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  • Question
  • Which will legally declare, construct, and initialize an array?


  • Options
  • 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};

  • Correct Answer
  • int myList [] = {4, 3, 7}; 

    Explanation
    The only legal array declaration and assignment statement is Option D

    Option A is wrong because it initializes an int array with String literals.

    Option B is wrong because it use something other than curly braces for the initialization.

    Option C is wrong because it provides initial values for only one dimension, although the declared array is a two-dimensional array.


    Language Fundamentals problems


    Search Results


    • 1. Which three are legal array declarations?

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

    • Options
    • A. 1, 2, 4
    • B. 2, 4, 5
    • C. 2, 3, 4
    • D. All are correct.
    • Discuss
    • 2. Which one of these lists contains only Java programming language keywords?

    • Options
    • 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
    • Discuss
    • 3. 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

    • Options
    • A. 1, 2, 3, 4
    • B. 1, 3, 4, 5
    • C. 2, 4, 5, 6
    • D. 3, 4, 5, 6
    • Discuss
    • 4. 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';

    • Options
    • A. 1, 2, 4
    • B. 1, 3, 6
    • C. 3, 5
    • D. 5 only
    • Discuss
    • 5. Which is a reserved word in the Java programming language?

    • Options
    • A. method
    • B. native
    • C. subclasses
    • D. reference
    • E. array
    • Discuss
    • 6. What will be the output of the program?
      class SC2 
      {
          public static void main(String [] args) 
          {
              SC2 s = new SC2();
              s.start();
          }
      
          void start() 
          {
              int a = 3;
              int b = 4;
              System.out.print(" " + 7 + 2 + " ");
              System.out.print(a + b);
              System.out.print(" " + a + b + " ");
              System.out.print(foo() + a + b + " ");
              System.out.println(a + b + foo());
          }
      
          String foo() 
          {
              return "foo";
          }
      }
      

    • Options
    • A. 9 7 7 foo 7 7foo
    • B. 72 34 34 foo34 34foo
    • C. 9 7 7 foo34 34foo
    • D. 72 7 34 foo34 7foo
    • Discuss
    • 7. What will be the output of the program?
      class Bitwise 
      {
          public static void main(String [] args) 
          {
              int x = 11 & 9;
              int y = x ^ 3;
              System.out.println( y | 12 );
          }
      }
      

    • Options
    • A. 0
    • B. 7
    • C. 8
    • D. 14
    • Discuss
    • 8. What will be the output of the program?
      class Two 
      {
          byte x;
      }
      
      class PassO 
      {
          public static void main(String [] args) 
          {
              PassO p = new PassO();
              p.start();
          }
      
          void start() 
          {
              Two t = new Two();
              System.out.print(t.x + " ");
              Two t2 = fix(t);
              System.out.println(t.x + " " + t2.x);
          }
      
          Two fix(Two tt) 
          {
              tt.x = 42;
              return tt;
          }
      }
      

    • Options
    • A. null null 42
    • B. 0 0 42
    • C. 0 42 42
    • D. 0 0 0
    • Discuss
    • 9. What will be the output of the program?
      class Equals 
      {
          public static void main(String [] args) 
          {
              int x = 100;
              double y = 100.1;
              boolean b = (x = y); /* Line 7 */
              System.out.println(b);
          }
      }
      

    • Options
    • A. true
    • B. false
    • C. Compilation fails
    • D. An exception is thrown at runtime
    • Discuss
    • 10. What will be the output of the program?
      class Test 
      {
          public static void main(String [] args) 
          {
              int x=20;
              String sup = (x < 15)? "small" : (x < 22)? "tiny" : "huge";
              System.out.println(sup);
          }
      }
      

    • Options
    • A. small
    • B. tiny
    • C. huge
    • D. Compilation fails
    • Discuss


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