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Test of the Java Skill(2)

 2008-01-05 20:29:26 来源:WEB开发网   
核心提示: Question 9: What code placed after the comment: // Start For loop would populate the elements of the array ia[] with values of the variables i ? public cla


   Question 9:
   What code placed after the comment:
   // Start For loop
   would populate the elements of the array ia[] with values of the variables i ?

   public class Lin{
   public static void main(String argv[]){
   Lin l = new Lin();
   l.amethod();
   }

   public void amethod(){
   int ia[] = new int[4];
   // Start For loop
   {
   ia[i] = i;
   System.out.PRintln(ia[i]);
   }
   }
   }

   A. for(int i=0; i

   B. for (int i=0; i

   C. for(int i=0; i<4; i++)

   D. for(int i=0; i

   Question 10:
   Consider the following code:
   Integer s = new Integer(9);
   Integer t = new Integer(9);
   Long u = new Long(9);
   Which test would return true?
  A. (s==u)

   B. (s==t)

   C. (s.equals(t))

   D. (s.equals(9))

   E. (s.equals(new Integer(9))

   Question 11:
   Which of the following is sUCcessfully create an instance of the Vector class and add an element?

   A. Vector v = new Vector(99);
   v[1]=99;

   B. Vector v = new Vector();
   v.addElement(99);

   C. Vector v = new Vector();
   v.add(99);

   D. Vector v = new Vector(100);
   v.addElement(“99”);

   Question 12:
   What will happen when you attempt to compile and run the following code?

   class Base{
   private void amethod(int iBase){
   System.out.println(“Base.amethod”);
   }
   }

   class Over extends Base{
   public static void main(String argv[]){
   Over o = new Over();
   int iBase=0;
   o.amethod(iBase);
   }

   public void amethod(int iOver){
   System.out.println(“Over.amethod”);
   }
   }

   A. Compile time error complaining that Base.amethod is private

   B. Runtime error complaining that Base.amethod is private

   C. Output of Base.amethod

   D. Output of Over.amethod

   Question 13:
   What will happen if you try to compile and run the following code?

   public class MyClass
   public static void main(String arguments[]){
   amethod(arguments);
   }

   public void amethod(String[] arguments)
   System.out.println(arguments);
   System.out.println(arguments[1]);
   }
   }

   A. Error can't make static reference to void amethod

Tags:Test of the

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