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📁 详细介绍scjp考试指南包括基础语法和文件读取
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      <OL type=a>
        <LI>Illegal at compile time 
        <LI>Legal at compile time but possibly illegal at runtime 
        <LI>Definitely legal at runtime </LI></OL>&nbsp; 
      <P><B>Question 21</B>: How you can use the escape notation \u to set the 
      variable <FONT face=Courier>c</FONT>, declared as a <FONT 
      face=Courier>char</FONT>, to the Unicode character whose value is hex 
      0x30A0? 
      <P>Fill in the blank. 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT 
      face=Courier>&nbsp;</FONT></TD></TR></TBODY></TABLE>
      <P>
      <P><B>Question 22</B>: Which operators are overloaded for String objects? 
      <P>
      <P><B><A name=no20>Question 20</A></B>: Given these class definitions: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>class Superclass { }</FONT> 
            <P><FONT face=Courier>class Subclass1 extends Superclass { }</FONT> 
            <P><FONT face=Courier>class Subclass2 extends Superclass { 
            }</FONT></P></TD></TR></TBODY></TABLE>and these objects: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>Superclass a = new 
            Superclass();</FONT> 
            <P><FONT face=Courier>Subclass1 b = new Subclass1();</FONT> 
            <P><FONT face=Courier>Subclass2 c = new 
        Subclass2();</FONT></P></TD></TR></TBODY></TABLE>which of the following 
      explains the result of the statement: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>b = 
        (Subclass1)c;</FONT></TD></TR></TBODY></TABLE>Select the one right answer. 

      <P>
      <OL type=a>
        <LI>Illegal at compile time 
        <LI>Legal at compile time but possibly illegal at runtime 
        <LI>Definitely legal at runtime </LI></OL>
      <P><B>Question 21</B>: How you can use the escape notation \u to set the 
      variable <FONT face=Courier>c</FONT>, declared as a <FONT 
      face=Courier>char</FONT>, to the Unicode character whose value is hex 
      0x30A0? 
      <P>Fill in the blank. 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT 
      face=Courier>&nbsp;</FONT></TD></TR></TBODY></TABLE><B>Question 22</B>: 
      Which operators are overloaded for String objects? 
      <P>Select all valid answers. 
      <P>
      <OL type=a>
        <LI><FONT face=Courier>-</FONT> 
        <LI><FONT face=Courier>+=</FONT> 
        <LI><FONT face=Courier>&gt;&gt;</FONT> 
        <LI><FONT face=Courier>&amp;</FONT> </LI></OL>
      <LI>none of these 
      <P><B>Question 23</B>: How can you change the <FONT 
      face=Courier>break</FONT> statement below so that it breaks out of both 
      the inner and middle loops and continues with the next iteration of the 
      outer loop? 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>outer: for (int x = 0; x &lt; 
            3; x++) {</FONT> 
            <DIR><FONT face=Courier>middle: for (int y = 0; y &lt; 3; y++) 
            {</FONT> 
            <DIR><FONT face=Courier>inner: for (int z = 0; z &lt; 3; z++) 
            {</FONT> 
            <DIR><FONT face=Courier>if (arr(x, y, z) == targetValue)</FONT> 
            <DIR><FONT face=Courier>break;</FONT></DIR></DIR><FONT 
            face=Courier>}</FONT></DIR><FONT face=Courier>}</FONT></DIR><FONT 
            face=Courier>}</FONT></TD></TR></TBODY></TABLE>Select the one right 
      answer. 
      <P>
      <OL type=a>
        <LI>break inner; 
        <LI>break middle; 
        <LI>break outer; 
        <LI>continue; 
        <LI>continue middle; </LI></OL>
      <P>
      <P><B>Question 24</B>: Given this code snippet: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>try {</FONT> 
            <DIR><FONT face=Courier>tryThis();</FONT> 
            <P><FONT face=Courier>return;</FONT></P></DIR><FONT face=Courier>} 
            catch (IOException x1) {</FONT> 
            <DIR><FONT face=Courier>System.out.println("exception 1");</FONT> 
            <P><FONT face=Courier>return;</FONT></P></DIR><FONT face=Courier>} 
            catch (Exception x2) {</FONT> 
            <DIR><FONT face=Courier>System.out.println("exception 2");</FONT> 
            <P><FONT face=Courier>return;</FONT></P></DIR><FONT face=Courier>} 
            finally {</FONT> 
            <DIR><FONT 
            face=Courier>System.out.println("finally");</FONT></DIR><FONT 
            face=Courier>}</FONT></TD></TR></TBODY></TABLE>What will appear in the 
      standard output if <FONT face=Courier>tryThis()</FONT> throws a 
      NumberFormatException? 
      <P>Select the one right answer. 
      <P>
      <OL type=a>
        <LI>Nothing 
        <LI>"exception 1", followed by "finally" 
        <LI>"exception 2", followed by "finally" 
        <LI>"exception 1" 
        <LI>"exception 2" </LI></OL>
      <P>
      <P><B>Question 25</B>: Given these class definitions: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>class Superclass { }</FONT> 
            <P><FONT face=Courier>class Subclass1 extends Superclass { 
            }</FONT></P></TD></TR></TBODY></TABLE>and these objects: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>Superclass a = new 
            Superclass();</FONT> 
            <P><FONT face=Courier>Subclass1 b = new 
        Subclass1();</FONT></P></TD></TR></TBODY></TABLE>which of the following 
      explains the result of the statement: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>b = 
      a;</FONT></TD></TR></TBODY></TABLE>Select the one right answer. 
      <P>
      <OL type=a>
        <LI>Illegal at compile time 
        <LI>Legal at compile time but possibly illegal at runtime 
        <LI>Definitely legal at runtime </LI></OL>
      <P><B>Question 26</B>: Given these class definitions: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>class Superclass { }</FONT> 
            <P><FONT face=Courier>class Subclass1 extends Superclass { 
            }</FONT></P></TD></TR></TBODY></TABLE>and these objects: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>Superclass a = new 
            Superclass();</FONT> 
            <P><FONT face=Courier>Subclass1 b = new 
        Subclass1();</FONT></P></TD></TR></TBODY></TABLE>which of the following 
      explains the result of the statement: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>b = 
        (Subclass1)a;</FONT></TD></TR></TBODY></TABLE>Select the one right answer. 

      <P>
      <OL type=a>
        <LI>Illegal at compile time 
        <LI>Legal at compile time but possibly illegal at runtime 
        <LI>Definitely legal at runtime </LI></OL>
      <P><B>Question 27</B>: To invoke <FONT face=Courier>read()</FONT> from an 
      InputStream subclass, you must handle what type of exception? 
      <DIR>Fill in the blank. 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT 
      face=Courier>&nbsp;</FONT></TD></TR></TBODY></TABLE>&nbsp;</DIR><B>Question 
      28</B>: Imagine there are two exception classes called Exception1 and 
      Exception2 that descend from the Exception class. Given these two class 
      definitions: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>class First {</FONT> 
            <DIR><FONT face=Courier>void test() throws Exception1, Exception2 { 
            . . . }</FONT></DIR><FONT face=Courier>}</FONT> 
            <P><FONT face=Courier>class Second extends First {</FONT> 
            <DIR><FONT face=Courier>void test() { . . . }</FONT></DIR><FONT 
            face=Courier>}</FONT></TD></TR></TBODY></TABLE>Create a class called Third 
      that extends Second and defines a <FONT face=Courier>test()</FONT> method. 
      What exceptions can Third抯 <FONT face=Courier>test()</FONT> method throw? 

      <P>Select all valid answers. 
      <P>
      <OL type=a>
        <LI>Exception1 
        <LI>Exception2 
        <LI>no checked exceptions 
        <LI>any exceptions declared in the <FONT face=Courier>throws</FONT> 
        clause of the Third抯 <FONT face=Courier>test()</FONT> method. </LI></OL>
      <P>
      <P><B>Question 29</B>: What is the result of executing the following code: 

      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>class Test {</FONT> 
            <DIR><FONT face=Courier>public static void main(String[] args) 
            {</FONT> 
            <DIR><FONT face=Courier>Test t = new Test();</FONT> 
            <P><FONT face=Courier>t.test(1.0, 2L, 3);</FONT></P></DIR><FONT 
            face=Courier>}</FONT> 
            <P><FONT face=Courier>void test(double a, double b, short c) 
            {</FONT> 
            <DIR><FONT face=Courier>System.out.println("1");</FONT></DIR><FONT 
            face=Courier>}</FONT> 
            <P><FONT face=Courier>void test(float a, byte b, byte c) {</FONT> 
            <DIR><FONT face=Courier>System.out.println("2");</FONT></DIR><FONT 
            face=Courier>}</FONT> 
            <P><FONT face=Courier>void test(double a, double b, double c) 
            {</FONT> 
            <DIR><FONT face=Courier>System.out.println("3");</FONT></DIR><FONT 
            face=Courier>}</FONT> 
            <P><FONT face=Courier>void test(int a, long b, int c) {</FONT> 
            <DIR><FONT face=Courier>System.out.println("4");</FONT></DIR><FONT 
            face=Courier>}</FONT> 
            <P><FONT face=Courier>void test(long a, long b, long c) {</FONT> 
            <DIR><FONT face=Courier>System.out.println("5");</FONT></DIR><FONT 
            face=Courier>}</FONT></DIR><FONT 
      face=Courier>}</FONT></TD></TR></TBODY></TABLE>Select the one right 
      answer. 
      <P>
      <OL type=a>
        <LI>1 
        <LI>2 
        <LI>3 
        <LI>4 
        <LI>5 </LI></OL>
      <P>
      <P><B>Question 30</B>: Given this code snippet: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>double a = 90.7;</FONT> 
            <P><FONT face=Courier>double b = method(a);</FONT> 
            <P><FONT 
      face=Courier>System.out.println(b);</FONT></P></TD></TR></TBODY></TABLE>If 
      this snippet displays <FONT face=Courier>90</FONT> in the standard output, 
      what Math method did <FONT face=Courier>method()</FONT> invoke? 
      <P>Select all valid answers. 
      <P>
      <OL type=a>
        <LI><FONT face=Courier>abs()</FONT> 
        <LI><FONT face=Courier>min()</FONT> 
        <LI><FONT face=Courier>floor()</FONT> 
        <LI><FONT face=Courier>round()</FONT> 
        <LI><FONT face=Courier>ceil()</FONT> </LI></OL>
      <P><B>Question 31</B>: In Java 1.0.2, to make a Button object 
      non-responsive to mouse clicks, you can invoke which method? (Only supply 
      the method name, without a parameter list.) 
      <P>Fill in the blank. 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT 
      face=Courier>&nbsp;</FONT></TD></TR></TBODY></TABLE><B>Question 32</B>: 
      Given this code snippet: 
      <TABLE width="100%" border=1>
        <TBODY>
        <TR>
          <TD vAlign=center><FONT face=Courier>double a = 14.9;</FONT> 
            <P><FONT face=Courier>double b = method(a);</FONT> 
            <P><FONT 
      face=Courier>System.out.println(b);</FONT></P></TD></TR></TBODY></TABLE>If 
      this snippet displays 15 in the standard output, what Math method(s) could 
      <FONT face=Courier>method()</FONT> have invoke? 
      <P>Select the one right answer. 
      <P>
      <OL type=a>
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