Oracle 1Z0-819 Free Practice Questions

NEW QUESTION 1
Given:

Which annotation should be used to remove warnings from compilation?

• A. @SuppressWarnings on the main and print methods
• B. @SuppressWarnings(“unchecked”) on main and @SafeVarargs on the print method
• C. @SuppressWarnings(“rawtypes”) on main and @SafeVarargs on the print method
• D. @SuppressWarnings(“all”) on the main and print methods

Answer: B

Explanation:

NEW QUESTION 2
Given:

What is the result?

• A. watermelonorangelemongrapeapricotapple
• B. nothing
• C. appleapricotgrapelemonorangewatermelon
• D. appleorangegrapelemonapricotwatermelon

Answer: A

Explanation:

NEW QUESTION 3
Given:

Which two lines inserted in line 1 will allow this code to compile? (Choose two.)

• A. protected void walk(){}
• B. void walk(){}
• C. abstract void walk();
• D. private void walk(){}
• E. public abstract void walk();

Answer: AE

NEW QUESTION 4
Given the declaration:

Examine this code fragment:
/* Loc1 */ class ProcessOrders { ... }
Which two annotations may be applied at Loc1 in the code fragment? (Choose two.)

• A. @Resource(priority=100)
• B. @Resource(priority=0)
• C. @Resource(name=“Customer1”, priority=100)
• D. @Resource(name=“Customer1”)
• E. @Resource

Answer: AB

NEW QUESTION 5
Given:

Which code, when inserted at one or more marked positions, would allow classes B and C to compile?

• A. @Override // position 3void x () {} // position 3@Override // position 3public void z() { } // position 3
• B. @Override // position 2public void z() { } // position 3
• C. implements A // position 1@Override // position 2
• D. public void z() { } // position 3

Answer: B

NEW QUESTION 6
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 7
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 8
Given:

What is the output?

• A. I am an object array
• B. The compilation fails due to an error in line 1.
• C. I am an array
• D. I am an object

Answer: D

NEW QUESTION 9
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 10
Given:

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

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

Answer: D

NEW QUESTION 11
Given:

Which three actions implement Java SE security guidelines? (Choose three.)

• A. Change line 7 to return names.clone();.
• B. Change line 4 to this.names = names.clone();.
• C. Change the getNames() method name to get$Names().
• D. Change line 6 to public synchronized String[] getNames() {.
• E. Change line 2 to private final String[] names;.
• F. Change line 3 to private Secret(String[] names) {.
• G. Change line 2 to protected volatile String[] names;.

Answer: EFG

NEW QUESTION 12
Given:

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

• A. After Line 4, add indexReader.close().
• B. On Line 3, enclose processData(dataReader) with try with resources.
• C. After Line 3, add dataReader.close().
• D. On Line 1, use try with resources when opening each dataReader.
• E. Before Line 1, check the size of dataFiles to make sure it does not exceed a threshold.

Answer: B

NEW QUESTION 13
Given:
var fruits = List.of(“apple”, “orange”, “banana”, “lemon”);
You want to examine the first element that contains the character n. Which statement will accomplish this?

• A. String result = fruits.stream().filter(f > f.contains(“n”)).findAny();
• B. fruits.stream().filter(f > f.contains(“n”)).forEachOrdered(System.out::print);
• C. Optional result = fruits.stream().filter(f > f.contains (“n”)).findFirst ();
• D. Optional result = fruits.stream().anyMatch(f > f.contains(“n”));

Answer: B

Explanation:

NEW QUESTION 14
Which statement about access modifiers is correct?

• A. An instance variable can be declared with the static modifier.
• B. A local variable can be declared with the final modifier.
• C. An abstract method can be declared with the private modifier.
• D. An inner class cannot be declared with the public modifier.
• E. An interface can be declared with the protected modifier.

Answer: B

NEW QUESTION 15
Given:

Which statement is true?

• A. Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.
• B. All classes from the package java.tim
• C. are loaded for the class Diary.
• D. Only LocalDate class from java.time package is loaded.
• E. Tester must import java.time.LocalDate in order to compile.

Answer: A

NEW QUESTION 16
Which two statements are correct about try blocks? (Choose two.)

• A. A try block can have more than one catch block.
• B. A finally block in a try-with-resources statement executes before the resources declared are closed.
• C. A finally block must be immediately placed after the try or catch blocks.
• D. A try block must have a catch block and a finally block.
• E. catch blocks must be ordered from generic to specific exception types.

Answer: AC

NEW QUESTION 17
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 18
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