Test of the Java Skill（2）

　　 

　　 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 suclearcase/" target="_blank" >ccessfully 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

　　 B. Error method main not correct

　　 C. Error array must include parameter

　　 D. Error amethod must be declared with String

　　 Question 14:
　　 If you wanted to find out where the position of the letter v (i.e. return 2) in the string s containing “Java”, which of the following could you use?

　　 A. mid(2,s);

　　 B. charAt(2);

　　 C. s.indexOf(‘v');

　　 D. indexOf(s,'v');

　　 Question 15:
　　 What will happen when you attempt to compile and run the following code?

　　 public class Bground extends Thread{

　　 public static void main(String argv[]){
　　 Bground b = new Bground();
　　 b.run();
　　 }
　　 public void start(){
　　 for (int i=0;i<10;i++){
　　 System.out.println(“Value of i=” + i);
　　 }
　　 }
　　 }
　　 A. A compile time error indicating that no run method is defined for the Thread class

　　 B. A run time error indicating that no run method is defined for the Thread class

　　 C. Clean compile and at run time the values 0 to 9 are printed out

　　 D. Clean compile but no output at runtime

　　 Question 16:
　　 What will happen when you compile the following code?

　　 public class MyClass{
　　 static int i;

　　 public static void main(String argv[]){
　　 System.out.println(i);
　　 }
　　 }

　　 A. Error Variable i may out have been initialized

　　 B. null

　　 C. 1

　　 D. 0（CN-JAVA）

原文转自：http://www.ltesting.net