1z0-819 Java SE 11 Developer Questions and Answers

jdbe.mysql.com://localhost:3306/database

http://localhost.mysql.com:3306/database

http://localhost mysql.jdbc:3306/database

jdbc:mysql://localhost:3306/database

The compilation fails.

1) one2) two3) three

A java.lang.ArrayIndexOutOfBoundsException is thrown.

1) one

nothing

Option A

Option B

Option C

Option D

Option E

Option F

300

Exception

200

100

System.out is the standard output stream. The stream is open only when System.out is called.

System.in cannot reassign the other stream.

System.out is an instance of java.io.OutputStream by default.

System.in is the standard input stream. The stream is already open.

All three readers are still open.

All three readers have been closed.

The compilation fails.

Only reader1 has been closed.

Option A

Option B

Option C

Option D

Take extra care

The program prints nothing.

Take extra care

Take extra care

An exception is thrown at runtime

You accept the change because -noverify is necessary for your code to run with the latest version of Java.

You reject the change because -Xms8g -Xmx8g uses too much system memory.

You accept the change because -noverify is a standard option that has been supported since Java 1.0.

You reject the change because -noverify is a critical security risk.

privilege escalation attack against the OS running the customer code

SQL injection attack against the specified host and port

XML injection attack against any mlib server

none because the customer code base must also be granted SocketPermission

denial of service attack against any reachable machine

A java.nio.file.FileAlreadyExistsException is thrown on line 1.

A java.nio.file.NoSuchFileException is thrown on line 2.

A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.

a.txt is renamed repo.

MyInterface1

MyInterface3

MyInterface5

MyInterface2

MyInterface4

2134

2143

214

234

java /code/a/Test.java

javac –d /code /code/a/Test

java /code/a/Test.java /code/b/Best.java

java –cp /code a.Test

javac –d /code /code/a/Test.java /code/b/Best.java

javac –d /code /code/a/Test.java

Insert Comparator on line 1.

Insert

public int compare(Person p1, Person p2) {

return p1.name.compare(p2.name);

}

on line 2.

Insert Comparator on line 1.

Insert

public int compareTo(Person person) {

return person.name.compareTo(this.name);

}

on line 2.

Insert Comparable on line 1.

Insert

public int compare(Person p1, Person p2) {

return p1.name.compare(p2.name);

}

on line 2.

Insert Comparator on line 1.

Insert

public int compare(Person person) {

return person.name.compare(this.name);

}

on line 2.

Option A

Option B

Option C

Option D

Option E

Option F

Option A

Option B

Option C

Option D

6910 3

10126 3

3

6104 3

Joe

null

null

Mary

Joe

Marry

null

null

Runnable r = “Message” −> System.out.println();

Runnable r = () −> System.out::print;

Runnable r = () -> {System.out.println(“Message”);};

Runnable r = −> System.out.println(“Message”);

Runnable r = {System.out.println(“Message”)};

The code compiles but does not print any result.

The code prints 25.

The code does not compile.

The code throws an exception at runtime.

[Lettuce, Kale]

A compilation error is thrown.

[Lettuce, Kale]

[Seabass, Salmon]

[Kale, Lettuce]

[Salmon, Seabass]

java.logging

java.desktop

javafx

jdk.httpserver

jdk.jartool

null

Joe Bloggs

The compilation fails due to an error in line 1.

p1

A compilation error is thrown.

Message from Copier: Attempt00

Message from Abstract Copier: Attempt00

A runtime error is thrown.

A ClassCastException is thrown at runtime.

AnotherClass#methodA()AnotherClass#methodA()

The compilation fails.

SomeClass#methodA()AnotherClass#methodA()

AnotherClass#methodA()SomeClass#methodA()

SomeClass#methodA()SomeClass#methodA()

Option A

Option B

Option C

Option D

Dr. Who

Dr. Null

An exception is thrown at runtime.

null

The compilation fails.

[-1, -2, -3]

[-3, -2, -1]

A runtime exception is thrown.

385

3

The compilation fails.

80

25

inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', NULL)

inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', 'HR')

inserts one row (101, 'SMITH', 'HR')

throws a SQLException

Map: 0 Keys: 0 Values: 0

The compilation fails.

Map: 4 Keys: 4 Values: 4

Map: 4 Keys: 0 Values: 0

Map: 0 Keys: 4 Values: 4

Option A

Option B

Option C

Option D

The compilation fails because there is no zero args constructor defined in class X.

The compilation fails because either class X or class Y needs to implement the toString() method.

The compilation fails because a final class cannot extend another class.

The compilation succeeds.

Configuration is OK

The compilation fails.

Exception in thread "main" java.lang.Error:Fatal Error: Configuration File, App.config, is missing.

nothing