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  • Question
  • What will be the output of the program?
    int i = 1, j = 10; 
    do 
    {
        if(i++ > --j) /* Line 4 */
        {
            continue; 
        } 
    } while (i < 5); 
    System.out.println("i = " + i + "and j = " + j); /* Line 9 */
    


  • Options
  • A. i = 6 and j = 5
  • B. i = 5 and j = 5
  • C. i = 6 and j = 6
  • D. i = 5 and j = 6

  • Correct Answer
  • i = 5 and j = 6 

    Explanation
    This question is not testing your knowledge of the continue statement. It is testing your knowledge of the order of evaluation of operands. Basically the prefix and postfix unary operators have a higher order of evaluation than the relational operators. So on line 4 the variable i is incremented and the variable j is decremented before the greater than comparison is made. As the loop executes the comparison on line 4 will be:

    if(i > j)

    if(2 > 9)

    if(3 > 8)

    if(4 > 7)

    if(5 > 6) at this point i is not less than 5, therefore the loop terminates and line 9 outputs the values of i and j as 5 and 6 respectively.

    The continue statement never gets to execute because i never reaches a value that is greater than j.


    More questions

    • 1. 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
    • 2. What will be the output of the program?
      class A 
      {
          final public int GetResult(int a, int b) { return 0; } 
      } 
      class B extends A 
      { 
          public int GetResult(int a, int b) {return 1; } 
      } 
      public class Test 
      {
          public static void main(String args[]) 
          { 
              B b = new B(); 
              System.out.println("x = " + b.GetResult(0, 1));  
          } 
      }
      

    • Options
    • A. x = 0
    • B. x = 1
    • C. Compilation fails.
    • D. An exception is thrown at runtime.
    • Discuss
    • 3. What will be the output of the program?
      public class Switch2 
      {
          final static short x = 2;
          public static int y = 0;
          public static void main(String [] args) 
          {
              for (int z=0; z < 4; z++) 
              {
                  switch (z) 
                  {
                      case x: System.out.print("0 ");
                      default: System.out.print("def ");
                      case x-1: System.out.print("1 ");  
                                  break;
                      case x-2: System.out.print("2 ");
                  }
              }
          }
      }
      

    • Options
    • A. 0 def 1
    • B. 2 1 0 def 1
    • C. 2 1 0 def def
    • D. 2 1 0 def 1 def 1
    • Discuss
    • 4. What will be the output of the program?
      import java.util.*; 
      class H 
      {
          public static void main (String[] args) 
          { 
              Object x = new Vector().elements(); 
              System.out.print((x instanceof Enumeration)+","); 
              System.out.print((x instanceof Iterator)+","); 
              System.out.print(x instanceof ListIterator); 
          } 
      }
      

    • Options
    • A. Prints: false,false,false
    • B. Prints: false,false,true
    • C. Prints: false,true,false
    • D. Prints: true,false,false
    • Discuss
    • 5. Which statement is true?

    • Options
    • A. A try statement must have at least one corresponding catch block.
    • B. Multiple catch statements can catch the same class of exception more than once.
    • C. An Error that might be thrown in a method must be declared as thrown by that method, or be handled within that method.
    • D. Except in case of VM shutdown, if a try block starts to execute, a corresponding finally block will always start to execute.
    • Discuss
    • 6. Which statement is true about assertions in the Java programming language?

    • Options
    • A. Assertion expressions should not contain side effects.
    • B. Assertion expression values can be any primitive type.
    • C. Assertions should be used for enforcing preconditions on public methods.
    • D. An AssertionError thrown as a result of a failed assertion should always be handled by the enclosing method.
    • Discuss
    • 7. What will be the output of the program?
      String s = "ABC"; 
      s.toLowerCase(); 
      s += "def"; 
      System.out.println(s);
      

    • Options
    • A. ABC
    • B. abc
    • C. ABCdef
    • D. Compile Error
    • Discuss
    • 8. What will be the output of the program?
      class Super 
      { 
          public Integer getLength() 
          {
              return new Integer(4); 
          } 
      } 
      
      public class Sub extends Super 
      { 
          public Long getLength() 
          {
              return new Long(5); 
          } 
      
          public static void main(String[] args) 
          { 
              Super sooper = new Super(); 
              Sub sub = new Sub(); 
              System.out.println( 
              sooper.getLength().toString() + "," + sub.getLength().toString() ); 
          } 
      }
      

    • Options
    • A. 4, 4
    • B. 4, 5
    • C. 5, 4
    • D. Compilation fails.
    • Discuss
    • 9. Which statement is true for the class java.util.HashSet?

    • Options
    • A. The elements in the collection are ordered.
    • B. The collection is guaranteed to be immutable.
    • C. The elements in the collection are guaranteed to be unique.
    • D. The elements in the collection are accessed using a unique key.
    • Discuss
    • 10. What will be the output of the program?
      public class Test 
      { 
          private static int[] x; 
          public static void main(String[] args) 
          { 
              System.out.println(x[0]); 
          } 
      }
      

    • Options
    • A. 0 
    • B. null
    • C. Compile Error
    • D. NullPointerException at runtime
    • Discuss


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