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  • Question

  • 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


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

  • Correct Answer
  • 1, 2, 6 

    Explanation
    (1), (2) and (6) are valid array declarations.

    Option (3) is not a correct array declaration. The compiler complains with: illegal start of type. The brackets are in the wrong place. The following would work: public int[ ] a

    Option (4) is not a correct array declaration. The compiler complains with: ']' expected. A closing bracket is expected in place of the 3. The following works: private int a []

    Option (5) is not a correct array declaration. The compiler complains with 2 errors:

    ']' expected. A closing bracket is expected in place of the 3 and

    <identifier> expected A variable name is expected after a[ ] .

    More questions

    • 1. What will be the output of the program? 
      int i = (int) Math.random();

    • Options
    • A. i = 0
    • B. i = 1
    • C. value of i is undetermined
    • D. Statement causes a compile error
      • Discuss
    • 2. What will be the output of the program? 
      class Tree { } 
class Pine extends Tree { } 
class Oak extends Tree { } 
public class Forest1 
{ 
    public static void main (String [] args)
    { 
        Tree tree = new Pine(); 
        if( tree instanceof Pine ) 
            System.out.println ("Pine"); 
        else if( tree instanceof Tree ) 
            System.out.println ("Tree"); 
        else if( tree instanceof Oak ) 
            System.out.println ( "Oak" ); 
        else 
            System.out.println ("Oops "); 
    } 
}

    • Options
    • A. Pine
    • B. Tree
    • C. Forest
    • D. Oops
      • Discuss
    • 3. What will be the output of the program? 
      public class StringRef 
{
    public static void main(String [] args) 
    {
        String s1 = "abc";
        String s2 = "def";
        String s3 = s2;   /* Line 7 */
        s2 = "ghi";
        System.out.println(s1 + s2 + s3);
    }
}

    • Options
    • A. abcdefghi
    • B. abcdefdef
    • C. abcghidef
    • D. abcghighi
      • Discuss
    • 4. What will be the output of the program? 
      public class ObjComp 
{
    public static void main(String [] args ) 
    {
        int result = 0;
        ObjComp oc = new ObjComp();
        Object o = oc;

        if (o == oc)  
            result = 1;
        if (o != oc)  
            result = result + 10;
        if (o.equals(oc) )  
            result = result + 100;
        if (oc.equals(o) )  
            result = result + 1000;

        System.out.println("result = " + result);
    }
}

    • Options
    • A. 1
    • B. 10
    • C. 101
    • D. 1101
      • Discuss
    • 5. What will be the output of the program? 
      String d = "bookkeeper";
d.substring(1,7);
d = "w" + d;
d.append("woo");  /* Line 4 */
System.out.println(d);

    • Options
    • A. wookkeewoo
    • B. wbookkeeper
    • C. wbookkeewoo
    • D. Compilation fails.
      • Discuss
    • 6. What will be the output of the program? 
      interface Count 
{
    short counter = 0;
    void countUp();
}
public class TestCount implements Count 
{
    public static void main(String [] args) 
    {
        TestCount t = new TestCount();
        t.countUp();
    }
    public void countUp() 
    {
        for (int x = 6; x>counter; x--, ++counter) /* Line 14 */
        {
            System.out.print(" " + counter);
        }
    }
}

    • Options
    • A. 0 1 2
    • B. 1 2 3
    • C. 0 1 2 3
    • D. 1 2 3 4
    • E. Compilation fails
      • Discuss
    • 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

    • Options
    • A. 1, 3, 4
    • B. 2, 4, 5
    • C. 1, 2, 6
    • D. 2, 5, 6
      • Discuss
    • 8. What will be the output of the program? 
      public class X 
{ 
    public static void main(String [] args) 
    {
        try 
        {
            badMethod();  
            System.out.print("A"); 
        }  
        catch (Exception ex) 
        {
            System.out.print("B"); 
        }  
        finally 
        {
            System.out.print("C"); 
        }  
        System.out.print("D"); 
    }  
    public static void badMethod() {} 
}

    • Options
    • A. AC
    • B. BC
    • C. ACD
    • D. ABCD
      • Discuss
    • 9. Which of the following line of code is suitable to start a thread? 
      class X implements Runnable 
{ 
    public static void main(String args[]) 
    {
        /* Missing code? */
    } 
    public void run() {} 
}

    • Options
    • A. Thread t = new Thread(X);
    • B. Thread t = new Thread(X); t.start();
    • C. X run = new X(); Thread t = new Thread(run); t.start();
    • D. Thread t = new Thread(); x.run();
      • Discuss
    • 10. What will be the output of the program? 
      try 
{
    Float f1 = new Float("3.0");
    int x = f1.intValue();
    byte b = f1.byteValue();
    double d = f1.doubleValue();
    System.out.println(x + b + d);
}
catch (NumberFormatException e) /* Line 9 */
{
    System.out.println("bad number"); /* Line 11 */
}

    • Options
    • A. 9.0
    • B. bad number
    • C. Compilation fails on line 9.
    • D. Compilation fails on line 11.
      • Discuss

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