📄 java练习题（附答案）_临渊羡鱼，不如退而结网_新浪博客.htm
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<DIV style="DISPLAY: inline"><B id=t_48fb20f001007w8k>Java练习题（附答案）</B> <SPAN
class=time>(2007-12-24 14:26:38)</SPAN> </DIV></DIV>
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标签：<A class=tag
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<TD vAlign=top align=right width=225>分类：<A
href="http://blog.sina.com.cn/s/articlelist_1224417520_2_1.html">VB/Java/C++/C#程序设计</A></TD></TR></TBODY></TABLE></DIV>
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<P>11.在Java语言有多种实现的机制，下列哪种技术属于垃圾回收机制？<BR> <WBR> <WBR> <WBR>
A、字节编译 B、内存跟踪 C、语法检查 D、堆栈上/下溢检查</P>
<P>12.编写和运行Java applet程序与编写和运行Java
application程序不同的步骤是<BR> <WBR> <WBR> <WBR> A、编写源代码</P>
<P> <WBR> <WBR> <WBR>
B、编写HTML文件调用该小程序，以.html为扩展名存入相同文件夹<BR> <WBR> <WBR> <WBR> C、编译过程
D、解释执行</P>
<P>13.下列哪个数代表八进制整数？<BR> <WBR> <WBR> <WBR> A、0Xa6 B、0144 C、1840
D、-1E3</P>
<P>14.下列正确的句子是<BR> <WBR> <WBR> <WBR> A、float 3.14; B、byte i=225;
C、k=33L; D、int p[][];</P>
<P>15.下列程序段的输出结果是<BR> <WBR> <WBR> <WBR> public class
operatorsandExpressions{<BR> <WBR> <WBR> <WBR> <WBR> <WBR>
void
stringPlus(){<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
int
x=3,y=4,z=5;<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.println(x+y+z);<BR> <WBR> <WBR> <WBR> <WBR> <WBR>
}<BR> <WBR> <WBR> <WBR> }<BR> <WBR> <WBR> <WBR>
A、xyz B、x+y+z C、12 D、以上答案均不正确</P>
<P>16.下列程序段的输出结果是<BR> <WBR> <WBR> <WBR> void
doublearithmaticOperator<WBR>(){<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.print(9/2);<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.print(",");<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.println(5/2.0);<BR> <WBR> <WBR> <WBR>
}<BR> <WBR> <WBR> <WBR> A、4.5,2.5 B、4,2 C、4.5,2 D、4,2.5</P>
<P>17.给出下面代码段：<BR> <WBR> <WBR> <WBR> public class
Test1{<BR> <WBR> <WBR> <WBR> <WBR> <WBR> public static
void main(String
args[]){<BR> <WBR> <WBR> <WBR> <WBR> <WBR> int
m;<BR> <WBR> <WBR> <WBR> <WBR> <WBR>
switch(m)<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
{<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
case 0:System.out.println("case
0");<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
case 1:System.out.println("case
1");break;<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
case
2:<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
default:System.out.println("default");<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
}<BR> <WBR> <WBR> <WBR> <WBR> <WBR>
}<BR> <WBR> <WBR> <WBR> }<BR> <WBR> <WBR> <WBR>
下列m 的哪个值将引起“default”的输出？<BR> <WBR> <WBR> <WBR> A、0 B、1 C、2
D、以上答案都不正确</P>
<P>18.下列程序的输出结果为<BR> <WBR> <WBR> <WBR> int
j=2;<BR> <WBR> <WBR> <WBR>
switch(j){<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
case
2:<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.println("Value is
two.");<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
case
2+1:<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.println("Value is
three.");<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
break;<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
default:<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.println("Value is
"+j);<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
break;}<BR> <WBR> <WBR> <WBR> A、Value is
two.<BR> <WBR> <WBR> <WBR> B、Value is
two.<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> Value
is three.<BR> <WBR> <WBR> <WBR> C、Value is
two.<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> Value
is three.<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
Value is 2<BR> <WBR> <WBR> <WBR> D、编译错误</P>
<P>19.下列哪个类声明是正确的?<BR> <WBR> <WBR> <WBR> A、abstract final class
Hl{…} B、abstract private move(){…}<BR> <WBR> <WBR> <WBR>
C、protected private number; D、public abstract class Car{…}</P>
<P>20.对于构造方法，下列叙述不正确的是<BR> <WBR> <WBR> <WBR>
A、构造方法是类的一种特殊方法，它的方法名必须与类名相同。<BR> <WBR> <WBR> <WBR>
B、构造方法的返回类型只能是void型，且书写格式是在方法名前加void前缀。<BR> <WBR> <WBR> <WBR>
C、构造方法的主要作用是完成对类的对象的初始化工作。<BR> <WBR> <WBR> <WBR>
D、一般在创建新对象时，系统会自动调用构造方法。</P>
<P>21.不使用static修饰符限定的方法称为成员方法，下列哪一个说法是不正确的？<BR> <WBR> <WBR> <WBR>
A、成员方法可以直接调用父类的成员方法</P>
<P> <WBR> <WBR> <WBR>
B、成员方法可以直接调用父类的类方法<BR> <WBR> <WBR> <WBR>
C、成员方法不可以直接调用其他类的成员方法</P>
<P> <WBR> <WBR> <WBR> D、成员方法可以直接调用本类的类方法</P>
<P>22.关于私有访问控制符private修饰的成员变量，以下说法正确的是<BR> <WBR> <WBR> <WBR>
A、可以被三种类所引用：该类自身、与它在同一个包中的其他类、在其他包中的该类的子类<BR> <WBR> <WBR> <WBR>
B、可以被种类访问和引用：该类本身、该类的所有子类<BR> <WBR> <WBR> <WBR> C、只能被该类自身所访问和修改
D、只能被同一个包中的类访问</P>
<P>23.关于以下程序段的说法正确的是<BR> <WBR> <WBR> <WBR> 1. public class
Myar{<BR> <WBR> <WBR> <WBR> 2. public static void main(String
argv[]){<BR> <WBR> <WBR> <WBR> 3. int[]i=new
int[5];<BR> <WBR> <WBR> <WBR> 4.
System.out.println(i[5]);<BR> <WBR> <WBR> <WBR> 5.
}<BR> <WBR> <WBR> <WBR> 6. }<BR> <WBR> <WBR> <WBR>
A、第2行编译出错 B、第4行编译出错<BR> <WBR> <WBR> <WBR> C、编译时产生错误
D、编译时没有产生错误，运行时发生异常</P>
<P>24.编译并且执行以下代码，会出现什么情况？<BR> <WBR> <WBR> <WBR> public class
Q{<BR> <WBR> <WBR> <WBR> <WBR> <WBR> public static void
main(String
argv[]){<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
int anar[]=new
int[]{1,2,3};<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
System.out.println(anar[1]);<BR> <WBR> <WBR> <WBR> <WBR>
}<BR> <WBR> <WBR> <WBR> }<BR> <WBR> <WBR> <WBR>
A、1 B、有错误，数组anar在初始化以前不能正常输出。<BR> <WBR> <WBR> <WBR> C、2
D、有错误，数组的大小没有定义。</P>
<P>25.如要抛出异常，应用下列哪种子句？<BR> <WBR> <WBR> <WBR> A、catch B、throw
C、try D、finally</P>
<P>26.对于catch 子句的排列，下列哪种是正确的？<BR> <WBR> <WBR> <WBR> A、父类在先，子类在后
B、子类在先，父类在后<BR> <WBR> <WBR> <WBR> C、有继承关系的异常不能在同一个 try
程序段内<BR> <WBR> <WBR> <WBR> D、先有子类，其他如何排列都无关</P>
<P>27.当输入一个字节流时，要<BR> <WBR> <WBR> <WBR> A、实现DataInput接口
B、实现ObjectInput接口<BR> <WBR> <WBR> <WBR> C、Serializable接口
D、继承Reader抽象类</P>
<P>28.字符输出流类都是____抽象类的子类。<BR> <WBR> <WBR> <WBR> A、FilterWriter
B、FileWrite C、Writer D、OutputStreamWrite</P>
<P>29.一个Java application 运行后，在系统中是作为一个<BR> <WBR> <WBR> <WBR> A、线程
B、进程 C、进程或线程 D、不可预知</P>
<P>30.关于以下程序段的执行结果，说法正确的是<BR> <WBR> <WBR> <WBR> public class
Borley extends
Thread{<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
public static void main(String
argv[]){<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
Borley b = new
Borley();<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
b.start();<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
}<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>public
void
run(){<BR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR> <WBR>
<WBR> System.out.println("Running");<BR> <WBR> <WBR> <WBR>
<WBR> }<BR> <WBR> <WBR> }<BR> <WBR> <WBR> <WBR>
A、编译通过并执行，但无输出 B、编译通过并执行，输出：Running<BR> <WBR> <WBR> <WBR>
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