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JavaÖм¶¿ª·¢¹¤³Ìʦ±ÊÊÔÊÔ¾í(Ò»)
2014-11-24 01:40:39 ¡¾´ó ÖРС¡¿ ä¯ÀÀ:463´Î
Tags£ºJava Öм¶ ¿ª·¢ ¹¤³Ìʦ ±ÊÊÔ ÊÔ¾í

Ò»¡¢Ð´³öjava´¦ÀíÒì³£µÄ»ù±¾Óï·¨¸ñʽ


try{ }catch(exception e){ }finally{};


¶þ¡¢Ð´³ö¶Á³öÏà¶Ô·¾¶¡±\deppon\depponIT.txt¡±ÎļþµÄÁ÷£¬ÔÚ±ØÒªµÄµØ·½×ö²¶»ñÒì³£µÄ´¦Àí


fileInputStream fis;


Public void readTXT(){


Try{


Fis= new FileInputStream(¡°\deppon\depponIT.txt¡±);


}catch(IOException e){


/Òì³£´¦Àí


}


}


Èý¡¢Ð´³ÌÐò½¨Á¢map¼¯ºÏ£¬²¢ÔÚmapÖн¨Á¢IT²¿£¬±à¼­²¿£¬ÈËÁ¦×ÊÔ´²¿ÓëµÂ°îÎïÁ÷µÄ¶ÔÓ¦¹Øϵ¡£²¢Ð´³öÅжÏÓï¾ä£¬Èç¹ûmapÖаüº¬IT²¿£¬ÔòÊä³ö×Ö·û´®¡°good department¡±¡£


´ð°¸


Map map= new Map();


map.put(¡°ÈËÁ¦×ÊÔ´²¿¡±£¬¡°µÂ°îÎïÁ÷¡±)£»


map.put(¡°IT²¿¡±£¬¡°µÂ°îÎïÁ÷¡±)£»


map.put(¡°±à¼­²¿¡±£¬¡°µÂ°îÎïÁ÷¡±)£»


if£¨map.contans£¨¡°IT²¿¡±£©£©{


system.out.print(¡°good department¡±)£»


}


ËÄ¡¢ÓÐÒ»¸öclass A £¬ËüÓÐÒ»¸öĬÈϵĹ¹Ôì·½·¨£¬Çëдһ¶Ë´úÂëʵÏÖ A µÄ¶¯Ì¬¼ÓÔØ£¿£¨4·Ö£©


¿ÉÒÔÀûÓ÷´ÉäʵÏÖÀàµÄ¶¯Ì¬¼ÓÔØ:


ÒòΪÀàAµÄ¹¹ÔìÆ÷ÊÇÎ޲εÄ,ËùÒÔʵÏÖAµÄ¶¯Ì¬µÄ¼ÓÔصĴúÂëÈçÏÂ:


public class B{


public static void main(String[] args){


try{


A a = (A)Class.forName(¡°A¡±).newInstance();


}catch(Exception e){


e.printStackTrace();


}


}


}


Îå¡¢Çëдһ¸ö£¨µ¥Àý£©SingletonµÄÀý×Ó£¬ÓÐЧ´úÂë²»µÃ³¬¹ý10ÐС££¨5·Ö£©


class Husband{


private static Husband instance=new Husband();


public static Husband newInstance(){


return instance;


}


private Husband(){}


}


Áù ·¢ÆË¿ËÅÆ£ºÓÐ52ÕÅÆË¿ËÅÆ£¨´Ó1µ½52£©£¬ÒªËæ»ú·Ö·¢µ½Êý×éCard[52]ÖУ¬Çëдһ¶Î³ÌÐò


±í´ï¡££¨6·Ö£©


import java.util.*;


public class E{


public static void main(String[] args){


int Card[] = new int[52];


boolean ishave = true;


Set s = new HashSet();


for(int j = 0;j<52;j++){


Integer in = new Integer(j);


s.add(in);


}


int k = 0;


while(ishave){


if(!s.isEmpty()){


int ra = Math.round((float)Math.random()*100);


Integer rai = new Integer(ra);


if(s.contains(rai)){


s.remove(rai);


Card[k] = ra;


k++;


}


}else{ishave = false;}


}


for(int m =0;m<52;m++){


System.out.println(Card[m]);


}


}


}


Æß¡¢ ÇëÍê³É³ÌÐò,²éѯtable1±íÖÐfield1×ֶεÄÖµÊÇ1µÄ¼Í¼,²¢½«²éѯ½á¹û¶¨Î»µ½²éѯ½á¹ûÖеĵÚÈýÐв¢´òÓ¡µÚÈýÐеÄvcFieldµÄÖµ,field1×Ö¶ÎÀàÐÍÊÇnumber£¨ÓÃjava´úÂëʵÏÖ£©¡£ £¨5£©


Connection con = ¡­ ;
String sql = ¡±select vcField from table1 where field1 = ¡±;
Connection con = null;
String sql = ¡±select vcField from table1 where field1 = ¡±;
PreparedStatement ps = con.prepareStatement(sql);
ps.setInt(1,1);
ResultSet rs = ps.executeQuery();
rs.next();
rs.next();
rs.next();
String vcField = rs.getString(¡°vcField¡±);
System.out.println(vcField);


°Ë¡¢¿½±´c:\temp.txtÎļþΪc:\temp2.txtÎļþ
import java.io.*;
public class FileCopyTest {
public static void main(String[] args) {
try{
FileReader fr = new FileReader(¡°c:\\temp.txt¡±);
BufferedReader br = new BufferedReader(fr);
FileWriter fw = new FileWriter(¡°c:\\temp2.txt¡±);
PrintWriter pw = new PrintWriter(fw,true);
String line ;
while ((line = br.readLine()) != null){
pw.println(line);
}
}catch(Exception e) {e.printStackTrace();}
}
}
¾Å.ÇëÍê³É³ÌÐò,²éѯtable1±íÖÐfield1×ֶεÄÖµÊÇ1µÄ¼Í¼,²¢½«²éѯ½á¹û¶¨Î»µ½²éѯ½á¹ûÖеÄ
µÚÈýÐв¢´òÓ¡µÚÈýÐеÄvcFieldµÄÖµ,field1×Ö¶ÎÀàÐÍÊÇnumber.
Connection con = ¡­ ;
String sql = ¡±select vcField from table1 where field1 = ¡±;
Connection con = null;
String sql = ¡±select vcField from table1 where field1 = ¡±;
PreparedStatement ps = con.prepareStatement(sql);
ps.setInt(1,1);
ResultSet rs = ps.executeQuery();
rs.next();
rs.next();
rs.next();
String vcField = rs.getString(¡°vcField¡±);
System.out.println(vcField);


Ê®¡¢ÄÚ²¿ÀàµÄʵÏÖ·½Ê½


ʾÀý´úÂëÈçÏ£º
package test;
public class OuterClass
{
private class InterClass
{
public InterClass()
{
System.out.println(¡°InterClass Create¡±);
}
}
public OuterClass()
{
InterClass ic = new InterClass();
System.out.println(¡°OuterClass Create¡±);
}
public static void main(String[] args)
{
OuterClass oc = new OuterClass();
}
}
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