Java程序设计基础本部(B).doc

装订线内不要答题，装订线外不要写姓名、学号、学院专业年级班签个人信息，违者试卷作0分处理考 点 号教 室 号姓 名学 院专 业年 级班 号学号（全号）湖南农业大学课程考核试卷课程名称（全称）：Java程序设计基础（双语） 课程代码：30656B0考核时间：2008 年 月 日 试卷号： B考核对象：信息工程051、信息工程052大题号一二三四五六七八九十总分题分4020201010得分 得分I、Choose one correct answer（Total 40 points，each question 2 points）1. Which of the following are Java modifiers? (A )A. public B. true C. friendly D. transient2. Choose the valid identifier from those listed below. ( A) A. MyMethod B. 3byte C. 5_const D. true3.Which are legal declarations? ( A BD )A. short x ; B. short y; C. short y2 = 5; D. short z ; 4. Given the following code:class Top public Top(String s) System.out.print(B); public class Bottom2 extends Top public Bottom2(String s) System.out.print(D); public static void main(String args) new Bottom2(C); System.out.println( ); Whats the result when we compile and run the preceding code?( D )A. BD B. DB C. BDC D. Compilation fails5. What is the return value of the main() method in Java? ( D )A. String B. int C. char D. void6. Given the following, class X void dol() class Y extends X void do2() class Chrome public static void main(String args) X x1 = new X(); X x2 = new Y(); Y y1 = new Y(); / insert code here Which, inserted at line 8, will compile? ( C )A. x2.do2( ); B. (Y) x2. do2( ); C. (Y)x2).do2(); D.None of the above statements will compile.7. Which of the following assignments is NOT legal? ( A )A. float a = 2.0 B. double b = 2.0 C. int c = 2 D. long d = 28. Given the following command to run a correct class: java MyTest a b cWhich statement is true? ( D )A. args0 = MyTest a b c B. args0 = MyTestC. args0 = a D. args1= “b”9. Given the following code:switch (m) case 0: System.out.println(Condition 0); case 1: System.out.println(Condition 1); case 2: System.out.println(Condition 2); case 3: System.out.println(Condition 3);break; default: System.out.println(Other Condition);Which values of m will cause Condition 2 is output? ( A )A. 0,1 and 2 B. only 1 C. 3 D. 410. Which modifier is NOT legal in Java? ( D )A. private B. public C. protected D. protect11. Which method is used to define the execution body of a thread? ( C )A. start() B. init() C. run() D. main()12. Given the following class definition in one source file:class Base public Base () /. public Base ( int m ) /. protected void fun( int n ) /. public class Child extends Base/ member methodsWhich methods can be added into the Child class correctly? ( c )A. private void fun( int n ) /.B. void fun ( int n ) /. C. protected void fun ( int n ) /. D. public m() /. 13.Given the following code: Integer i = new Integer(42);Long m = new Long(42);Integer d = new Integer(42);Which expression evaluate to True? ( D )A. (i = =m) B. (i = = d) C. (d = m) D. (i.equals (d)14.Given the following code: public interface Runnable void run(); Which construct an anonymous inner class instance? ( c )A. Runnable r = new Runnable() ; B. Runnable r = new Runnable public void run(); C. System.out.println(new Runnable() (public void run() ); D. System.out.println(new Runnable(public void run() ); 15. Give the code fragment: switch(x) case 1:System.out.println(“Test 1”);break; case 2: case 3:System.out.println(“Test 2”);break; default:System.out.println(“end”); which value of x would cause “Test 2” to the output: ( BC )A. 1 B. 2 C. 3 D. default 16. When a subclass method has the same name,parameter list, and return type as a method in the parent class, this method is said to be what? ( D )A. Extended B. Overloaded C. Overextended D. Overridden17.public class Test public static void main(String args) new Test().foo(1,2); private void foo(int a, int b) System.out.println(“int”); private void foo(long a, int b) System.out.println(“long”); What will happen when you compile and run this program? ( A )A. The code will compile and run, and display int.B. The code will compile and run, and display long. C. The code will not compile.D. The code will compile,but throw a runtime exception when executed.18. Given the following code:public class Test public static void main(String args) new Test(4); public Test() System.out.println(“okay”); public Test(int i) / insert code here Which of the following lines of code should be inserted so that the output of the program is okay? ( D )A. super(); B. this; C. Test(); D. this();19. Given the following code:class Testpublic static void main(String args) String a = args1; String b = args2; String c = args3; If you will execute java Test cat dog sheep what will be the value of c? ( D )A. dog B. sheep C. Compilation Error D. Exception will occur20.Which statement is true about an inner class? ( D )A. It must be anonymous B. It can not implement an interface C. It is only accessible in the enclosing class D. It can access any final variables in any enclosing scope.得分II、Decide correct or wrong（Total 20 points，each question 2 points， “”means right, “X” means wrong）1.Java is a kind of object-oriented programming language. （ ） 2.Given: Stringstr=newString(abc); We create two objects using the preceding statement.（ ） 3.Final class can not be extended.（ ）4.Abstract class and interface are the same.（ ）5. Constructors do not have a return type not even void. ( )6.All methods in a interface are abstract methods. ( )7.A static method cannot be overridden.（ ）8.A File object encapsulates the properties of a file or a path, it contains the methods for reading/writing data from/to a file. （ ）9.Letter A and letter a are the same in Java.（ ）10.All classes share a single root, the Object class. ( )得分III、Fill the following blanks（Total 20 points，each blank except last two 2 points）1Finish the following code.（ Case-sensitive）Function description：Read a line of file “myfile”Variable description：stream is an InputStream object corresponding to myfile S is a String objectInputStreamReader reader = new InputStreamReader (（1） stream );BufferedReader buffer = new BufferedReader( （2） reader );S =（3） buffer . （4） readLine() ; 2Display “Hello” every other 10 seconds.public class Test （5） implements Runnable public static void （6main） (String args) Test t=new Test(); （7） Thread tt=new Thread(t); tt. （8） start() ; public void run() for(;) try （9）Thread.sleep(10000) ; catch(（10） InterruptedException e) Systm.out.println(“Hello”); 得分IV、Write the results after code is executed.（Total 10 points，each question 5 points）1.Given the following code:class Emu static String s = -; public static void main(String args) try throw new Exception(); catch (Exception e) try try throw new Exception(); catch (Exception ex) s += ic ; throw new Exception(); catch (Exception x) s += mc ; finally s += mf ; finally s += of ; System.out.println(s); Running the preceding code prints: ic mc mf of 2.Given the following code:public class WaitTest public static void main(String args) System.out.print(“1 ”); synchronized(args) System.out.print(“2 ”); try args.wait(); catch(InterruptedException e) System.out.prin