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  • Question
  • What will be the output of the program?
    public class CommandArgsTwo 
    {
        public static void main(String [] argh) 
        {
            int x;
            x = argh.length;
            for (int y = 1; y <= x; y++) 
            {
                System.out.print(" " + argh[y]);
            }
        }
    }
    
    and the command-line invocation is

    > java CommandArgsTwo 1 2 3


  • Options
  • A. 0 1 2
  • B. 1 2 3
  • C. 0 0 0
  • D. An exception is thrown at runtime

  • Correct Answer
  • An exception is thrown at runtime 

    Explanation
    An exception is thrown because at some point in (System.out.print(" " + argh[y]);), the value of x will be equal to y, resulting in an attempt to access an index out of bounds for the array. Remember that you can access only as far as length - 1, so loop logical tests should use x < someArray.length as opposed to x < = someArray.length.

    More questions

    • 1. What will be the output of the program?
      public class SqrtExample 
      {
          public static void main(String [] args) 
          {
              double value = -9.0;
              System.out.println( Math.sqrt(value));
          }
      }
      

    • Options
    • A. 3.0
    • B. -3.0
    • C. NaN
    • D. Compilation fails.
    • Discuss
    • 2. Which two are valid constructors for Thread?

      1. Thread(Runnable r, String name)
      2. Thread()
      3. Thread(int priority)
      4. Thread(Runnable r, ThreadGroup g)
      5. Thread(Runnable r, int priority)

    • Options
    • A. 1 and 3
    • B. 2 and 4
    • C. 1 and 2
    • D. 2 and 5
    • Discuss
    • 3. Which collection class allows you to associate its elements with key values, and allows you to retrieve objects in FIFO (first-in, first-out) sequence?

    • Options
    • A. java.util.ArrayList
    • B. java.util.LinkedHashMap
    • C. java.util.HashMap
    • D. java.util.TreeMap
    • Discuss
    • 4. What will be the output of the program?
      String x = "xyz";
      x.toUpperCase(); /* Line 2 */
      String y = x.replace('Y', 'y');
      y = y + "abc";
      System.out.println(y);
      

    • Options
    • A. abcXyZ
    • B. abcxyz
    • C. xyzabc
    • D. XyZabc
    • Discuss
    • 5. What will be the output of the program?
      public class SwitchTest 
      {  
          public static void main(String[] args) 
          {
              System.out.println("value =" + switchIt(4)); 
          } 
          public static int switchIt(int x) 
          {
              int j = 1;  
              switch (x) 
              { 
                  case l: j++; 
                  case 2: j++;  
                  case 3: j++; 
                  case 4: j++; 
                  case 5: j++; 
                  default: j++; 
                  } 
              return j + x;  
          } 
      }
      

    • Options
    • A. value = 2
    • B. value = 4
    • C. value = 6
    • D. value = 8
    • Discuss
    • 6. What will be the output of the program?
      public class If2 
      {
          static boolean b1, b2;
          public static void main(String [] args) 
          {
              int x = 0;
              if ( !b1 ) /* Line 7 */
              {
                  if ( !b2 ) /* Line 9 */
                  {
                      b1 = true;
                      x++;
                      if ( 5 > 6 ) 
                      {
                          x++;
                      }
                      if ( !b1 ) 
                          x = x + 10;
                      else if ( b2 = true ) /* Line 19 */
                          x = x + 100;
                      else if ( b1 | b2 ) /* Line 21 */
                          x = x + 1000;
                  }
              }
              System.out.println(x);
          }
      }
      

    • Options
    • A. 0
    • B. 1
    • C. 101
    • D. 111
    • Discuss
    • 7. What will be the output of the program?
      public class A
      { 
          void A() /* Line 3 */
          {
              System.out.println("Class A"); 
          } 
          public static void main(String[] args) 
          { 
              new A(); 
          } 
      }
      

    • Options
    • A. Class A
    • B. Compilation fails.
    • C. An exception is thrown at line 3.
    • D. The code executes with no output.
    • Discuss
    • 8. What will be the output of the program?
      class Test 
      {
          public static void main(String [] args) 
          {
              Test p = new Test();
              p.start();
          }
      
          void start() 
          {
              boolean b1 = false;
              boolean b2 = fix(b1);
              System.out.println(b1 + " " + b2);
          }
      
          boolean fix(boolean b1) 
          {
              b1 = true;
              return b1;
          }
      }
      

    • Options
    • A. true true
    • B. false true
    • C. true false
    • D. false false
    • Discuss
    • 9. What will be the output of the program?
      class Test 
      {
          static int s;
          public static void main(String [] args) 
          {
              Test p = new Test();
              p.start();
              System.out.println(s);
          }
      
          void start() 
          {
              int x = 7;
              twice(x);
              System.out.print(x + " ");
          }
      
          void twice(int x) 
          {
              x = x*2;
              s = x;
          }
      }
      

    • Options
    • A. 7 7
    • B. 7 14
    • C. 14 0
    • D. 14 14
    • Discuss
    • 10. You want a class to have access to members of another class in the same package. Which is the most restrictive access that accomplishes this objective?

    • Options
    • A. public
    • B. private
    • C. protected
    • D. default access
    • Discuss


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