Tag: technology

Quizzes (307) Questions (36705)

Questions Related to technology

Multiple choice technology programming languages

Click the Exhibit button. 1. public class Car { 2. private int wheelCount; 3. private String vin; 4. public Car(String vin) { 5. this.vin = vin; 6. this.wheelCount = 4; 7. } 8. public String drive() { 9. return “zoom-zoom”; 10. } 11. public String getInfo() { 12. return “VIN: “+ vin + “wheels: “+ wheelCount; 13. } 14. } And: 1. public class MeGo extends Car { 2. public MeGo(String vin) { 3. this.wheelCount = 3; 4. } 5. } What two must the programmer do to correct the compilation errors? (Choose two.)

  1. insert a call to this() in the Car constructor

  2. insert a call to this() in the MeGo constructor

  3. insert a call to super() in the MeGo constructor

  4. insert a call to super(vin) in the MeGo constructor

  5. change the wheelCount variable in Car to protected

  6. change line 3 in the MeGo class to super.wheelCount = 3;
Reveal answer Fill a bubble to check yourself
D,E Correct answer
Full explanation
Multiple choice technology programming languages

Given: 1. public class Blip { 2. protected int blipvert(int x) { return 0; } 3. } 4. class Vert extends Blip { 5. // insert code here 6. } Which five methods, inserted independently at line 5, will compile? (Choose five.)

  1. public int blipvert(int x) { return 0; }

  2. protected long blipvert(int x, int y) { return 0; }

  3. private int blipvert(long x) { return 0; }

  4. protected long blipvert(int x) { return 0; }

  5. protected int blipvert(long x) { return 0; }

  6. protected long blipvert(long x) { return 0; }
Reveal answer Fill a bubble to check yourself
A,B,C,E,F Correct answer
Full explanation
Multiple choice technology programming languages

Which four are true? (Choose four.)

  1. Has-a relationships should never be encapsulated.

  2. Has-a relationships should be implemented using inheritance.

  3. Has-a relationships can be implemented using instance variables.

  4. Is-a relationships can be implemented using the extends keyword.

  5. Is-a relationships can be implemented using the implements keyword.

  6. An array or a collection can be used to implement a one-to-many has-a relationship.
Reveal answer Fill a bubble to check yourself
C,D,E,F Correct answer
Full explanation
Multiple choice technology programming languages

Given: 11. public class Key { 12. private long id1; 13. private long 1d2; 14. 15. // class Key methods 16. } A programmer is developing a class Key, that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key? (Choose two.)

  1. public int hashCode()

  2. public boolean equals(Key k)

  3. public int compareTo(Object o)

  4. public boolean equals(Object o)

  5. public boolean compareTo(Key k)
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Full explanation