[Dec 04, 2023] Today Updated 1z1-819 Exam Dumps Actual Questions [Q70-Q94]

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[Dec 04, 2023] Today Updated 1z1-819 Exam Dumps Actual Questions

1z1-819 exam dumps with real Oracle questions and answers

The Oracle 1z1-819 exam covers a wide range of topics, including Java language fundamentals, object-oriented programming, concurrency, JDBC, and modular programming. It also tests developers’ ability to develop robust and secure applications using the latest Java SE 11 features and APIs.

Q70. Given the code fragment:

What is the result?

13 5 7 9

1 3 5 7 9 11

2 4 6 B 10

2 4 6 8

Q71. Given the code fragment:

What is the result?

-1 : 2

2 : -1

2 : 3

3 : 0

Q72. Given:

and

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

Option A

Option B

Option C

Option D

Q73. Given the code fragment:

What is the result?

An ArrayIndexOutofBoundsException is thrown at runtime.

The compilation fails.

gh ij kl

gj hk il

ghi jkl

Q74. Given:

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

All three readers are still open.

All three readers have been closed.

The compilation fails.

Only reader1 has been closed.

Q75. Given:

What is the result?

The compilation fails due to an error in line 1.

Q76. Given:

Which would cause s to be AQCD?

s.replace(s.indexOf(“A”), s.indexOf(“C”), “Q”);

s.replace(s.indexOf(“B”), s.indexOf(“C”), “Q”);

s.replace(s.indexOf(“B”), s.indexOf(“B”), “Q”);

s.replace(s.indexOf(“A”), s.indexOf(“B”), “Q”);

Q77. Given:

What is the result?

2134

2143

214

234

Q78. Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?

module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi;
}

module PrintServiceProvider {
requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
}

module PrintServiceProvider {
requires PrintServiceAPI;
uses com.provider.PrintService;
}

module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi.Print with
D18912E1457D5D1DDCBD40AB3BF70D5D
com.provider.PrintService;

}

Q79. Given:

Which is true?

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.

Q80. Given:

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

0). one

0). one1). two2). three

The compilation fails.

It creates an infinite loop printing:0). one1). two1). two…

A java.lang.NullPointerException is thrown.

Q81. Which is the correct order of possible statements in the structure of a Java class file?

class, package, import

package, import, class

import, package, class

package, class, import

import, class, package

Q82. Given:

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

setAllCounts

setACount

setGCount

setCCount

setTCount

Q83. Given:

Which three classes successfully override printOne()? (Choose three.)

Option A

Option B

Option C

Option D

Option E

Option F

Q84. Given:

What is the result?

Orange Juice

The compilation fails.

Orange Juice Apple Pie Lemmon Ice Raspberry Tart

The program prints nothing.

Q85. Given:

What is the result?

The compilation fails at line 9.

The compilation fails at line 2.

Hello World

The compilation fails at line 8.

Q86. 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.

Q87. 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.

Q88. Given:

What will secure this code from a potential Denial of Service condition?

After Line 4, add indexReader.close().

On Line 3, enclose processData(dataReader) with try with resources.

After Line 3, add dataReader.close().

On Line 1, use try with resources when opening each dataReader.

Before Line 1, check the size of dataFiles to make sure it does not exceed a threshold.

Q89. 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)

Option A

Option B

Option C

Option D

Q90. Given:

What is the expected result of javac?

javac fails to compile the class and prints the error message, C:workspace4Mycar.java:1:error: package java does not exist

javac compiles Mycar.java without errors or warnings.

javac fails to compile the class and prints the error message, C:workspace4Mycar.java:1:error:
expected import java.lang

javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class

Q91. Given:

What is the output?

A compilation error is thrown.

Message from Copier: Attempt00

Message from Abstract Copier: Attempt00

A runtime error is thrown.

Q92. Given:
var data = new ArrayList<>();
data.add(“Peter”);
data.add(30);
data.add(“Market Road”);
data.set(1, 25);
data.remove(2);
data.set(3, 1000L);
System.out.print(data);
What is the output?

[Market Road, 1000]

[Peter, 30, Market Road]

[Peter, 25, null, 1000]

An exception is thrown at run time.