1z0-809 practice test

1. Question 1 · 1

   Given 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 -

   Choose one answer.

   • line n1.
   • A compilation error occurs at line n2.
   • A compilation error occurs at line n3.
   • A compilation error occurs at

2. Question 2 · 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?

   Choose one answer.

   • 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.

3. Question 3 · 1

   Given the content of Operator.java, EngineOperator.java, and Engine.java files: and the code fragment: What is the result?

   Choose one answer.

   

   

   • The Engine.java file fails to compile.
   • The EngineOperator.java file fails to compile.
   • The Operator.java file fails to compile.
   • ON OFF

4. Question 4 · 1

   Given the code fragment: Which code fragment, when inserted at line n1, ensures false is printed?

   Choose one answer.

   

   • 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"));

5. Question 5 · 1

   Given the code fragment: What is the result?

   Choose one answer.

   

   • A compilation error occurs at line n1.
   • courseJava
   • Javacourse
   • A compilation error occurs at line n2.

6. Question 6 · 1

   Given: 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?

   Choose one answer.

   

   • assert (fuelLevel) : "Terminating"¦";
   • assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
   • assert fuelLevel < 0: System.exit(0);
   • assert fuelLevel > 0: "Impossible fuel" ;

7. Question 7 · 1

   Given the code fragment: What is the result?

   Choose one answer.

   

   • Val:20 Val:40 Val:60
   • Val:10 Val:20 Val:30
   • A compilation error occurs.
   • Val: Val: Val:

8. Question 8 · 1

   Given the code fragments: and What is the result?

   Choose one answer.

   

   

   • France Optional[NotFound]
   • Optional [France] Optional [NotFound]
   • Optional[France] Not Found
   • France Not Found

9. Question 9 · 1

   Given the code fragment: Which code fragment, when inserted at line n1, enables the code to print /First.txt?

   Choose one answer.

   

   • Path iP = new Paths ("/First.txt");
   • Path iP = Paths.toPath ("/First.txt");
   • Path iP = new Path ("/First.txt");
   • Path iP = Paths.get ("/", "First.txt");

10. Question 10 · 1

    and the code fragment? What is the result?

    Choose one answer.

    

    

    • $15.00
    • 15 $
    • USD 15.00
    • USD $15

11. Question 11 · 1

    Given the code fragment: What is the result?

    Choose one answer.

    

    • text1text2
    • text1text2text2text3
    • text1
    • [text1, text2]

12. Question 12 · 1

    Given: and Which interface from the java.util.function package should you use to refactor the class Txt?

    Choose one answer.

    

    

    • Consumer
    • Predicate
    • Supplier
    • Function

13. Question 13 · 1

    Given: and the command: java Product 0 What is the result?

    Choose one answer.

    

    • An AssertionError is thrown.
    • A compilation error occurs at line n1.
    • New Price: 0.0
    • A NumberFormatException is thrown at run time.

14. Question 14 · 1

    Given the code fragment: Assume that the value of now is 6:30 in the morning. What is the result?

    Choose one answer.

    

    • An exception is thrown at run time.
    • 0
    • 60
    • 1

15. Question 15 · 1

    Given the code fragments: and What is the result?

    Choose one answer.

    

    

    • The program prints Run"¦ and throws an exception.
    • A compilation error occurs at line n1.
    • Run"¦ Call"¦
    • A compilation error occurs at line n2.

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