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Java Programming :: Declarations and Access Control

  1. You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access that accomplishes this objective?

  2. A.
    public
    B.
    private
    C.
    protected
    D.
    transient

  3. public class Outer  {      public void someOuterMethod()      {         //Line 5      }      public class Inner { }           public static void main(String[] argv)      {         Outer ot = new Outer();          //Line 10     }  }  

    Which of the following code fragments inserted, will allow to compile?

  4. A.
    new Inner(); //At line 5
    B.
    new Inner(); //At line 10
    C.
    new ot.Inner(); //At line 10
    D.
    new Outer.Inner(); //At line 10

  5. interface Base  {     boolean m1 ();     byte m2(short s); } 
    which two code fragments will compile?
    1. interface Base2 implements Base {}
    2. abstract class Class2 extends Base
      { public boolean m1(){ return true; }}
    3. abstract class Class2 implements Base {}
    4. abstract class Class2 implements Base
      { public boolean m1(){ return (7 > 4); }}
    5. abstract class Class2 implements Base
      { protected boolean m1(){ return (5 > 7) }}

  6. A.
    1 and 2
    B.
    2 and 3
    C.
    3 and 4
    D.
    1 and 5

  7. Which three form part of correct array declarations?

    1. public int a [ ]
    2. static int [ ] a
    3. public [ ] int a
    4. private int a [3]
    5. private int [3] a [ ]
    6. public final int [ ] a

  8. A.
    1, 3, 4
    B.
    2, 4, 5
    C.
    1, 2, 6
    D.
    2, 5, 6

  9. public class Test { } 
    What is the prototype of the default constructor?

  10. A.
    Test( )
    B.
    Test(void)
    C.
    public Test( )
    D.
    public Test(void)

  11. What is the most restrictive access modifier that will allow members of one class to have access to members of another class in the same package?

  12. A.
    public
    B.
    abstract
    C.
    protected
    D.
    synchronized
    E.
    default access

  13. Which of the following is/are legal method declarations?

    1. protected abstract void m1();
    2. static final void m1(){}
    3. synchronized public final void m1() {}
    4. private native void m1();

  14. A.
    1 and 3
    B.
    2 and 4
    C.
    1 only
    D.
    All of them are legal declarations.

  15. Which cause a compiler error?

  16. A.
    int[ ] scores = {3, 5, 7};
    B.
    int [ ][ ] scores = {2,7,6}, {9,3,45};
    C.
    String cats[ ] = {"Fluffy", "Spot", "Zeus"};
    D.
    boolean results[ ] = new boolean [] {true, false, true};
    E.
    Integer results[ ] = {new Integer(3), new Integer(5), new Integer(8)};

  17. Which three are valid method signatures in an interface?

    1. private int getArea();
    2. public float getVol(float x);
    3. public void main(String [] args);
    4. public static void main(String [] args);
    5. boolean setFlag(Boolean [] test);

  18. A.
    1 and 2
    B.
    2, 3 and 5
    C.
    3, 4, and 5
    D.
    2 and 4

  19. You want a class to have access to members of another class in the same package. Which is the most restrictive access that accomplishes this objective?

  20. A.
    public
    B.
    private
    C.
    protected
    D.
    default access