Jan-2022 Oracle 1Z0-819 Actual Questions and Braindumps [Q66-Q87]

Jan-2022 Oracle 1Z0-819 Actual Questions and Braindumps

1Z0-819 Dumps To Pass Oracle Exam in 24 Hours - Actual4Exams

Oracle 1Z0-819 Exam Syllabus Topics:

Topic	Details
Topic 1	Deploy and execute modular applications, including automatic modules Implement functional interfaces using lambda expressions
Topic 2	Create and use subclasses and superclasses, including abstract classes Use local variable type inference, including as lambda parameters
Topic 3	Understand variable scopes, apply encapsulation and make objects immutable Connect to and perform database SQL operations, process query results using JDBC API
Topic 4	Develop code that mitigates security threats such as denial of service Use Java Streams to filter, transform and process data
Topic 5	Use primitives and wrapper classes, including, operators, parentheses, type promotion and casting Sort collections and arrays using Comparator and Comparable interfaces
Topic 6	Handle text using String and StringBuilder classes Utilize polymorphism and casting to call methods, differentiate object type versus reference type
Topic 7	Define and use fields and methods, including instance, static and overloaded methods Working with Arrays and Collections
Topic 8	Create and use interfaces, identify functional interfaces Initialize objects and their members using instance and static initialiser statements and constructors
Topic 9	Secure resource access including filesystems, manage policies and execute privileged code Develop thread-safe code, using different locking mechanisms
Topic 10	Implement serialization and deserialization techniques on Java objects Declare and instantiate Java objects including nested class objects

 

NEW QUESTION 66
Given the code fragment:

What change on line 1 will make this code compile?

• A. Add catch (N | L | M e).
• B. Add catch (L e).
• C. Add catch (M |L e).
• D. Add catch (L |N e).
• E. Add catch (L |M N e).

Answer: B

 

NEW QUESTION 67
var numbers = List.of(0,1,2,3,4,5,6,7,8,9);
You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)

• A. double avg = numbers.stream().average().getAsDouble();
• B. double avg = numbers.stream().mapToInt (i > i).average().parallel();
• C. double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));
• D. double avg = numbers.stream().parallel().averagingDouble(a > a);
• E. double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();

Answer: A,E

Explanation:

 

NEW QUESTION 68
Given:

What is the result?

• A. java.lang.IllegalAccessException is thrown.
• B. null
• C. It fails to compile.
• D. nothing
• E. Student

Answer: C

 

NEW QUESTION 69
Given:

Which two codes, independently, can be inserted in line to 1 compile?

• A. Abacus aba = (int e, int f) -> { return e * f; };
• B. Abacus aba = (int m, int n) -> { m * n };
• C. Abacus aba = (a, b) -> a * b;
• D. Abacus aba = v, w -> x * y;
• E. Abacus aba = (int i, j) -> ( return i * j; };

Answer: C,E

 

NEW QUESTION 70
Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?

• A. The compilation fails because either class X or class Y needs to implement the toString() method.
• B. The compilation succeeds.
• C. The compilation fails because a final class cannot extend another class.
• D. The compilation fails because there is no zero args constructor defined in class X.

Answer: A

Explanation:

 

NEW QUESTION 71
Given:

and
checkQuality(QUALITY.A);
and

Which code fragment can be inserted into the switch statement to print Best?

• A. QUALITY.A
• B. A
• C. A.toString()
• D. QUALITY.A.ValueOf()

Answer: B

 

NEW QUESTION 72
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. java /code/a/Test.java /code/b/Best.java
• C. javac -d /code /code/a/Test.java /code/b/Best.java
• D. java -cp /code a.Test
• E. javac -d /code /code/a/Test.java
• F. javac -d /code /code/a/Test

Answer: C

 

NEW QUESTION 73
Given:

What is the result?

• A. 3 3 3 3
• B. 5 5 3 3
• C. 3 5 3 5
• D. 3 5 3 3

Answer: D

Explanation:

 

NEW QUESTION 74
Given:

What is the expected result of javac?

• A. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class
• B. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist
• C. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error:
  expected import java.lang
• D. javac compiles Mycar.java without errors or warnings.

Answer: D

 

NEW QUESTION 75
Which is the correct order of possible statements in the structure of a Java class file?

• A. package, import, class
• B. class, package, import
• C. package, class, import
• D. import, package, class
• E. import, class, package

Answer: A

 

NEW QUESTION 76
Given:

Which one is correct?

• A. Three threads are created.
• B. Four threads are created.
• C. The compilation fails.
• D. An IllegalThreadStateException is thrown at run time.

Answer: D

Explanation:

 

NEW QUESTION 77
Given:

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

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

Answer: B,D

 

NEW QUESTION 78
Given:

Which two statements are valid to be written in this interface? (Choose two.)

• A. public abstract void methodB();
• B. public void methodF(){System.out.println("F");}
• C. private abstract void methodC();
• D. final void methodE();
• E. public String methodD();
• F. final void methodG(){System.out.println("G");}
• G. public int x;

Answer: A,E

 

NEW QUESTION 79
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 80
Given:

Which two statements are valid to be written in this interface? (Choose two.)

• A. public abstract void methodB();
• B. public void methodF(){System.out.println("F");}
• C. private abstract void methodC();
• D. final void methodE();
• E. public String methodD();
• F. final void methodG(){System.out.println("G");}
• G. public int x;

Answer: A,E

 

NEW QUESTION 81
Given the code fragment:

What is the result?

• A. 0
• B. It prints 1 in the infinite loop.
• C. 1
• D. 01
• E. The program prints nothing.

Answer: E

 

NEW QUESTION 82
Given:

Which two method implementations are correct, when inserted independently in line 1? (Choose two.)

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

Answer: A,C

 

NEW QUESTION 83
Given:

You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?

• A. Implement AutoCloseable and override the autoClose method.
• B. Extend AutoCloseable and override the autoClose method.
• C. Extend AutoCloseable and override the close method.
• D. Implement AutoCloseable and override the close method.

Answer: D

 

NEW QUESTION 84
Given:

What is the result?

• A. 0
• B. 1
• C. 2
• D. 3
• E. 4

Answer: B

 

NEW QUESTION 85
Given:

Which two are secure serialization of these objects? (Choose two.)

• A. Declare fields transient.
• B. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
• C. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
• D. Make the class abstract.
• E. Define the serialPersistentFields array field.

Answer: C,E

 

NEW QUESTION 86
Given:

Which is true?

• A. The code compiles but does not print any result.
• B. The code throws an exception at runtime.
• C. The code does not compile.
• D. The code prints 25.

Answer: C

 

NEW QUESTION 87
......

Understanding functional and technical aspects of Java SE 11 Developer Exam Number: 1Z0-819

The following will be discussed in the ORACLE 1Z0-006 dumps:

• Use local variable type inference, including as lambda parameters
• Use primitives and wrapper classes, including, operators, parentheses, type promotion and casting
• Handle text using String and StringBuilder classes

 

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