Download Oracle.1z0-809.PassCertification.2020-01-30.117q.tqb
| Vendor: | Oracle |
| Exam Code: | 1z0-809 |
| Exam Name: | Java SE 8 Programmer II |
| Date: | Jan 30, 2020 |
| File Size: | 5 MB |
Demo Questions
Question 1
Given the definition of the Vehicle class:
Class Vehicle {
int distance;
Vehicle (int x) {
this distance = x;
}
public void increSpeed(int time) {
int timeTravel = time; //line n1
//line n3
class Car {
int value = 0;
public void speed () {
value = distance /timeTravel; //line n2
System.out.println (“Velocity with new speed”+value+”kmph”);
}
}
speed(); //line n3
}
}
and this code fragment:
Vehicle v = new Vehicle (100);
v.increSpeed(60);
What is the result?
- Velocity with new speed 1 kmph
- A compilation error occurs at line n1.
- A compilation error occurs at line n2.
- A compilation error occurs at line n3.
Correct answer: A
Question 2
Given the code fragment:
List<Integer> values = Arrays.asList (1, 2, 3);
values.stream ()
.map(n -> n*2) //line n1
.peek(System.out::print) //line n2
.count();
What is the result?
- 246
- The code produces no output.
- A compilation error occurs at line n1.
- A compilation error occurs at line n2.
Correct answer: A
Question 3
Given:
class Sum extends RecursiveAction { //line n1
static final int THRESHOLD_SIZE = 3;
int stIndex, lstIndex;
int [ ] data;
public Sum (int [ ]data, int start, int end) {
this.data = data;
this stIndex = start;
this. lstIndex = end;
}
protected void compute ( ) {
int sum = 0;
if (lstIndex – stIndex <= THRESHOLD_SIZE) {
for (int i = stIndex; i < lstIndex; i++) {
sum += data [i];
}
System.out.println(sum);
} else {
new Sum (data, stIndex + THRESHOLD_SIZE, lstIndex).fork( );
new Sum (data, stIndex,
Math.min (lstIndex, stIndex + THRESHOLD_SIZE)
).compute ();
}
}
}
and the code fragment:
ForkJoinPool fjPool = new ForkJoinPool ( );
int data [ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
fjPool.invoke (new Sum (data, 0, data.length));
and given that the sum of all integers from 1 to 10 is 55.
Which statement is true?
- The program prints several values that total 55.
- The program prints 55.
- A compilation error occurs at line n1.
- The program prints several values whose sum exceeds 55.
Correct answer: C
