[2026] Valid 1Z0-819 test answers & Oracle 1Z0-819 exam pdf
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NEW QUESTION # 71
Given the code fragment:
What is the result?
- A. false true true
- B. true false false
- C. false false true
- D. false true false
Answer: D
Explanation:
NEW QUESTION # 72
A)
B)
C)
D)
- A. Option A
- B. Option B
- C. Option D
- D. Option C
Answer: C
NEW QUESTION # 73
Given:
Which statement on line 1 enables this code fragment to compile?
- A. Function function = String::toUpperCase;
- B. Function<String> function = m > m.toUpperCase();
- C. UnaryOperator function = s > s.toUpperCase();
- D. UnaryOperator<String> function = String::toUpperCase;
Answer: D
Explanation:
NEW QUESTION # 74
Given the code fragment:
public void foo(Function<Integer, String> fun) {...}
Which two compile? (Choose two.)
- A. foo( toHexString )
- B. foo( n -> n + 1 )
- C. foo( (int n) -> Integer.toHexString(n) )
- D. foo( int n -> Integer.toHexString(n) )
- E. foo( n -> Integer::toHexString )
- F. foo( n::toHexString )
- G. foo( Integer::toHexString )
- H. foo( n -> Integer.toHexString(n) )
Answer: B,H
Explanation:
Explanation/Reference:
NEW QUESTION # 75
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?
- A. An exception is thrown at run time.
- B. [Peter, 30, Market Road]
- C. [Market Road, 1000]
- D. [Peter, 25, null, 1000]
Answer: A
Explanation:
NEW QUESTION # 76
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. javac -d /code /code/a/Test.java /code/b/Best.java
- B. java /code/a/Test.java
- C. javac -d /code /code/a/Test
- D. java /code/a/Test.java /code/b/Best.java
- E. java -cp /code a.Test
- F. javac -d /code /code/a/Test.java
Answer: A
NEW QUESTION # 77
Given:
What is the result?
- A. 5 12
- B. compilation error
- C. 0 5
- D. 6 13
Answer: B
Explanation:
NEW QUESTION # 78
Given:
When is the readObject method called?
- A. The method is never called.
- B. before this object is deserialized
- C. before this object Is serialized
- D. after this object is deserialized
- E. after this object is serialized
Answer: D
NEW QUESTION # 79
Given:
What is the result?
- A. null
- B. p1
- C. The compilation fails due to an error in line 1.
- D. Joe Bloggs
Answer: C
Explanation:
NEW QUESTION # 80
Given:
Automobile.java
Car.java
What must you do so that the code prints 4?
- A. Replace the code in line 2 with Car ob = new Car();
- B. Remove the parameter from wheels method in line 3.
- C. Remove abstract keyword in line 1.
- D. Add @Override annotation in line 2.
Answer: D
Explanation:
NEW QUESTION # 81
Given the declaration:
In which two locations is it legal to apply the @Resource annotation?
- A. Loc2
- B. Loc3
- C. Loc2
- D. Loc1
- E. Loc4
Answer: B,C
NEW QUESTION # 82
Given:
What is the type of the local variable x?
- A. String
- B. String[ ]
- C. Character
- D. char
Answer: A
NEW QUESTION # 83
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(); Greeting myG = new Greeting(); myG.sayHi ();
- C. Hello myH = new Hello();
Hello.Greeting myG = myH.new Hello.Greeting();
myG.sayHi(); - D. Hello myH = new Hello();
Hello.Greeting myG = myH.new Greeting();
myG.sayHi();
Answer: D
NEW QUESTION # 84
Given:
and
Which two method definitions at line n1 in the Bar class compile? (Choose two.)
- A. public List<Integer> foo(Set<CharSequence> m) {...}
- B. public ArrayList<Integer> foo(Set<String> m) {...}
- C. public ArrayList<Number> foo(Set<CharSequence> m) {...}
- D. public List<Object> foo(Set<CharSequence> m) {...}
- E. public List<Number> foo(Set<String> m) {...}
- F. public List<Integer> foo(TreeSet<String> m) {...}
Answer: C,F
NEW QUESTION # 85
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. The compilation fails.
- C. Only reader1 has been closed.
- D. All three readers have been closed.
Answer: B
NEW QUESTION # 86
A bookstore's sales are represented by a list of Sale objects populated with the name of the customer and the books they purchased.
public class Sale {
private String customer;
private List<Book> items;
// constructor, setters and getters not shown
}
public class Book {
private String name;
private double price;
// constructor, setters and getters not shown
}
Given a list of Sale objects, tList, which code fragment creates a list of total sales for each customer in ascending order?
- A. Option A
- B. Option C
- C. Option B
- D. Option D
Answer: B
NEW QUESTION # 87
Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:
What security measures should be added to this method so that it meets the requirements for a customer accessible method?
- A. Create a method that validates the hostName and portNumber parameters before opening the socket.
- B.
- C. Enclose the call to new Socket In an AccessController.doPrivileged block.
- D. Make enableService private.
Answer: C
NEW QUESTION # 88
Given:
What is required to make the Foo class thread safe?
- A. Make the declaration of lock static.
- B. Move the declaration of lock inside the foo method.
- C. No change is required.
- D. Replace the lock constructor call with new ReentrantLock (true).
Answer: D
Explanation:
Reference:
/how-to-make-java-class-thread-safe
NEW QUESTION # 89
......
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