. after line 5
• D. after line 10

Answer: B

Explanation:

NEW QUESTION 10
Analyze the code:

Which two options can you insert inside println method to produce Global:namescope? (Choose two.)

• A. Test.prefix+Test.name
• B. new Test().prefix+new Test().name
• C. Test.prefix+Test.getName()
• D. Test.getName+prefix
• E. prefix+Test.name
• F. prefix+name

Answer: BC

NEW QUESTION 11
Given:

Which two are secure serialization of these objects? (Choose two.)

• A. Define the serialPersistentFields array field.
• B. Declare fields transient.
• C. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
• D. Make the class abstract.
• E. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.

Answer: AC

NEW QUESTION 12
Given:

Which two methods facilitate valid ways to read instance fields? (Choose two.)

• A. getTCount
• B. getACount
• C. getTotalCount
• D. getCCount
• E. getGCount

Answer: CD

NEW QUESTION 13
Given:

executed using this command: java Myclass My Car is red What is the output of this class?

• A. Car--red--My
• B. My--Car--is
• C. My--is--java
• D. java--Myclass--My
• E. Myclass--Car--red

Answer: A

NEW QUESTION 14
Which describes an aspect of Java that contributes to high performance?

• A. Java prioritizes garbage collection.
• B. Java has a library of built-in functions that can be used to enable pipeline burst execution.
• C. Java monitors and optimizes code that is frequently executed.
• D. Java automatically parallelizes code execution.

Answer: C

NEW QUESTION 15
Given:

This code results in a compilation error.
Which code should be inserted on line 1 for a successful compilation?

• A. Consumer consumer = msg -> { return System.out.print(msg); };
• B. Consumer consumer = var arg > {System.out.print(arg);};
• C. Consumer consumer = (String args) > System.out.print(args);
• D. Consumer consumer = System.out::print;

Answer: D

Explanation:

NEW QUESTION 16
Given:

When run and all three files exist, what is the state of each reader on Line 1?

• A. All three readers are still open.
• B. All three readers have been closed.
• C. The compilation fails.
• D. Only reader1 has been closed.

Answer: C

NEW QUESTION 17
Which two are successful examples of autoboxing? (Choose two.)

• A. String a = “A”;
• B. Integer e = 5;
• C. Float g = Float.valueOf(null);
• D. Double d = 4;
• E. Long c = 23L;
• F. Float f = 6.0;

Answer: AB

NEW QUESTION 18
Given:

Which two statements can be added at line 1 in Bar to successfully compile it? (Choose two.)

• A. public List<Integer> foo(Set<CharSequence> m) { ... }
• B. public ArrayList<Number> foo(Set<CharSequence> m) { ... }
• C. public List<Integer> foo(TreeSet<String> m) { ... }
• D. public List<Integer> foo(Set<String> m) { ... }
• E. public List<Object> foo(Set<CharSequence> m) { ... }
• F. public ArrayList<Integer> foo(Set<String> m) { ... }

Answer: BC

NEW QUESTION 19
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