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Java Programming :: Language Fundamentals

  1. Which four options describe the correct default values for array elements of the types indicated?

    1. int -> 0
    2. String -> "null"
    3. Dog -> null
    4. char -> '\u0000'
    5. float -> 0.0f
    6. boolean -> true

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

  3. Which one of these lists contains only Java programming language keywords?

  4. A.
    class, if, void, long, Int, continue
    B.
    goto, instanceof, native, finally, default, throws
    C.
    try, virtual, throw, final, volatile, transient
    D.
    strictfp, constant, super, implements, do
    E.
    byte, break, assert, switch, include

  5. Which will legally declare, construct, and initialize an array?

  6. A.
    int [] myList = {"1", "2", "3"};
    B.
    int [] myList = (5, 8, 2);
    C.
    int myList [] [] = {4,9,7,0};
    D.
    int myList [] = {4, 3, 7};

  7. Which is a reserved word in the Java programming language?

  8. A.
    method
    B.
    native
    C.
    subclasses
    D.
    reference
    E.
    array

  9. Which is a valid keyword in java?

  10. A.
    interface
    B.
    string
    C.
    Float
    D.
    unsigned

  11. Which three are legal array declarations?

    1. int [] myScores [];
    2. char [] myChars;
    3. int [6] myScores;
    4. Dog myDogs [];
    5. Dog myDogs [7];

  12. A.
    1, 2, 4
    B.
    2, 4, 5
    C.
    2, 3, 4
    D.
    All are correct.

  13. public interface Foo  {      int k = 4; /* Line 3 */ } 
    Which three piece of codes are equivalent to line 3?
    1. final int k = 4;
    2. public int k = 4;
    3. static int k = 4;
    4. abstract int k = 4;
    5. volatile int k = 4;
    6. protected int k = 4;

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

  15. Which one of the following will declare an array and initialize it with five numbers?

  16. A.
    Array a = new Array(5);
    B.
    int [] a = {23,22,21,20,19};
    C.
    int a [] = new int[5];
    D.
    int [5] array;

  17. Which three are valid declarations of a char?

    1. char c1 = 064770;
    2. char c2 = 'face';
    3. char c3 = 0xbeef;
    4. char c4 = \u0022;
    5. char c5 = '\iface';
    6. char c6 = '\uface';

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

  19. Which is the valid declarations within an interface definition?

  20. A.
    public double methoda();
    B.
    public final double methoda();
    C.
    static void methoda(double d1);
    D.
    protected void methoda(double d1);