Download Oracle 1Z0-819 Practice Online

NEW QUESTION 1
Given:

Assume the file on path does not exist. What is the result?

• A. The compilation fails.
• B. /u01/work/filestore.txt is not deleted.
• C. Exception
• D. /u01/work/filestore.txt is deleted.

Answer: A

Explanation:

NEW QUESTION 2
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 3
Which three guidelines are used to protect confidential information? (Choose three.)

• A. Limit access to objects holding confidential information.
• B. Clearly identify and label confidential information.
• C. Manage confidential and other information uniformly.
• D. Transparently handle information to improve diagnostics.
• E. Treat user input as normal information.
• F. Validate input before storing confidential information.
• G. Encapsulate confidential information.

Answer: ADF

NEW QUESTION 4
Given:
/code/a/Test.java containing:

and
/code/b/Best.java containing: package b;
public class Best { }
Which is the valid way to generate bytecode for all classes?

• A. java /code/a/Test.java
• B. javac –d /code /code/a/Test
• C. java /code/a/Test.java /code/b/Best.java
• D. java –cp /code a.Test
• E. javac –d /code /code/a/Test.java /code/b/Best.java
• F. javac –d /code /code/a/Test.java

Answer: E

NEW QUESTION 5
Given:

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

• A. setAllCounts
• B. setACount
• C. setGCount
• D. setCCount
• E. setTCount

Answer: AC

NEW QUESTION 6
Given:

Which is true?

• A. System.out is the standard output strea
• B. The stream is open only when System.out is called.
• C. System.in cannot reassign the other stream.
• D. System.out is an instance of java.io.OutputStream by default.
• E. System.in is the standard input strea
• F. The stream is already open.

Answer: D

NEW QUESTION 7
Given:

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

• A. Hello.Greeting myG = new Hello.Greeting() myG.sayHi();
• B. Hello myH = new Hello();Hello.Greeting myG = myH.new Greeting(); myG.sayHi();
• C. Hello myH = new Hello();Hello.Greeting myG = myH.new Hello.Greeting(); myG.sayHi();
• D. Hello myH = new Hello(); Greeting myG = new Greeting(); myG.sayHi ();

Answer: B

NEW QUESTION 8
Consider this method declaration:

A) “SET SESSION AUTHORIZATION “ + user
B) “SET SESSION AUTHORIZATION “ + stmt.enquoteIdentifier(user) Is A or B the correct replacement for <EXPRESSION> and why?

• A. A, because it sends exactly the value of user provided by the calling code.
• B. B, because enquoting values provided by the calling code prevents SQL injection.
• C. A and B are functionally equivalent.
• D. A, because it is unnecessary to enclose identifiers in quotes.
• E. B, because all values provided by the calling code should be enquoted.

Answer: A

NEW QUESTION 9
Which code fragment prints 100 random numbers?

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

Answer: D

NEW QUESTION 10
Given the Person class with age and name along with getter and setter methods, and this code fragment:

What will be the result?

• A. Aman Tom Peter
• B. Tom Aman Peter
• C. Aman Peter Tom
• D. Tom Peter Aman

Answer: C

NEW QUESTION 11
Given:

executed using command:
java Hello “Hello World” Hello World What is the output?

• A. An exception is thrown at runtime.
• B. Hello WorldHello World
• C. Hello World Hello World
• D. Hello WorldHelloWorld
• E. HelloHello WorldHelloWorld

Answer: C

NEW QUESTION 12
Given:

What is the type of the local variable x?

• A. Character
• B. char
• C. String[ ]
• D. String

Answer: D

NEW QUESTION 13
Given:

Which two lines cause compilation errors? (Choose two.)

• A. line 12
• B. line 6
• C. line 9
• D. line 8
• E. line 7

Answer: BE

NEW QUESTION 14
Which command line runs the main class com.acme.Main from the module com.example?

• A. java --module-path mods com.example/com.acme.Main
• B. java –classpath com.example.jar com.acme.Main
• C. java --module-path mods -m com.example/com.acme.Main
• D. java -classpath com.example.jar –m com.example/com.acme.Main

Answer: D

NEW QUESTION 15
Given:

You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?

• A. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));
• B. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
• C. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
• D. Stream<String> lines = Files.lines(INPUT_FILE_NAME);

Answer: C

NEW QUESTION 16
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