08-09第一學(xué)期java高級編程卷

1、。裝。訂。線。2008 年2009 年第一學(xué)期Java 高級編程期末試題A 卷時(shí)間共 120 分鐘說明：盡量用英文答題，用中文答題酌情扣分一、單項(xiàng)選擇題（每題 2 分，共 30 分）1. Which declaration for the maA public main(String args)ethod is valid ()B public s ic void main(String args) C private s ic void main(String args) D void main()Which line is wrong for the below codes (String

2、 str = null;if (str != null) & (str.length() 10) )3) System.out.pr4) ln(moren 10);5) else if (str != null) & (str.length() 0 ) 5) j = I * 2;6) System.out.pr 7) k = k + 1;8) I-;9) 10) ln ( The value of j is + j );Then which line will be wrong when running the codes? ()A line 4B line 6C line 7D line 8

3、9. The variable MAX_LENGTH, which value is constant 100, will be declared asand public, thenwe should do ()A publicMAX_LENGTH=100;B finalMAX_LENGTH=100;C final public D public finalMAX_LENGTH=100; MAX_LENGTH=100.There are codes as follows:public class Test 2)m, n;3) public Test() 4) public Test(a) m

4、=a; public sTest t1,t2;ic void main(String arg) 7)j,k;8) j=0; k=0;t1=new Test();t2=new Test(j,k);11) 12) Then, when compiling the codes, which line will appear errors ()A line 3B line 5C line 6D line 1011. When throwing an exception, which keyword should be used ()A transientB finallyC throw)C java.

5、awtD sic12. The class System belongs to (A java.utilB java.ioD java.lang)Which declaration about Applet is right (There needs main() in Applet programsApplet classes must inherit java.awt.AppletC. Applet can acs local filesD. Applet programs do not need to compile14. There are codes as follows: publ

6、ic class testsica = new a10;public sic void main(String args) System.out.prln(arr10);Then which is right ()There will be errors when compilingIt is right when compiling, but there will be errors when runningThe output is 0The output is null15. To read 10 bytes from the file file.dat andthem to varia

7、ble c, then we should do ()A FileInputStream in=new FileInputStream(file.dat); in.skip(9); B FileInputStream in=new FileInputStream(file.dat); in.skip(10);c=in.read();c=in.read();C FileInputStream in=new FileInputStream(file.dat);c=in.read();D RandomAcsFile in=new RandomAcsFile(file.dat); in.skip(9)

8、;c=in.readByte();二、填空題（每題 1.5 分，共 30 分）1. The entry poof Threads is 2. Creating an object of class X and naming the objex1, Please write the sement:3. There are two important types of sockets:and 4. Running the two following sements, what are the results: String s=我喜歡學(xué)習(xí) Java！;System.out.prln(s.lengt

9、h();5. Compiling Java source files with the compiler produ with the suffixfiles6. Java I/O streamse two types: byte streams and character streams. FileInputStream belongs tobyte stream, BufferedWriter belongs to 7. If a class in a java program is declared as, the program name should be same asthe cl

10、aame.8. Please write out the results of the below program:public class Test extends TT public void main(String args) Test t = new Test(Tom);public Test(String s) super(s);System.out.prpublic Test()ln(How do you do?);this(I am Tom);class TT public TT()System.out.prln(What a pleasure!);public TT(Strin

11、g s) this();System.out.prln(I am +s);9. Filling appropriate information import java.awt.*;import java.applet.Applet;he bls.public classoJavaApplet extends /there define an applet class得分閱卷人public void pa(Graphics g)Font f=new Font(黑體,Font.BOLD,48);/在 Applet 程序中顯示的內(nèi)容字體設(shè)為 fg.drawString(o World!,55,55)

12、;10. There is an java source file as follows:public calss aaaclass bbbpublic sic void main( String args)Then, the file should be named as , theds of compiling it areAnd theds of running it are 11. Filling appropriate informationhe bls.publlic class x, y;Myclass (i, ) / Constructor（構(gòu)造器）x=i;y=j;12. Ja

13、va program has two types: and 三、簡答題（共 25 分）1. What are method overloading and method overriding? Please give examples to describe them. (10 分)2. (6 分)得分閱卷人public classTypepublic sic void main(String args ) byte x1=0 x55;byte x2=0 x552; short x3=0 x1234; short x4=0 x12345;x5=0 x123456789;System.out.prln(x5);Then after compiling above program, what e