1Z0-819 Online Practice Questions and Answers

Given:

Why does D cause a compilation error?

A. D inherits a() only from C.

B. D inherits a() from B and C but the return types are incompatible.

C. D extends more than one interface.

D. D does not define any method.

Given: Automobile.java

Car.java

What must you do so that the code prints 4?

A. Remove the parameter from wheels method in line 3.

B. Add @Override annotation in line 2.

C. Replace the code in line 2 with Car ob = new Car();

D. Remove abstract keyword in line 1.

Given:

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

A. Option A

B. Option B

C. Option C

D. Option D

E. Option E

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. [Market Road, 1000]

B. [Peter, 30, Market Road]

C. [Peter, 25, null, 1000]

D. An exception is thrown at run time.

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 ();

Given:

and

What is the result?

A. ADBC

B. ACB

C. ACBD

D. ACD

E. ACDB

Given the code fragment:

Which two code fragments, independently, replace line 1 to implement the equivalent reduce operation? (Choose two.)

A. Integer sum = data.map(a -> a).reduce((a, b) -> a+b);

B. OptionalInt value = data.mapToInt(a -> a).parallel().reduce(0, (a, b) -> a+b); Integer sum = value.getAsInt();

C. int s = 0; Integer sum = data.map(a -> a).reduce(0, (a-> a + s));

D. OptionalInt value = data.mapToInt(a -> a).parallel().reduce((a, b) -> a+b); Integer sum = value.getAsInt();

E. Integer sum = data.mapToInt(a -> a).reduce(0, (a,b)->a+b));

Given:

What is the result?

A. X is 2

B. The compilation fails due to an error in line 1

C. The compilation fails due to an error in line 2

D. Error parsing value 0

E. X is 10

Given:

Which three statements cause a compiler error when inserted at line l? (Choose three.)

A. int i = theInstance.three++;

B. int b = two;

C. int c = three;

D. int a = one++;

E. int f = ExampleInterface.three;

F. int h = theInstance.two;

G. int e = ExampleInterface.two++;

H. int a = ExampleInterface.one;

I. int g = theInstance.one;

Given:

Which two code fragments remove the elements from the original list? (Choose two.)

A. Option A

B. Option B

C. Option C

D. Option D