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 程式師世界 >> 編程語言 >> JAVA編程 >> JAVA編程入門知識 >> Test of the Java Skill(2)

Test of the Java Skill(2)

編輯:JAVA編程入門知識


      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
  
 

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