11. What is the narrowest valid returnType for methodA in line 3?

public class ReturnIt
{
    returnType methodA(byte x, double y) /* Line 3 */
    {
        return (long)x / y * 2;
    }
}

int
byte
long
double

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12. class A
{
    protected int method1(int a, int b)
    {
        return 0;
    }
}

Which is valid in a class that extends class A?

public int method1(int a, int b) {return 0; }
private int method1(int a, int b) { return 0; }
public short method1(int a, int b) { return 0; }
static protected int method1(int a, int b) { return 0; }

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13. Which one creates an instance of an array?

int[ ] ia = new int[15];
float fa = new float[20];
char[ ] ca = "Some String";
int ia[ ] [ ] = { 4, 5, 6 }, { 1,2,3 };

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14. Which two of the following are legal declarations for nonnested classes and interfaces?

    final abstract class Test {}
    public static interface Test {}
    final public class Test {}
    protected abstract class Test {}
    protected interface Test {}
    abstract public class Test {}

1 and 4
2 and 5
3 and 6
4 and 6

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15. Which of the following class level (nonlocal) variable declarations will not compile?

protected int a;
transient int b = 3;
private synchronized int e;
volatile int d;

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16. Which two cause a compiler error?

    float[ ] f = new float(3);
    float f2[ ] = new float[ ];
    float[ ]f1 = new float[3];
    float f3[ ] = new float[3];
    float f5[ ] = {1.0f, 2.0f, 2.0f};

2, 4
3, 5
4, 5
1, 2

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17. 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?

final
static
private
protected

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18. Which is a valid declaration within an interface?

public static short stop = 23;
protected short stop = 23;
transient short stop = 23;
final void madness(short stop);

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Java - Declarations and Access Control

Java - Declarations and Access Control

Java Programming