java试题与答案.doc

JAVA机试题1、25分用输入/输出写一个程序，让用户输入一些姓名和电话号码。每一个姓名和号码将加在文件里。用户输入Done输入完毕。 如果用户输入完整个列表，程序将创建一个输出文件并显示或打印出来。 格式如：555-1212,Tom 123-456-7890,Peggy L. 234-5678,Marc 234-5678,Ron 876-4321,Beth&Brian 5.70,Jean-Marc package com.fendou;import java.io.*;import java.util.*;public class ConsumerTest public static void main(String args)BufferedReader br=new BufferedReader(new InputStreamReader(System.in);ArrayList al=new ArrayList();File f=new File(C:Documents and SettingsAdministrator桌面1.txt);while(true)try System.out.println(输入新用户请按1:);System.out.println(结束请输Done:);String ss=br.readLine();if(ss.equals(1)System.out.println(请输入新用户:);String num=br.readLine();al.add(num);else if(ss.equals(Done)FileWriterfw = new FileWriter(f);BufferedWriter bw=new BufferedWriter(fw);System.out.println(al);bw.write(al.toString();bw.flush();bw.close();System.exit(0); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace(); 2、 10分 * * * * * * * * * * * * * * * * * * * * * * * * *package com.fendou;public class Jingzita public static void main(String args) int i, j, k;for (i = 0; i 4; i+) for (j = 0; j 3 - i; j+) System.out.print( );for (k = 0; k = 2 * i; k+) System.out.print(*);System.out.println();for (i = 0; i 4; i+) for (j = 0; j = i; j+) System.out.print( );for (k = 0; k 5 - 2 * i; k+) System.out.print(*);System.out.println();3、1.有n个人围成一圈，顺序排号。从第一个人开始报数（从1到3循环报数），凡报到3的人退出圈子，问最后留下的是原来第几号的那位。 15分package com.fendou;public class Count public static void main(String args)boolean arr=new boolean500;for(int i=0;i1)if(arrindex=true)count+;if(count=3)count=0;arrindex=false;leftCount-;index+;if(index=arr.length)index=0;for(int i=0;iarr.length;i+)if(arri=true)System.out.println(i);4、Java上机实现统计某一目录下每个文件中出现的字母个数、数字个数、空格个数及行数？15分package com.fendou;import java.io.*;public class FileTest public static void main(String args)File f=new File(G:EmployeeManagerArrayList);String s=f.list();String s1=new Strings.length;String str;FileReader fs;try for(int i=0;is.length;i+)int a=0;int b=0;int shu=0;int index=0;System.out.println(si);fs = new FileReader(G:EmployeeManagerArrayList+si);BufferedReader bs=new BufferedReader(fs);try while(str=bs.readLine()!=null)s1i=str;index+;char c=s1i.toCharArray();for(int k=0;kc.length;k+)if(ckA)a+;else if(ck= )b+;else if(ck0)shu+;System.out.println(有+index+行);System.out.println(字母个数:+a);System.out.println(空格个数:+b);System.out.println(数字个数:+shu); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (FileNotFoundException e) / TODO Auto-generated catch blocke.printStackTrace();5、写三个类plane,car,cometime,cometime用来求速度。car的速度为A*B/C,plane的速度为A+B+C,当运行时，输入plane30 20 40可求出速度，输入car20 40可求出plane速度。10分package com.fendou;import java.io.*;class planeString name;int A,B,C;plane(String name,int A,int B,int C)=name;this.A=A;this.B=B;this.C=C;int planetime()return A+B+C;class carString name;int A,B,C;car(String name,int A,int B,int C)=name;this.A=A;this.B=B;this.C=C;int cartime()return A*B/C;public class cometime int A,B,C;public static void main(String args)plane p=new plane(plane,30,20,40);System.out.println(飞机的速度:+p.planetime();car c=new car(car,30,20,40);System.out.println(汽车的速度:+c.cartime();6、猜数字游戏（使用二分查找，）并统计（如果猜的次数=3次，提示“你好SMART”，=7次，提示“同志还续努力”） 25分package com.fendou;import java.io.*;public class ZheBan public static void main(String args)BufferedReader br=new BufferedReader(new InputStreamReader(System.in);int a=new int100;int index=1;for(int i=0;i100;i+)ai=i+1;int min=a0;int max=aa.length-1;int middle=(min+max)/2;System.out.println(请输入0-100内要查找的数字:);try int b=Integer.parseInt(br.readLine();while(middle!=b)if(middle=b)index+;else if(middleb)min=middle+1;middle=(min+max)/2;index+;elsemax=middle-1;middle=(min+max)/2;index+; catch (NumberFormatException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();if(index=3)System.out.println(你好SMART!);else if(index=7)System.out.println(同志还续努力!);7、2）假如有字符串“6sabcsssfsfs33” ，用最有快速的方法去掉字符“ab3”，不能用java内置字符串方法（indeOf,substring,replaceAll等）？package com.fendou;public class StringTest public static void main(String args)String str=new String(6sabcsssfsfs33);char c=str.toCharArray();for(int i=0;i（一千零一拾一元整）输出。package com.fendou;import java.io.*;public class Money public static void main(String args)BufferedReader br=new BufferedReader(new InputStreamReader(System.in);System.out.println(请输入人民币:);String s1=零,壹,贰,叁,肆,伍,陆,柒,捌,玖;try int money=Integer.parseInt(br.readLine();if(money10)System.out.println(s1money+元整);else if(money100)System.out.println(s1money/10+拾+s1money%10+元整);else if(money1000)System.out.println(s1money/100+佰+s1money%100/10+拾+s1money%10+元整);else if(money10000)System.out.println(s1money/1000+千+s1money%1000/100+佰+s1money%1000%100/10+拾+s1money%1000%100%10+元整); catch (NumberFormatException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();9、编程：编写一个截取字符串的函数，输入为一个字符串和字节数，输出为按字节截取的字符串。 但是要保证汉字不被截半个，如“我ABC”4，应该截为“我AB”，输入“我ABC汉DEF”，6，应该输出为“我ABC”而不是“我ABC+汉的半个”package com.fendou;import java.io.*;public class TestByte public static void main(String args) String str = new String(我ABC汉DEF);BufferedReader br=new BufferedReader(new InputStreamReader(System.in);System.out.println(请输入要截取的字节数:);try int j=Integer.parseInt(br.readLine();byte c1 = str.getBytes();ByteArrayInputStream cr = new ByteArrayInputStream(c1);byte c2 = new bytec1.length;cr.read(c2, 0, c1.length);if (c2j 0) String subStrx = new String(c2, 0, -j);System.out.println(subStrx); else String subStrex = new String(c2, 0, j);System.out.println(subStrex); catch (NumberFormatException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();10、现在输入n个数字，以逗号，分开；然后可选择升或者降序排序；，提示(StringTokenizer) package com.fendou;public class Danchi public static void main(String args) String s1 = 5,3,7,1,9;String str = s1.split(,);String ss;for (int i=0;istr.length;i+) for(int j=i;j0)ss=stri;stri=strj;strj=ss;for(String s2:str)System.out.println(s2);11、通过设计一接口，定义有关算术的属性。并创建四个应用该接口的类，分别进行加减乘除的运算。package com.fendou.jishuan;public interface Shuan void jishuanqi(int num1,int num2);package com.fendou.jishuan;public class Jia implements Shuanprivate int num1,num2;int n;Jia(int num1,int num2)this.num1=num1;this.num2=num2;public void jishuanqi(int num1,int num2)n=num1+num2;System.out.println(计算结果:+n);package com.fendou.jishuan;public class Jian implements Shuanprivate int num1,num2;int n;Jian(int num1,int num2)this.num1=num1;this.num2=num2;public void jishuanqi(int num1,int num2)n=num1-num2;System.out.println(计算结果:+n);package com.fendou.jishuan;public class Chen implements Shuanprivate int num1,num2;int n;Chen(int num1,int num2)this.num1=num1;this.num2=num2;public void jishuanqi(int num1,int num2)n=num1*num2;System.out.println(计算结果:+n);package com.fendou.jishuan;public class Chu implements Shuanprivate int num1,num2;int n;Chu(int num1,int num2)this.num1=num1;this.num2=num2;public void jishuanqi(int num1,int num2)n=num1/num2;System.out.println(计算结果:+n);package com.fendou.jishuan;import java.io.*;public class JisuanTest public static void main(String args)BufferedReader br=new BufferedReader(new InputStreamReader(System.in);try while(true)System.out.println(请输入第一个数num1:);int num1=Integer.parseInt(br.readLine();System.out.println(请输入第二个数num1:);int num2=Integer.parseInt(br.readLine();System.out.println(请输入+，-，*，/:);System.out.println(退出计数器请输0);String s=br.readLine();if(s.equals(+)Jia jia=new Jia(num1,num2);jia.jishuanqi(num1, num2);else if(s.equals(-)Jian jian=new Jian(num1,num2);jian.jishuanqi(num1, num2);else if(s.equals(*)Chen chen=new Chen(num1,num2);chen.jishuanqi(num1, num2);else if(s.equals(/)Chu chu=new Chu(num1,num2);chu.jishuanqi(num1, num2);else if(s.equals(0)System.exit(0); catch (NumberFormatException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();12、设计一个包，并在其中创建两个类，一个类将小写字母变为大写字母，另一个类将大写字母变为小写字母。然后创建一个类，实现将 “b” 变为 “B” 和将 “E” 变为 “e” 。package com.fendou;public class dk public sta