Java复习题(三)阅读程序题-计算机(共16页).doc

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1、精选优质文档-倾情为你奉上JAVA程序设计复习题之（三）阅读程序题（计算机科学与技术专业使用）三、程序阅读题1阅读以下程序import java.io.*;public class Reverse2 public static void main(String args )int i,n=10; int a = new int10; try BufferedReader br = new BufferedReader( new InputStreamReader(System.in); ai = Integer.parseInt(br.readLine() ); catch (IOExcept

2、ion e) ; for (i= n-1; i = 0; i=i-2)System.out.print(ai+ ); System.out.println();请写出该程序的功能：该程序使用字符缓冲输入流从键盘输入10个数，然后倒序并间隔打印出来。2阅读以下程序import java.io.* ;public class abc public static void main(String args ) int i, s = 0 ; int a = 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120 ; for ( i = 0 ; i a.length

3、; i+ )if (i % 3 = 0) s += ai;System.out.println(s= + s);请写出该程序的输出结果：s=2603、阅读以下程序：import java.io.*;public class TestRandomAccess public static void main(String args) int data_arr=65,66,56,23,27,1,43,65,4,99; try RandomAccessFile randf=new RandomAccessFile(temp.dat,rw); for (int i=0; i=0; i=i-2) rand

4、f.seek(i*4); System,out.print( +randf.readInt(); randf.seek(40); System.out.println(randf.readUTF(); randf.close(); catch (IOException e) System.out.println(File access error: +e); 该程序的输出结果是：99 65 1 23 66 Good morning!4、阅读以下程序并填空。class _ extends Exception String mymsg=我自己定义的异常！; double mynum = 2.0;

5、MyException () super(首字母不能为A! )； MyException (String msg)_ /调用父类构造方法,参数为 msg public void displayme() System.out.println(mymsg); public double mymethod() return Math.sqrt(mynum); class ExceptionTest public static void main(String args) try if ( argsO.charAt(O)= A) MyException e = new MyException();Sy

6、stem.out.println(kkkk: + e.mymethod();e.displayme();Systemoutprintln(*in try*); _; /抛出异常e else if(argsO.charAt(O)= B) throw new MyException (第一个字符不应是B! )； else System.out.println(args0); catch ( _ ) System.out.println(aaa.getMessage(); aaa.displayme(); System.out.println( + aaa.mymethod(); catch( _

7、) System.out.println(命令行参数个数错！); 程序填空：MyException super(msg)throw eMyException aaaArrayIndexOutOfBoundsException5、阅读以下程序 import java.io.*；public class Test public static void main(String args) SubSubClass m=new SubSubClass(3,6,6);m.show(); class SuperClass int a,b; SuperClass(int x,int y) a=x; b=y;

8、class SubClass extends SuperClass int c; SubClass(int aa,int bb,int cc) super(aa,bb);c = cc; class SubSubClass extends SubClass int a； SubSubClass(int aa,int bb,int cc) super(aa,bb,cc);a = aa + bb + cc; void show() System.out.println(a=+ a +nb=+ b +nc=+ c); 请写出该程序的运行结果：a=60b=20c=306、阅读以下程序import jav

9、a.io.*;public class abc public static void main(String args) String sl = Hello!;String s2 = new String(World!);System.out.println(sl.concat(s2); 请写出该程序的运行结果：Hello!World!7、阅读以下程序import java.io.*;public class Class1 public static void main(String args)int i，max，min；int a = 12,67,8,98,23,56,124,55,99,1

10、00);max= min= a0;for(i=1; ia.length; i+)if( ai max) max = ai;System.out.println( max + + min);System.out.println(); 请写出该程序完成的功能：在数组中查找并输出最大值和最小值。8、阅读以下程序import java.awt.*;import java.applet.Applet;public class DrawMylmage extends Applet Image myImage; /定义一个图像类Image的对象myImage public void init()myImag

11、e= getImage(getDocumentBase(),pica.jpg); public void paint(Graphics g) g.drawImage(myImage,0,0,this); 请写出该程序的功能：在Applet界面中显示当前文件夹下名为“pica.jpg”的图像。9、阅读以下程序并填空。import java.awt.*;import java.applet.*;import .*;public class Mypicture _ Applet Image image; public void _() try image=getlmage(new URL(getCo

12、deBase(),image.gif); _(MalformedURLException e) public void paint(Graphics g) g.drawlmage(image,0,0,_); public void start() _();程序填空题：extends init catch this repaint10、阅读以下程序：public class Sum public static void main( String args) double sum = 0.0 ; for ( int i = 1; i= 100; i + ) sum += i;, System.ou

13、t.println( sum= + sum ); 该程序完成的功能是：求sum=1+2+3+.+100的和。11、阅读以下程序：class SuperClass int a,b; SuperClass(int x,int y) a=x; b=y; voidshow() System.out.println(a=+ a + nb=+ b); class SubClass extends SuperClass int c; SubClass(int aa,int bb,int cc) super(aa,bb);c=cc; voidshow() System.out.println(c=+ c +n

14、a=+ a +nb=+ b);class SubSubClass extends SubClass int a; SubSubClass(int aa,int bb,int cc) super(aa,bb,cc);a=aa+bb+cc; void show()System.out.println(a=+ a +nb=+ b +nc=+ c); class test public static void main(String args) SuperClass p=new SubSubClass(10,20,30);p.show();该程序的输出结果是：a=60b=20c=3012、阅读以下程序

15、：import java.io.*;publiic class Test public static void main(String args) AB s = new AB(Hello!,I love Java.);System.out.println( s.toString() ); class AB String sl; String s2; AB( String strl, String str2 ) sl = str1; s2 = str2; public String toString() return sl + s2; 该程序的输出结果是：Hello!I love Java.13

16、、阅读以下程序，并填空。import _class MyCopy public static void main(Stringo args) int ch;FileInputStream fin;_ fout;try fin = new FileInputStream(args0);fout = new FileOutputStream(_);ch = fin.read();while(ch!=-1) _ch = fin.read();fin.close(); fout.close(); catch (_ e1) System.out.println(使用格式错误！正确格式为：java myc

17、opy源文件名目标文件名);System.exit(0); catch (FileNotFoundException e3) System.out.println(文件没有找到！); catch (IOException e2) System.out.println(流错误！); 程序填空：import java.io.*;FileOutputStreamargs0fout.write(ch);ArrayIndexOutOfBoundsException14、阅读以下程序import java.io.*；public class Reverse public static void main(

18、String args) int i,n=10;int a = new int10;for(i=0; i= 0; i-)System.out.print(ai+ );System.out.println(); 请写出此程序功能：程序运行时从键盘输入10个整数，然后倒序输出。15、阅读以下程序import java.io.* ;public class Test public static void main(String args ) int i, s = 0;int a = 10, 20, 30, 40, 50, 60, 70, 80, 90;for ( i = 0 ; i a.length

19、; i+ )if(ai % 3 = 0) s += ai;System.out.println(s= + s);请写出此程序的输出结果：s=18016、阅读以下程序（提示：注意同步）class One synchronized void display(int num) System.out.println(two + num);try Thread.sleep(1000); catch (InterruptedException e) System.out.println(”中断”)；System.out.println(”完成”)； class Two implements Runnabl

20、e int number; One one; Thread t; public Two(One one_num, int n) one = one_num;number = n;t = new Thread(this);t.start(); public void run()one.display(number);public class Synch public static void main(String args) throws InterruptedException One one = new One();int digit = 100;Two s1 = new Two(one,d

21、igit);Two s2 = new Two(one,digit);Two s3 = new Two(one,digit);Two s4 = new Two(one,digit);s1.t.join();s2.t.join();s3.t.join();s4.t.join();System.out.println(Synch结束！); 此程序的输出结果是：two 100完成two 100完成two 100完成two 100完成Synch 结束！17、阅读以下程序，并填空。import _ ;class FileTypepublic static void main(String args)_;

22、try FileReader fis = new_(args0);BufferedReader reader = new BufferedReader( );String s；while(s=reader.readLine()!=_) System.out.println( +(i+)+: + s);fis.close();reader.close(); catch (IOException e) System.out.println(e); catch (_ e1) System.out.println(“缺少命令行参数！”); 程序填空：java.io.*;int i;FileReader

23、fisnullArrayIndexOutOfBoundsException18、阅读以下程序：public class Sum public static void main(String args) double sum = 0.0：for (int i=1; i=100; i+)sum += i*i；System.out.println( sum=+sum); 该程序的功能是：求出sum的值为1到100的平方和。19、阅读以下程序：class Example public static void main(String args) int a = new int33;a00=1; a11=

24、1; a22=1;System.out.println(数组a：);for (int i=0; i a.length; i+) for(int j=0; j ai.length; j+)System.out.print(aij + );System.out.println(); 该程序的输出结果是：1 0 00 1 00 0 120、阅读以下程序：public class Test2static boolean foo(char c)System.out.print(c);return true; public static void main(String args)int i = 0：fo

25、r(foo(A); foo(B) & (i2); foo(C)i+;foo(D); 此程序的输出结果是：ABDCBDCB21、阅读以下程序，并填空。import _;import java.awt.event.*;public class OvalDrawer extends Frame implements Runnable private Color colors= Color.RED,Color.BLACK,Color.BLUE,Color.GREEN,Color.DARK_GRAY ; private Color color; private int x=l0,y=10,width=1

26、0,height=10; public OvalDrawer(String title)super(title);_; /设置窗口大小为300*300setVisible(true);_; /创建线程并启动 public void run() while(true) x = (int)(Math.random0*300);y = (int)(Math.random0*300);width = (int)(Math.random()*100);height = (int)(Math.random()*100);color = colors(int)(Math.random()*(colors.l

27、ength-1);_; /刷新窗口内容try Thread.sleep(400); catch(InterruptedException e) throw new RuntimeException(e); public void paint(Graphics g)g.setColor(color);_; /画椭圆 public static void main(String args) new OvaIDrawer(hello); 程序填空：java.awt.*;setSize(300,300);new Thread(this).start();repaint();g.drawOval(x,y

28、,width,height);22、阅读以下程序：public class Sum public static void main(String args) double sum = 0.0；for (int i=1; i=100; i+) sum += 1.0 / (double)i;System.out.println(sum=+sum); 此程序完成的功能是：求解sum=1+1/2+1/3+.+1/100的值并打印输出。23、阅读以下程序：import java.awt.*;import java.applet.Applet;public class Applet1 extends Ap

29、plet public void paint(Graphics g) g.drawLine(30,5,100,45);g.drawRect(30,50,50,20);g.drawOval(30,80,50,40);g.drawString(They are figures! ,30,150); 此程序完成的功能是：在Applet界面中显示一些由直线、矩形框、椭圆框和文字组成的图形。24、阅读以下程序：import java.io.*;public class Test public static void main(String args) int i;int a=11,22,33,44,55

30、,66,77,88,99;for(i=0; i = a.length/2; i+)System.out.print(ail + aa.length-i-1 + );System.out.println(); 此程序的输出结果是：110 110 110 110 11025、阅读程序并填空import java.awt.*;import java.applet.*;public class DrawStringDemo _ Applet private Font afont = _Font(Helvetica,Font.BOLD,18); public void init() _(Color.bl

31、ack); public void paint(Graphics g) g.setColor(Color.green);_(afont);_(This is a test,10,40); 程序填空：extends new setBackground setFont drawString26、阅读以下程序public class Test( public static void main(String args)System.out.printf(sqrt(2.0)=%f, Math.sqrt(2.0); 此程序的输出是：sqrt(2.0)=1.27、阅读以下程序public class Sum

32、Test public static void main(String args) double sum = 0.0;for(int i=1; i 0 ) y = 2 * x;else if( x = 0) y = 2 + Math.cos(x);else y = x * x + 1; System.out.println(y= + y); 此程序完成的功能是：从键盘输入一个数x，根据x的值求出相应的y值。 2*x x0y= 2 + cos(x) x=0 x2+1 x029、阅读以下程序，完成填空，使其完整。import _;class Rectangle public static void

33、 main(String args) _w,l,S,s; /定义变量Scanner keyin = new Scanner(System.in);System.out.print(”请输入长方形的长：”);l = keyin.nextDouble();System.out.print(”请输入长方形的宽：”);w = _ ; /输入宽S = _ ; /计算面积并保存在S中s = _ ; /计算周长并保存在s中System.out.println(此长方形的面积：+ S +n此长方形的周长： +s); 程序填空：java.util.Scanner或java.util.*doublekeyin.n

34、extDouble()w*l(w+l)*230、阅读以下程序：public class Sum public static void main(String args) double sum = 0.0；for(int i = 1; i = 100; i+)sum += i*i*i;System.out.println(”sum=” + sum); 此程序完成的功能是：计算并输出1到100的立方和sum值。31、阅读以下程序class Test public static void main(String args)int i = 1;do if (i % 3 = 0)System.out.print(” ”+i);i+; while(i = 20); 此程序的输出结果是：3 6 9 12 15 1832、阅读以下程序class Test int a; static int b; Test() a=20; b=30; public