Java复习题阅读程序题软件

1、word JAVA程序设计 复习题之三阅读程序题三、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 (IOException e) ; for (i= n-1; i

2、 >= 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 ; i

3、+ )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"

4、); for (int i=0; i<data_arr.length; i+) randf.writelnt(data_arri); randf.writeUTF("Good morning!"); ' for(int i=data_arr.length-l; i>=0; i=i-2) randf.seek(i*4); System,out.print(" "+randf.readInt(); randf.seek(40); System.out.println(randf.readUTF(); randf.close(); catc

5、h (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; 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 v

6、oid 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();System.out.println("kkkk:" + e.mymethod();e.displayme();Systemoutpr

7、intln("*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(); n("" + aaa.mymethod(); catch( _ ) System.out.println("命令行参数个数

8、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; class SubClass extends

9、 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

10、以下程序import java.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

11、；int a = 12,67,8,98,23,56,124,55,99,100);max= min= a0;for(i=1; i<a.length; i+)if( ai< min) min = ai;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 DrawMy

12、lmage extends Applet Image myImage; /定义一个图像类Image的对象myImage public void init()myImage= 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 .

13、*;public class Mypicture _ Applet Image image; public void _() try image=getlmage(new URL(getCodeBase(),'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 pub

14、lic static void main( String args) double sum = 0.0 ; for ( int i = 1; i<= 100; i + ) sum += i;, System.out.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 + "

15、;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 +"na="+ a +"nb="+ b);class SubSubClass extends SubClass int a; SubSubClass(int aa,int bb,int cc) super(aa,bb,cc);a=aa+bb+cc;

16、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：import java.io.*;publiic class Test public static void main(String args) AB s = ne

17、w 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、阅读以下程序，并填空。import _class MyCopy public static void main(St

18、ringo 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 mycopy源文件名目标文件名");System.exit(0); catch (FileNotFou

19、ndException 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(String args) int i,n=10

20、;int a = new int10;for(i=0; i<n; i+)try BufferedReader br= new BufferedReader(new InputStreamReader(System.in);ai=Integer.parseInt(br.readLine(); /输入一个整数 catch (IOException e) ;for (i = n-1; 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、

21、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; 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 displa

22、y(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 Runnable int number; One one; Thread t; public Two(One one_num, int n) one = one_num;number = n;t = new Thread(this);t.star

23、t(); 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,digit);Two s2 = new Two(one,digit);Two s3 = new Two(one,digit);Two s4 = new Two(one,digit);in();s2.t.join();s3.t.join

24、();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)_; try FileReader fis = new_(args0);BufferedReader reader = new BufferedReader( );String s；while(s=reader.readLine

25、()!=_) 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;FileReaderfisnullArrayIndexOutOfBoundsException18、阅读以下程序：public class Sum public static void main(

26、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=1; a22=1;System.out.println("数组a：");for (int i=0; i < a.len

27、gth; 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：for(foo('A'); foo('B')

28、&& (i<2); foo('C')i+;foo('D'); 此程序的输出结果是："ABDCBDCB"21、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; p

29、rivate int x=l0,y=10,width=10,height=10; public OvalDrawer(String title)super(title);_; /设置窗口大小为300*300setVisible(true);_; /创立线程并启动 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(

30、int)(Math.random()*(colors.length-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 Threa

31、d(this).start();repaint();g.drawOval(x,y,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.*;i

32、mport java.applet.Applet;public class Applet1 extends Applet 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

33、Test public static void main(String args) int i;int a=11,22,33,44,55,66,77,88,99;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 _ App

34、let private Font afont = _Font("Helvetica",Font.BOLD,18); public void init() _(Color.black); 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 m

35、ain(String args)System.out.printf("sqrt(2.0)=%f", Math.sqrt(2.0); 此程序的输出是：sqrt(2.0)=1.41421427、阅读以下程序public class SumTest public static void main(String args) double sum = 0.0;for(int i=1; i <= args.length; i+)sum += Double.parseDouble(argsi);System.out.println("sum=" + sum);

36、此程序完成的功能是：从命令行输入假设干个数，求这假设干个数的和并输出结果。28、阅读以下程序import java.util.Scanner;class IfTest public static void main(String args)double y,x;Scanner keyin = new Scanner(System.in);System.out.print(请输入x的值：);x = keyin.nextDouble();if ( x > 0 ) y = 2 * x;else if( x = 0) y = 2 + Math.cos(x);else y = x * x + 1;

37、 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 x>0y= 2 + cos(x) x=0 x2+1 x<029、阅读以下程序，完成填空，使其完整。import _;class Rectangle public static void 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