语言程序设计资料：Java开发必备自测练习题

1、开发必备测试题集说明：（1）“”表示是初级题；（2）“”表示是中级题；（3）“”表示是高级题。目录开发必备测试题集1一、JAVA上机测试题3题1.类模块动态加载（）3题2.自定义对象比较（）3题3.自定义对象序列化（）4题4.Java重载（）4题5.单实例类（）5题6.正则表达式（）6题7.数据输出（）6题8.URL调用（）6题9.HttpURLConnection操作（）7题10.数据类型转换（）9题11.字符集转换（）11题12.字符串截取（）12题13.写一个方法实现字符串左对齐（）13题14.Byte转字符串（）13题15.递归算法（）14题16.写文件操作（）14题17.文件内容复制

2、（）16题18.采用NIO方式实现文件copy（）17题19.Excel操作（）18题20.排序操作（）24题21.用JAVA实现插入法排序（）25题22.金额转换（）26题23.XML解析（）30题24.SOCKET编程（）32题25.SOCKET编程（）34题26.SOCKET编程（）39题27.JDBC操作（）41题28.数据库操作（）43题29.数据库存储过程调用（）54题30.解压缩操作（）56题31.计算矩形面积（）57题32.时间处理（）58题33.配置文件操作（）60题34.ArrayList操作（）61题35.目录操作1：目录建立（）62题36.目录操作2：目录检查与删除（）

3、62题37.目录操作3：目录重命名（）63题38.目录操作4：目录遍历（）63题39.接口实现（）64题40.JAVA中实现获得本机IP地址和名称（）68二、Jsp上机测试题69题41.字符串处理（）69题42.字符串处理（）69三、Struts上机测试题70题43.Action操作（）70四、Hibernate上机测试题75题44.Hibernate基本操作（）75五、Oracle上机测试题87题45.Sql语句编写（）87题46.Sql语句编写（）87题47.Sql语句编写（）87题48.Sql语句编写（/）87题49.Sql语句编写（）88题50.Sql语句编写（）88题51.外连接查询

4、（）89题52.替换空值（）89六、Javascript上机测试题89题53.去掉字符串的前后空白字符（/）89题54.判断输入字符串是否是纯数字（）90题55.验证是否为有效日期格式(yyyy-MM-dd)（）90题56.日期加减（）91题57.动态生成超链接（）92题58.显示当前时间（）92题59.限制文本框的输入（）93题60.解析XML并生成表格（）93题61.助记码输入框的实现（）95题62.单击按钮，checkbox全选中（）96题63.表格行调换（）97题64.动态样式变化（）98题65.Select对象操作（）100题66.手机号码有效性验证（）101七、HTML+CSS上机

5、测试题103题67.静态页面编写（）103一、 JAVA上机测试题题1. 类模块动态加载（）请写出两种加载类模块“com.cplatform.test”并实例化对象的方法？类模块路径：d:/test/lib/test.jar答案：方法1：Class c = Class.forName(com.cplatform.test); Test object = (Test)c.newInstance();方法2：URL url = new URL(file:/d:/test/lib/); URLClassLoader urlCL = new URLClassLoader(new URLurl); Cl

6、ass c = urlCL.loadClass(com.cplatform.test); Test object = (Test)c.newInstance();题2. 自定义对象比较（）自定义对象Test2public class Test2 public String s;public int n;public Test2()请写出如何比较两个Test2对象是否相等？答案：public class Test2 public String s;public int n;public Test2(String s1,int n1)s=s1;n=n1public int hashCode()re

7、turn s.hashCode();public boolean equals(Object obj)return (this.s.equals(Test2)obj).s) &this.n = (Test2)obj).n);Test2 t1 = new Test2(“test”,1);Test2 t2 = new Test2(“test”,1);Test2 t3 = new Test2(“test2”,1);System.out.println(“t1 equals t2 is：” + t1. equals(t2);System.out.println(“t1 equals t3 is：” +

8、 t1. equals(t3);System.out.println(“t3 equals t2 is：” + t3. equals(t2);题3. 自定义对象序列化（）自定义对象Test2public class Test2 public String s;public int n;public Test2()请写出如何序列化读写Test2对象的方法？答案：public class Test2 implements Serializablepublic String s;public int n;public Test2(String s1,int n1)s = s1;n = n1;Test

9、2 t = new Test2(test,1);FileOutputStream fos = new FileOutputStream(c:tempt.txt);ObjectOutputStream oos = new ObjectOutputStream(fos);oos.writeObject(t);oos.close();FileInputStream fis = new FileInputStream(c:tempt.txt);ObjectInputStream ois = new ObjectInputStream(fis);Test2 tt = (Test2) ois.readOb

10、ject();ois.close();题4. Java重载（）设计Application字符界面程序，定义三个重载方法mol并调用。三个方法分别为：接收一个int参数，执行平方运算并输出结果；接收两个int参数，执行相乘运算并输出结果；接收一个字符串参数，输出该字符串参数信息。要求在main( )方法中分别用参数区别调用这三个方法。如调用格式为： mol(128); mol(12,8); mol(“teacher”); 则可输出：128的平方等于16384 12*8=96 Hello,teacher!答案：public class Test public int mol(int i) retu

11、rn i*i; public int mol(int i,int j) return i*j; public void mol(String str) System.out.println(Hello,+str+!); public static void main(String args) Test t=new Test(); System.out.println(128的平方等于+t.mol(128); System.out.println(12*8=+t.mol(12,8); t.mol(teacher); 题5. 单实例类（）请写出一个简单的单实例类答案：public class Bl

12、ackListprivate static BlackList instance = null;public static synchronized BlackList getInstance()if (instance = null)instance = new BlackList();return instance;private BlackList()题6. 正则表达式（）请写出输入条件为：1012位的数字或字母的正则表达式答案：a-z0-9A-Z 10,12或 a-z0-9A-Z 10,12$题7. 数据输出（）指定变量b=50为字节类型，变量f=0.55F为单精度实型，将这两个变量打

13、印输出。答案：import java.io.*;public class Assignpublic static void main(String args) int b=50; float f=0.55F;System.out.println(b=+b);System.out.println(f=+f);题8. URL调用（）写出一个HTTP POST调用的方法，输入参数（URL,POST请求的内容,超时时间），返回，HTTP RESP的内容。答案：public static String getHttpResp(String url,String sParam,String timeOut

14、) throws IOException URL urlServer; String result=null; try if(sParam!=null & sParam.equals() url=url+sParam; urlServer=new URL(url); System.out.println(url) ; HttpURLConnection urlConn=(HttpURLConnection)urlServer.openConnection(); urlConn.setDoOutput(true); urlConn.setDoInput(true); urlConn.setReq

15、uestMethod(GET); urlConn.setUseCaches(true); result=urlConn. getResponseMessage (); catch(IOException ex) ex.printStackTrace(); throw ex; catch(Exception ex) ex.printStackTrace(); Log.printError(ex,Tools.getHttpResp(),Param.errorFile); return result; 题9. HttpURLConnection操作（）使用HttpURLConnection实现将WE

16、B站点上的图片下载到本地，假设图片URL为：1/xglloa/image/img01.jpg答案：import .*;import java.util.*;import java.io.*;public class urlConnHttpURLConnection hcon = null;public urlConn()public void openConn()tryhcon = (HttpURLConnection) new URL(1/xglloa/image/img01.jpg).openConne

17、ction();hcon.connect(); catch (Exception e)e.printStackTrace();public void down()tryBufferedInputStream in = new BufferedInputStream(hcon.getInputStream();BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(d:test.jpg);byte b = new byte1024 * 4;int i = in.read(b, 0, b.length);wh

18、ile (i != -1)out.write(b, 0, i);out.flush();i = in.read(b, 0, b.length);out.close();in.close(); catch (Exception e)e.printStackTrace();System.out.println(e.getMessage();OutputStream out = null;InputStream in = null;public static void main(String args)urlConn t = new urlConn();t.openConn();t.down();题

19、10. 数据类型转换（）实现以下几种类型转换方法：byte转int，byte转long，int转byte，long转byte，byte转16进制答案：public class NumericOper private static String HexCode = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f ; private NumericOper() public static String byteToHexString(byte b) int n = b; if(n 0) n = 256 + n; int d1 = n / 16; int

20、 d2 = n % 16; return HexCoded1.concat(HexCoded2); public static String byteArrayToHexString(byte b) String result = ; for(int i = 0; i b.length; i+) result = result.concat(byteToHexString(bi); return result; public static int byte2int(byte b, int offset) return boffset + 3 & 0xff | (boffset + 2 & 0x

21、ff) 8 | (boffset + 1 & 0xff) 16 | (boffset & 0xff) 24; public static int byte2int(byte b) return b3 & 0xff | (b2 & 0xff) 8 | (b1 & 0xff) 16 | (b0 & 0xff) 24; public static long byte2long(byte b) return (long)b7 & (long)255 | (long)b6 & (long)255) 8 | (long)b5 & (long)255) 16 | (long)b4 & (long)255)

22、24 | (long)b3 & (long)255) 32 | (long)b2 & (long)255) 40 | (long)b1 & (long)255) 48 | (long)b0 56; public static long byte2long(byte b, int offset) return (long)boffset + 7 & (long)255 | (long)boffset + 6 & (long)255) 8 | (long)boffset + 5 & (long)255) 16 | (long)boffset + 4 & (long)255) 24 | (long)

23、boffset + 3 & (long)255) 32 | (long)boffset + 2 & (long)255) 40 | (long)boffset + 1 & (long)255) 48 | (long)boffset 24); b1 = (byte)(n 16); b2 = (byte)(n 8); b3 = (byte)n; return b; /* *n 为待转数据，buf为转换后的数据，offset为buf中转换的起始点 * 转换后数据从低到高位 */ public static void int2byte(int n, byte buf, int offset) bufo

24、ffset = (byte)(n 24); bufoffset + 1 = (byte)(n 16); bufoffset + 2 = (byte)(n 8); bufoffset + 3 = (byte)n; public static byte short2byte(int n) byte b = new byte2; b0 = (byte)(n 8); b1 = (byte)n; return b; public static void short2byte(int n, byte buf, int offset) bufoffset = (byte)(n 8); bufoffset +

25、 1 = (byte)n; public static byte long2byte(long n) byte b = new byte8; b0 = (byte)(int)(n 56); b1 = (byte)(int)(n 48); b2 = (byte)(int)(n 40); b3 = (byte)(int)(n 32); b4 = (byte)(int)(n 24); b5 = (byte)(int)(n 16); b6 = (byte)(int)(n 8); b7 = (byte)(int)n; return b; public static void long2byte(long

26、 n, byte buf, int offset) bufoffset = (byte)(int)(n 56); bufoffset + 1 = (byte)(int)(n 48); bufoffset + 2 = (byte)(int)(n 40); bufoffset + 3 = (byte)(int)(n 32); bufoffset + 4 = (byte)(int)(n 24); bufoffset + 5 = (byte)(int)(n 16); bufoffset + 6 = (byte)(int)(n 8); bufoffset + 7 = (byte)(int)n; 题11.

27、 字符集转换（）请写出字符串在gb18030和ISO-8859-1之间转换的方法？答案：/ ISO-8859-1转换成gb18030new String(string1.getBytes(iso-8859-1), gb18030);/ gb18030转换成ISO-8859-1new String(string2.getBytes(gb18030), iso-8859-1);题12. 字符串截取（）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ABC4，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

28、半个。答案：package test; class SplitString String SplitStr; int SplitByte; public SplitString(String str,int bytes) SplitStr=str; SplitByte=bytes; System.out.println(The String is:+SplitStr+;SplitBytes=+SplitByte); public void SplitIt() int loopCount; loopCount=(SplitStr.length()%SplitByte=0)?(SplitStr.l

29、ength()/SplitByte):(SplitStr.length()/SplitByte+1); System.out.println(Will Split into +loopCount); for (int i=1;i=loopCount ;i+ ) if (i=loopCount) System.out.println(SplitStr.substring(i-1)*SplitByte,SplitStr.length(); else System.out.println(SplitStr.substring(i-1)*SplitByte,(i*SplitByte); public

30、static void main(String args) SplitString ss = new SplitString(test中dd文dsaf中男大343n中国43中国人0ewlfls=103,4); ss.SplitIt(); 题13. 写一个方法实现字符串左对齐（）答案：public class StringUtilpublic static String lpad(String oldStr, String padChar, int length)StringBuffer str = new StringBuffer();str.append(padding(oldStr, pa

31、dChar, length);str.append(oldStr);return str.toString();public static String rpad(String oldStr, String padChar, int length)StringBuffer str = new StringBuffer();str.append(oldStr);str.append(padding(oldStr, padChar, length);return str.toString();private static String padding(String oldStr, String p

32、adChar, int length)StringBuffer str = new StringBuffer();for (int i = 0; i length - oldStr.length(); i+)str.append(padChar);return str.toString();题14. Byte转字符串（）请实现将一个字节数组转换成字符串数组，如：0xA3,0xB4,0x01,0x34 转换成字符串“A3B40134”答案：private static String HexCode= 0,1,2,3,4,5,6,7,8,9, a,b,c,d,e,f;public static S

33、tring byteToHexString(byte b) int n = b; if(n 0) n = 256 + n; int d1 = n / 16; int d2 = n % 16; return HexCoded1 + HexCoded2;public static String byteArrayToHexString(byte b) String result = ; for(int i=0;i1时，F(n) = n * F(n-1)请用递归算法实现当n=100时候F(n)的值答案：System.out.println(F(100) = + func(100);public st

34、atic int func(int x) if (x 1) return (func(x - 1) * x; else return 1; 题16. 写文件操作（）请写出向文件中写入内容的方法。答案：private static void printToFile(String msg,String fileName,boolean flag) /打印到文件中 BufferedWriter mBufWriter=null; try if(!createFile(fileName) return; FileWriter fileWriter=new FileWriter(fileName,flag

35、); mBufWriter=new BufferedWriter(fileWriter); mBufWriter.write(msg); mBufWriter.newLine(); mBufWriter.flush(); mBufWriter.close(); catch(Throwable e) try mBufWriter.close(); catch(Throwable t) ; return; public static boolean createFile(String fileName) throws IOException,Exception File file=new File

36、(fileName); if(file.exists() /* does file exist? If so, can it be written to */ if(file.canWrite()=false) return false; else String path=null; /* Does not exist. Create the directories */ int firstSlash=fileName.indexOf(File.separatorChar); int finalSlash=fileName.lastIndexOf(File.separatorChar); if

37、(finalSlash=0) /* error, not valid path */ else if(finalSlash=1) /* UNIX root dir */ path=File.separator; else if(firstSlash=finalSlash) /* for example c: Then make sure slash is part of path */ path=fileName.substring(0,finalSlash+1); else path=fileName.substring(0,finalSlash); File dir=new File(pa

38、th); dir.mkdirs(); return true; 题17. 文件内容复制（）编写程序，完成文件复制功能，即将a.txt文件内容复制到b.txt文件中去。答案如下：import java.io.*; /*描述：将a.txt文件内容复制到b.txt文件中去。*/public class copyfile public static void main(String args) String oldPath=c:testa.txt; String newPath=c:testb.txt; try int bytesum = 0; int byteread = 0; File oldfi

39、le = new File(oldPath); /判断文件存是否存在-存在if (oldfile.exists() /读入a文件 InputStream inStream = new FileInputStream(oldPath); /读入b文件 FileOutputStream fs = new FileOutputStream(newPath); byte buffer = new byte1444; int length; while ( (byteread = inStream.read(buffer) != -1) /字节数 文件大小bytesum += byteread; /输出

40、到控制台System.out.println(bytesum); /写入文件fs.write(buffer, 0, byteread); /关闭文件流inStream.close(); catch (Exception e) System.out.println(复制单个文件操作出错); e.printStackTrace(); 题18. 采用NIO方式实现文件copy（）答案：import java.io.*;import java.nio.*;import java.nio.channels.*;public class CopyFile public void copy (String

41、src,String dest) tryFileChannel fin = new FileInputStream(src).getChannel();FileChannel fout = new FileOutputStream(dest).getChannel();ByteBuffer buf = ByteBuffer.allocate(1024);long t = System.currentTimeMillis();System.out.println(t);while(fin.read(buf) != -1) buf.flip();fout.write(buf);buf.clear(

42、);System.out.println(System.currentTimeMillis()-t);catch (Exception e)public static void main(String args) new CopyFile().copy(args0, args1);题19. Excel操作（）写一个Excel类，实现excel文件的读取和写入答案：import java.util.*;import java.io.*;import jxl.*;import jxl.write.*;/* * 提供了简单的的Excel读取和写入的方法 * Title: * Description:

43、 * Copyright: Copyright (c) 2004 * Company: * author * version 1.0 */public class Excel int sheetCount = 1; /excel工作簿，默认为1 WritableWorkbook wwb = null; /构建Workbook对象,只读Workbook对象 Vector vSheet = null; /* * 无参构造函数，生成默认名字的excel文件 */ public Excel() this(noName.excel); /* * 带有一个String类型参数的构造函数 * param fileName String 将要生成的excel文件名 */ public Excel(String fileName) try wwb = Workbook.createWorkbook(new File(fileName); vSheet = new Vector(5); catch (Exception e) /* * 带有一个File类