Test of the Java Skill(2)

王朝java/jsp·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

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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