Declarations and Access Control

Q1:
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) }}

A 1 and 2

B 2 and 3

C 3 and 4

D 1 and 5

Q2: Given a method in a protected class, what access modifier do you use to restrict access to that method to only the other members of the same class?

A final

B static

C private

D protected

E volatile

Q3: Which one creates an instance of an array?

A int[ ] ia = new int[15];

B float fa = new float[20];

C char[ ] ca = "Some String";

D int ia[ ] [ ] = { 4, 5, 6 }, { 1,2,3 };

Q4:
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

A 1, 3, 4

B 2, 4, 5

C 1, 2, 6

D 2, 5, 6

Q5: Which of the following class level (nonlocal) variable declarations will not compile?

A protected int a;

B transient int b = 3;

C private synchronized int e;

D volatile int d;

Q6: Which is a valid declaration within an interface?

A public static short stop = 23;

B protected short stop = 23;

C transient short stop = 23;

D final void madness(short stop);

Q7: 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?

A public

B private

C protected

D default access

Q8:
class A 
{  
    protected int method1(int a, int b) 
    {
        return 0; 
    } 
}
Which is valid in a class that extends class A?

A public int method1(int a, int b) {return 0; }

B private int method1(int a, int b) { return 0; }

C public short method1(int a, int b) { return 0; }

D static protected int method1(int a, int b) { return 0; }

Q9: Given a method in a protected class, what access modifier do you use to restrict access to that method to only the other members of the same class?

A final

B static

C private

D protected

E volatile

Q10:
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();

A 1 and 3

B 2 and 4

C 1 only

D All of them are legal declarations.

Q11:
Which two cause a compiler error?
  1. float[ ] f = new float(3);
  2. float f2[ ] = new float[ ];
  3. float[ ]f1 = new float[3];
  4. float f3[ ] = new float[3];
  5. float f5[ ] = {1.0f, 2.0f, 2.0f};

A 2, 4

B 3, 5

C 4, 5

D 1, 2

Q12:
public class Test { }
What is the prototype of the default constructor?

A Test( )

B Test(void)

C public Test( )

D public Test(void)

Q13:
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();

A 1 and 3

B 2 and 4

C 1 only

D All of them are legal declarations.

Q14:
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);

A 1 and 2

B 2, 3 and 5

C 3, 4, and 5

D 2 and 4

Q15:
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?

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

Q16: What is the widest valid returnType for methodA in line 3?
public class ReturnIt 
{ 
    returnType methodA(byte x, double y) /* Line 3 */
    { 
        return (long)x / y * 2; 
    } 
}

A int

B byte

C long

D double

Q17: 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?

A public

B abstract

C protected

D synchronized

E default access

Q18:
Which two of the following are legal declarations for nonnested classes and interfaces?
  1. final abstract class Test {}
  2. public static interface Test {}
  3. final public class Test {}
  4. protected abstract class Test {}
  5. protected interface Test {}
  6. abstract public class Test {}

A 1 and 4

B 2 and 5

C 3 and 6

D 4 and 6

Q19: You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access that accomplishes this objective?

A public

B private

C protected

D transient

Q20: Which cause a compiler error?

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)};

Q21: Which of the following class level (nonlocal) variable declarations will not compile?

A protected int a;

B transient int b = 3;

C private synchronized int e;

D volatile int d;

Q22: Which of the following class level (nonlocal) variable declarations will not compile?

A protected int a;

B transient int b = 3;

C private synchronized int e;

D volatile int d;


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