1z0-809 — Free Practice Questions
10 free sample questions from a bank of 213, with the correct answers and explanations. No signup required — start practising right now.
1Given:
IntStream stream = IntStream.of (1,2,3);
IntFunction inFu= x -> y -> x*y; //line n1
IntStream newStream = stream.map(inFu.apply(10)); //line n2 newStream.forEach(System.output::print);
Which modification enables the code fragment to compile?
line n1 with:
- Replace IntFunction inFu = x -> y -> x*y; line n1 with:
- Replace IntFunction inFu = x -> y -> x*y; line n1 with:
- Replace BiFunction inFu = x -> y -> x*y; line n2 with:
- Replace
Answer: D
2Given the definition of the Vehicle class:
Class Vehhicle {
int distance; //line n1
Vehicle (int x) {
this distance = x;
}
public void increSpeed(int time) { //line n2
int timeTravel = time; //line n3
class Car {
int value = 0;
public void speed () {
value = distance /timeTravel;
System.out.println ("Velocity with new speed"+value+"kmph");
}
}
new Car().speed();
}
}
and this code fragment:
Vehicle v = new Vehicle (100);
v.increSpeed(60);
What is the result?
Velocity with new speed -
- line n1.
- A compilation error occurs at line n2.
- A compilation error occurs at line n3.
- A compilation error occurs at
Answer: A
3Given 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.
Answer: D
4Given the code fragment:
Path source = Paths.get ("/data/december/log.txt");
Path destination = Paths.get("/data");
Files.copy (source, destination);
/data/december/log.txt is accessible and contains:
and assuming that the file
10-Dec-2014 Executed successfully
What is the result?
log.txt is created in the /data directory and the content of the /data/december/log.txt file is copied to it.
- A file with the name
- The program executes successfully and does NOT change the file system. FileNotFoundException is thrown at run time.
- A FileAlreadyExistsException is thrown at run time.
- A
Answer: B
5Given the content of Operator.java, EngineOperator.java, and Engine.java files: and the code fragment: What is the result?
- The Engine.java file fails to compile.
- The EngineOperator.java file fails to compile.
- The Operator.java file fails to compile.
- ON OFF
Answer: C
6Given the code fragment: Which code fragment, when inserted at line n1, ensures false is printed?
- boolean b = cs.stream() .findAny() .get() .equals("Java");
- boolean b = cs.stream() .anyMatch (w -> w.equals ("Java"));
- boolean b = cs.stream() .findFirst() .get() .equals("Java");
- boolean b = cs.stream() .allMatch(w -> w.equals("Java"));
Answer: D
7Given the code fragment: What is the result?
- A compilation error occurs at line n1.
- courseJava
- Javacourse
- A compilation error occurs at line n2.
Answer: D
8Given: Your design requires that:
✑ fuelLevel of Engine must be greater than zero when the start() method is invoked.
✑ The code must terminate if fuelLevel of Engine is less than or equal to zero.
Which code fragment should be added at line n1 to express this invariant condition?
- assert (fuelLevel) : "Terminating"¦";
- assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
- assert fuelLevel < 0: System.exit(0);
- assert fuelLevel > 0: "Impossible fuel" ;
Answer: D
9Given the code fragments: and What is the result?
- France Optional[NotFound]
- Optional [France] Optional [NotFound]
- Optional[France] Not Found
- France Not Found
Answer: D
10Given the code fragment: Which code fragment, when inserted at line n1, enables the code to print /First.txt?
- Path iP = new Paths ("/First.txt");
- Path iP = Paths.toPath ("/First.txt");
- Path iP = new Path ("/First.txt");
- Path iP = Paths.get ("/", "First.txt");
Answer: D
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