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<a href="../MockExams/Test70Qtns.htm"><font size="-2"><b>Java Test</b></font></a>
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<b> Java Test </b><br><br>
70 Questions<br>
<BR><BR>
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<TD></TD>
<TD width=475>
<P><FONT color=#b00000><B>Sun Certified Programmer Practice Exam<B></FONT><FONT color=#b00000></FONT>
<P>Source: ?</P>
<P>
<P><B><FONT face=Arial color=#000000>Questions</FONT></B></FONT>
<P><FONT color=#b00000></FONT><B><A name=no1>Question 1</A></B>: Which of
the following class definitions defines a legal <FONT
face=Courier>abstract</FONT> class?
<P>Select all right answers.
<P>a)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>class Animal {</FONT>
<DIR><FONT face=Courier>abstract void growl();</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>
<P>b)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>abstract Animal {</FONT>
<DIR><FONT face=Courier>abstract void growl();</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>
<P>c)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>class abstract Animal {</FONT>
<DIR><FONT face=Courier>abstract void growl();</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>
<P>d)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>abstract class Animal {</FONT>
<DIR><FONT face=Courier>abstract void growl();</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>
<P>e)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>abstract class Animal {</FONT>
<DIR><FONT face=Courier>abstract void growl() {</FONT>
<DIR><FONT
face=Courier>System.out.println("growl");</FONT></DIR><FONT
face=Courier>}</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>
<P>
<P><B>Question 2</B>: For an object to be a target for a Thread, that
object must be of type:
<P>Fill in the blank.
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center> </TD></TR></TBODY></TABLE>
<P>
<P><B>Question 3</B>: What is the proper way of defining a class named Key
so that it cannot be subclassed?
<P>a)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>class Key {
}</FONT></TD></TR></TBODY></TABLE>
<P>b)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>abstract final class Key {
}</FONT></TD></TR></TBODY></TABLE>
<P>c)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>native class Key {
}</FONT></TD></TR></TBODY></TABLE>
<P>d)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>class Key {</FONT>
<DIR><FONT face=Courier>final;</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>
<P>e)
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>final class Key {
}</FONT></TD></TR></TBODY></TABLE>
<P><B>Question 4</B>: What modes are legal for creating a new
RandomAccessFile object?
<P>Select all valid answers.
<OL type=a>
<LI>"w"
<LI>"r"
<LI>"x"
<LI>"rw"
<LI>"xrw" </LI></OL>
<P><B>Question 5</B>: Given the following code:
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>class Tester {</FONT>
<DIR><FONT face=Courier>public static void main(String[] args)
{</FONT>
<DIR><FONT face=Courier>CellPhone cell = new CellPhone();</FONT>
<P><FONT face=Courier>cell.emergency();</FONT></P></DIR><FONT
face=Courier>}</FONT></DIR><FONT face=Courier>}</FONT>
<P><FONT face=Courier></FONT>
<P><FONT face=Courier>class Phone {</FONT>
<DIR><FONT face=Courier>final void dial911() {</FONT>
<DIR><FONT face=Courier>// code to dial 911 here . .
..</FONT></DIR><FONT face=Courier>}</FONT></DIR><FONT
face=Courier>}</FONT>
<P><FONT face=Courier></FONT>
<P><FONT face=Courier>class CellPhone extends Phone {</FONT>
<DIR><FONT face=Courier>void emegency() {</FONT>
<DIR><FONT face=Courier>dial911();</FONT></DIR><FONT
face=Courier>}</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>What will happen when you
try to compile and run the Tester class?
<OL type=a>
<LI>The code will not compile because Phone is not also declared as
<FONT face=Courier>final</FONT>.
<LI>The code will not compile because you cannot invoke a <FONT
face=Courier>final</FONT> method from a subclass.
<LI>The code will compile and run fine.
<LI>The code will compile but will throw a NoSuchMethodException when
Tester is run.
<LI>Phone and CellPhone are fine, but Tester will not compile because it
cannot create an instance of a class that derives from a class defining
a <FONT face=Courier>final </FONT>method. </LI></OL>
<P><B>Question 6</B>: Which assignments are legal?
<P>Select all valid answers.
<OL type=a>
<LI><FONT face=Courier>long test = 012;
<LI>float f = -412;
<LI>int other = (int)true;
<LI>double d = 0x12345678;
<LI>short s = 10;</FONT> </LI></OL>
<P><B>Question 7</B>: Given this class definitions:
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center><FONT face=Courier>abstract class Transaction
implements Runnable { }</FONT>
<P><FONT face=Courier></FONT>
<P><FONT face=Courier>class Deposit extends Transaction {</FONT>
<DIR><FONT face=Courier>protected void process() {</FONT>
<DIR><FONT face=Courier>addAmount();</FONT></DIR><FONT
face=Courier>}</FONT>
<P><FONT face=Courier>void undo(int i) {</FONT>
<DIR><FONT
face=Courier>System.out.println("Undo");</FONT></DIR><FONT
face=Courier>}</FONT></DIR><FONT
face=Courier>}</FONT></TD></TR></TBODY></TABLE>What will happen if we
attempted to compile the code?
<P>Select the one right answer.
<OL type=a>
<LI>This code will not compile because the parameter <FONT
face=Courier>i</FONT> is not used in <FONT face=Courier>undo()</FONT>.
<LI>This code will not compile because there is no <FONT
face=Courier>main()</FONT> method.
<LI>This code will not compile because Deposit must be an <FONT
face=Courier>abstract</FONT> class.
<LI>This code will not compile because Deposit is not declared <FONT
face=Courier>public</FONT>.
<LI>Everything will compile fine. </LI></OL>
<P><B>Question 8</B>: Which exception might <FONT
face=Courier>wait()</FONT> throw?
<P>Fill in the blank.
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=center> </TD></TR></TBODY></TABLE>
<P><B>Question 9</B>: Which of the following are not Java keywords:
<TABLE cellSpacing=0 cellPadding=7 width="100%" border=1>
<TBODY>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>abstract</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>double</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>int</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>static</FONT></TD></TR>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>boolean</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>else</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>interface</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>super</FONT></TD></TR>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>break</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>extends</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>long</FONT></TD>
<TD vAlign=top width="13%"><FONT
face=Courier>superclass</FONT></TD></TR>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>byte</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>final</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>native</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>switch</FONT></TD></TR>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>case</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>finally</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>new</FONT></TD>
<TD vAlign=top width="13%"><FONT
face=Courier>synchronized</FONT></TD></TR>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>catch</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>float</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>null</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>this</FONT></TD></TR>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>char</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>for</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>open</FONT></TD>
<TD vAlign=top width="13%"><FONT face=Courier>throw</FONT></TD></TR>
<TR>
<TD vAlign=top width="13%"><FONT face=Courier>class</FONT></TD>
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