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java基礎(chǔ)面試題（2012完整版）
141、JAVA 多線程編程。 用 JAVA 寫一個(gè)多線程程序，如寫四個(gè)線程，二個(gè)加 1，二個(gè)對(duì)一
個(gè)變量減一，輸出。
希望大家補(bǔ)上，謝謝
142、可能會(huì)讓你寫一段 Jdbc連Oracle 的程序,并實(shí)現(xiàn)數(shù)據(jù)查詢.
答:程序如下：
package hello.ant;
import java.sql.*;
public class jdbc
{
String dbUrl="jdbc:oracle:thin:@127.0.0.1:1521:orcl";
String theUser="admin";
String thepw="manager";
Connection c=null;
Statement conn;
ResultSet rs=null;
public jdbc()
{
try{
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
c = DriverManager.getConnection(dbUrl,theUser,thepw); conn=c.createStatement();
}catch(Exception e){
e.printStackTrace();
}
}
public boolean executeUpdate(String sql)
{
---------- 16 ----------
*** JAVA面試題.txt ***
try
{
conn.executeUpdate(sql);
return true;
}
catch (SQLException e)
{
e.printStackTrace();
return false;
}
}
public ResultSet executeQuery(String sql)
{
rs=null;
try
{
rs=conn.executeQuery(sql);
}
catch (SQLException e)
{
e.printStackTrace();
}
return rs;
}
public void close()
{
try
{ conn.close();
c.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
ResultSet rs;
jdbc conn = new jdbc();
rs=conn.executeQuery("select * from test");
try{
while (rs.next())
{
System.out.println(rs.getString("id"));
System.out.println(rs.getString("name"));
}
}catch(Exception e)
{
e.printStackTrace();
}
}
}
143、ORACLE 大數(shù)據(jù)量下的分頁解決方法。一般用截取 ID方法，還有是三層嵌套方法。
答:一種分頁方法
<%< b="">
int i=1;
int numpages=14;
String pages = request.getparameter("page") ;
int currentpage = 1;
currentpage=(pages==null)?(1):{Integer.parseInt(pages)}
sql = "select count(*) from tables";
ResultSet rs = DBLink.executeQuery(sql) ;
while(rs.next()) i = rs.getInt(1) ;
int intpageCount=1;
intpageCount=(i%numpages==0)?(i/numpages):(i/numpages+1);
int nextpage ;
int uppage;
nextpage = currentpage+1; if (nextpage>=intpageCount) nextpage=intpageCount;
uppage = currentpage-1;
if (uppage<=1) uppage=1;
---------- 17 ----------
*** JAVA面試題.txt ***
rs.close();
sql="select * from tables";
rs=DBLink.executeQuery(sql);
i=0;
while((i
%>
//輸出內(nèi)容
//輸出翻頁連接
合計(jì):<%=currentpage%>/<%=intpagecount%>
上一頁
<%< b="">
for(int j=1;j<=intpagecount;j++){< b="">
if(currentpage!=j){
%>
<%< b="">
}else{
out.println(j);
}
}
%>
144、用 jdom解析xml 文件時(shí)如何解決中文問題?如何解析?
答:看如下代碼,用編碼方式加以解決
package test;
import java.io.*;
public class DOMTest
{
private String inFile = "c:\\people.xml";
private String outFile = "c:\\people.xml";
public static void main(String args[])
{
new DOMTest();
}
public DOMTest()
{
try
{
javax.xml.parsers.DocumentBuilder builder =
javax.xml.parsers.DocumentBuilderFactory.newInstance().newDocumentBuilder();
org.w3c.dom.Document doc = builder.newDocument();
org.w3c.dom.Element root = doc.createElement_x("老師");
org.w3c.dom.Element wang = doc.createElement_x("王");
org.w3c.dom.Element liu = doc.createElement_x("劉");
wang.appendChild(doc.createTextNode("我是王老師"));
root.appendChild(wang);
doc.appendChild(root);
javax.xml.transform.Transformer transformer =
javax.xml.transform.TransformerFactory.newInstance().newTransformer();
transformer.setOutputproperty(javax.xml.transform.OutputKeys.ENCODING, "gb2312");
transformer.setOutputproperty(javax.xml.transform.OutputKeys.INDENT, "yes");
transformer.transform(new javax.xml.transform.dom.DOMSource(doc),
new
javax.xml.transform.stream.StreamResult(outFile));
---------- 18 ----------
*** JAVA面試題.txt ***
}
catch (Exception e)
{
System.out.println (e.getMessage());
}
}
}
145、編程用JAVA 解析 XML 的方式.
答:用 SAX方式解析XML，XML文件如下：
王小明
信息學(xué)院
6258113
男,1955 年生,博士，95 年調(diào)入海南大學(xué)
事件回調(diào)類SAXHandler.java
import java.io.*;
import java.util.Hashtable;
import org.xml.sax.*;
public class SAXHandler extends HandlerBase
{
private Hashtable table = new Hashtable(); private String currentElement = null;
private String currentValue = null;
public void setTable(Hashtable table)
{
this.table = table;
}
public Hashtable getTable()
{
return table;
}
public void startElement(String tag, AttributeList attrs)
throws SAXException
{
currentElement = tag;
}
public void characters(char[] ch, int start, int length)
throws SAXException
{
currentValue = new String(ch, start, length);
}
public void endElement(String name) throws SAXException
{
if (currentElement.equals(name))
table.put(currentElement, currentValue);
}
} JSp內(nèi)容顯示源碼,SaxXml.jsp:
剖析XML文件people.xml
<%@ page errorpage="Errpage.jsp"
contentType="text/html;charset=GB2312" %>
<%@ page="" import="java.io.*">
<%@ page="" import="java.util.Hashtable">
<%@ page="" import="org.w3c.dom.*">
<%@ page="" import="org.xml.sax.*">
<%@ page="" import="javax.xml.parsers.SAXparserFactory">
<%@ page="" import="javax.xml.parsers.SAXparser">
<%@ page="" import="SAXHandler">
<%< b="">
File file = new File("c:\\people.xml");
FileReader reader = new FileReader(file);
parser parser;
SAXparserFactory spf = SAXparserFactory.newInstance();
SAXparser sp = spf.newSAXparser();
SAXHandler handler = new SAXHandler();
sp.parse(new InputSource(reader), handler);
---------- 19 ----------
*** JAVA面試題.txt ***
Hashtable hashTable = handler.getTable();
out.println("
教師信息表");
out.println("
姓名" + "
| " + |
(String)hashTable.get(new String("name")) + "");
out.println("
學(xué)院" + "
| " + |
(String)hashTable.get(new String("college"))+"");
out.println("
電話" + "
| " + |
(String)hashTable.get(new String("telephone&
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