2021年JAVA语言程序设计期末考试试题及答案应考必备题库五.doc

<p>《JAVA语言程序设计》期末考试试题及答案5（应考必备题库）
一、 单选题
1、当某一线程正处在休眠状态，而另一种线程用 Thread 类中 interrupt() 办法中断它时，抛出异常类型是（ &nbsp; &nbsp;）。
A) IOException &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B) RuntimeException
C) InterruptedException &nbsp; &nbsp; D) ClassNotFoundException
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
2、下面程序段功能是( &nbsp;)。
File file1=new File(&quot;d:\\xxx\\yyy\\zzz&quot;);
file1.mkdirs();
A)在当前目录下生成子目录：\xxx\yyy\zzz &nbsp; &nbsp; B)生成目录： e:\xxx\yyy\zzz
C)在当前目录下生成文献xxx.yyy.zzz &nbsp; &nbsp; &nbsp; &nbsp; D)以上说法都不对
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
3、应用程序main办法中有如下语句，则输出成果是 ( &nbsp; )。
String s = &quot;xxxxxxxxxxxxxxx#123#456#zzzzz&quot;;
int n = s.indexOf(&quot;#&quot;);
&nbsp; &nbsp; int k = s.indexOf(&quot;#&quot;，n+1);
String s2 = s.substring(n+1，k);
System.out.println(s2);
A) 123456 &nbsp; &nbsp; B) 123 &nbsp; &nbsp; C) xxxxxxxxxxxxxxx &nbsp; &nbsp; &nbsp;D) zzzzz
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
4、关于下面程序Test.java说法对的是( &nbsp; &nbsp;)。
public class Test {
&nbsp; &nbsp;String x=&quot;1&quot;； &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp;int y;
&nbsp; &nbsp;public static void main(String args[]) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;int z=2； &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;System.out.println(x+y+z)；
&nbsp; &nbsp;} &nbsp;
}
A)3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B)102 &nbsp; &nbsp; &nbsp; &nbsp;C) 12 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D)程序有编译错误
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
5、应用程序main办法中有如下语句，则输出成果是 ( &nbsp; )。
int &nbsp;b[][]={{1，1，1}，{2,2}，{3}};
&nbsp; &nbsp; &nbsp; &nbsp;int sum=0;
&nbsp; &nbsp; &nbsp; &nbsp;for(int i=0；i&lt;b.length；i++) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;for(int j=0；j&lt;b[i].length；j++) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;sum+=b[i][j];
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;}
&nbsp; &nbsp; &nbsp; &nbsp;System.out.println(&quot;sum=&quot;+sum);
A) 10 &nbsp; &nbsp; B)6 &nbsp; &nbsp; C) 9 &nbsp; &nbsp; D) 13 &nbsp; &nbsp; &nbsp;

6、应用程序main办法中有如下语句，则执行后输出成果是 ( &nbsp; )。
int[] x = {125,21,5,168,98};
int min = x[0];
for (int i=1；i&lt;x.length；i++){
if(x[i] &lt; min)
min = x[i];
}
System.out.println(min);
A) 125 &nbsp; &nbsp; B) 5 &nbsp; &nbsp; C) 98 &nbsp; &nbsp; &nbsp; &nbsp;D) 168 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
7、应用程序main办法中有如下语句，则输出成果是 ( &nbsp; )。
Hashtable hashtable=new Hashtable();
hashtable.put(&quot;100&quot;,&quot;aaa&quot;);
hashtable.put(&quot;200&quot;,&quot;bbb&quot;);
hashtable.put(&quot;300&quot;,&quot;ccc&quot;)；
System.out.println(hashtable.get(&quot;300&quot;).toString()
+ hashtable.get(&quot;200&quot;).toString()
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; + hashtable.get(&quot;100&quot;).toString())； &nbsp; &nbsp; &nbsp;
A) aaa &nbsp; B) bbb &nbsp; &nbsp;C) ccc &nbsp; D) cccbbbaaa
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
8、如下关于java异常说法不对的是（ &nbsp;）。
A) Throwable 类是 Java 语言中Error类和Exception类父类。
B)当异常对象是Exception类（或其子类）实例时，能通过 Java 虚拟机或者 throw 语句抛出该异常对象，并能通过try…catch…finally解决。
C)如果只用一种catch块捕获各种异常对象，则catch 子句中参数类型应是所有异常对象父类。
D)以上说法都不对。

9、下面程序创立了一种文献输出流对象，用来向文献test.txt中输出数据，假设程序当前目录下不存在文献test.txt，编译下面程序Test.java后，将该程序运营3次，则文献test.txt 内容是( &nbsp;)。
import java.io.*;
public class Test {
public static void main(String args[]) {
try {
String s=&quot;ABCDE&quot;;
byte b[]=s.getBytes();
FileOutputStream file=new FileOutputStream(&quot;test.txt&quot;，true);
file.write(b)； &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
file.close();
}
catch(IOException e) {
System.out.println(e.toString());
}
}
}
A) ABCABC &nbsp; B) ABCDE &nbsp; &nbsp; C)Test &nbsp; &nbsp;D) ABCDE ABCDE ABCDE &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp;
10、下面说法不对的是( &nbsp;)？
A)列表(List)、集合(Set)和映射(Map)都是java.util包中接口。
B)List接口是可以包括重复元素有序集合。
C)Set接口是不包括重复元素集合。
D)Map接口将键映射到值，键可以重复，但每个键最多只能映射一种值。

二、多选题
1、下面哪些核心字能用来控制对类成员访问( &nbsp;)？
A) public &nbsp; B) protected &nbsp; &nbsp;C) private &nbsp; &nbsp; D) default
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
2、下面关于Java中异常解决try块说法对的是( &nbsp; &nbsp;)?
A) try块后普通应有一种catch 块，用来解决try块中抛出异常。 &nbsp;
B) catch 块后必要有finally块。
C)也许抛出异常办法调用应放在try块中。 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
D)对抛出异常解决必要放在try块中

3、线程对象生命周期中,普通经历下面哪些状态（ &nbsp; &nbsp; ）。
A)新建 &nbsp; &nbsp; &nbsp;B)运营 &nbsp; &nbsp; &nbsp;C)就绪 &nbsp; &nbsp; &nbsp;D)死亡 &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
4、定义如下二维数组b，下面说法对的是( &nbsp;)。
int b[][]={{1，2，3}，{4，5},{6，7，8}}};
A)b.length值是3。 &nbsp; B)b[1].length值是3。
C)b[1][1]值是5。 &nbsp; D) 二维数组b第一行有3个元素 &nbsp;

5、类B是一种抽象类，类C是类B非抽象子类，下列创立对象x1语句中对的是( &nbsp; )。
A) B x1= new B( )； &nbsp; &nbsp; &nbsp; B) B x1= new C( )； &nbsp;
C) C x1=new C( )； &nbsp; &nbsp; &nbsp; &nbsp;D) C x1= new B( );

6、下面关于进程、线程说法对的是( &nbsp; &nbsp;)。
A)进程是程序一次动态执行过程。一种进程在其执行过程中，可以产生各种线程——多线程，形成多条执行线索。
B)线程是比进程更小执行单位，是在一种进程中独立控制流，即程序内部控制流。线程自身不能自动运营，栖身于某个进程之中，由进程启动执行。
C)Java多线程运营与平台有关。
D)对于单解决器系统，各种线程分时间片获取CPU或其她系统资源来运营。对于多解决器系统，线程可以分派到各种解决器中，从而真正并发执行多任务。

7、下面关于外部类和内部类成员互相访问规则中，对的选项是( &nbsp; &nbsp;)。
A)内部类可以直接访问外部类成员
B)外部类可以直接访问内部类成员
C)外部类不能访问内部类成员
D)外部类可通过创立内部类实例来访问内部类成员

三、程序阅读题
1、阅读下面程序代码，并回答问题(u问3分，v问3分，共6分)。
String s1 = new String(&quot;abcde&quot;);
String s2 = new String(&quot;abcde&quot;)；
boolean b1= s1.equals(s2);
boolean b2 = s1== s2； &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
System.out.print(b1+&quot; &nbsp; &quot;+b2)； &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
u程序段执行后，在命令行输出成果如何？
v解释输出(1)成果因素？
答案：
u true &nbsp;false
vequals办法比较两个字符串内容与否相等；运算符“==”判断两个对象与否指向同一种引用，即与否为同一种对象。

2、阅读下面程序，并回答问题(u问3分，v问3分，共6分)。
import java.io.*;
public class Test {
&nbsp; &nbsp;public static void main(String args[]) throws IOException {
&nbsp; &nbsp; &nbsp; &nbsp;BufferedReader buf=new BufferedReader(
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;new InputStreamReader(System.in))； &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;while(true) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;String str = buf.readLine();
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if(str.equals(&quot;quit&quot;))
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;break;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;int x=Integer.parseInt(str);
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;System.out.println(x*x);
&nbsp; &nbsp; &nbsp; &nbsp;}
&nbsp; &nbsp;} &nbsp;
}
编译运营上面程序：
u从键盘输入10，回车后输出成果如何？
v从键盘输入exit，回车后程序能对的执行吗？为什么？
答案：
u100 &nbsp;
v不能；由于办法Integer.parseInt(str)不能将字符串“exit”转化为整数，抛出异常。
3、写出下面程序编译、运营后成果(6分)。
public class Test{
&nbsp; &nbsp; public static void main(String args[]) {
&nbsp; &nbsp; &nbsp; &nbsp; new Student(&quot;Tom&quot;，&#39;m&#39;，90，88);
&nbsp; &nbsp; &nbsp; &nbsp; new Student(&quot;Jack&quot;，&#39;m&#39;，66，89);
&nbsp; &nbsp; &nbsp; &nbsp; new Student(&quot;Mary&quot;，&#39;f&#39;，76，86);
&nbsp; &nbsp; &nbsp; &nbsp; System.out.println(&quot;name\tsex\tchinese\tenglish&quot;);
&nbsp; &nbsp; &nbsp; &nbsp; Student.print();
&nbsp; &nbsp; }
}

class Student {
&nbsp; &nbsp; protected &nbsp;String &nbsp; name;
&nbsp; &nbsp; protected &nbsp;char &nbsp; &nbsp; sex;
&nbsp; &nbsp; protected &nbsp;int &nbsp; &nbsp; &nbsp;chinese;
&nbsp; &nbsp; protected &nbsp;int &nbsp; &nbsp; &nbsp;english;
&nbsp; &nbsp; protected &nbsp;Student &nbsp;next;
&nbsp; &nbsp; static Student list;
&nbsp; &nbsp;
&nbsp; &nbsp; Student (String name，char sex，int chinese，int english) &nbsp; {
&nbsp; &nbsp; &nbsp; &nbsp; this.name=name;
&nbsp; &nbsp; &nbsp; &nbsp; this.sex=sex;
&nbsp; &nbsp; &nbsp; &nbsp; this.chinese=chinese;
&nbsp; &nbsp; &nbsp; &nbsp; this.english=english;
&nbsp; &nbsp; &nbsp; &nbsp; this.next=list;
&nbsp; &nbsp; &nbsp; &nbsp; list=this;
&nbsp; &nbsp; }
&nbsp; &nbsp; static void print() {
&nbsp; &nbsp; &nbsp; &nbsp; Student friend=list;
&nbsp; &nbsp; &nbsp; &nbsp; if (friend==null)
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(&quot;The list is empty.&quot;);
&nbsp; &nbsp; &nbsp; &nbsp; else {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; do{
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(friend.toString());
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; friend=friend.next;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }while(friend!=null);
&nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; }
&nbsp; &nbsp; public String toString() &nbsp;{
&nbsp; &nbsp; &nbsp; &nbsp; return new String(name+&quot;\t&quot;+sex+&quot;\t&quot;+chinese+&quot;\t&quot;+english);
&nbsp; &nbsp; }
}
答案：
name &nbsp; &nbsp;sex &nbsp; &nbsp; chinese &nbsp;english
Mary &nbsp; &nbsp;f &nbsp; &nbsp; &nbsp; 76 &nbsp; &nbsp; &nbsp;86
Jack &nbsp; &nbsp; m &nbsp; &nbsp; &nbsp;66 &nbsp; &nbsp; &nbsp;89
Tom &nbsp; &nbsp; m &nbsp; &nbsp; &nbsp;90 &nbsp; &nbsp; &nbsp;88</p>