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1£¬½¨Ò»¸öuserdb¿â£¬ÔÙ½¨userinfo±í£¬×ֶΣºid(int),username(varchar),password(varchar)¡£
2£¬DBConnection.java
package com.datainfo;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBConnection {
public static Connection getConnection() throws ClassNotFoundException,
SQLException {
Connection conn = null;
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/userdb"; //²»Í¬Êý¾Ý¿â²»Í¬JDBC
String username = "sa";
String password = "sasa";
Class.forName(driver);
conn = DriverManager.getConnection(url, username, password);
return conn;
}
}
3£¬User.java
package com.datainfo;
public class User {
private int id;
private String username;
private String password;
public User() {
}
/**
* @return the id
*/
public int getId() {
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use namespace mx_internal
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int change(int x,int y)
{
int temp=x;
x=y;
y=temp;
}
CÓïÑÔÖеĴ«Ö·´úÂëÈçÏ£º
int change(int *p,int *q)
{
int temp=*p;
*p=*q;
*q=temp;
}
ʹÓÃC++ÖеÄÒýÓÃÀàÐÍ´úÂëÈçÏÂ:
int change(int &x,int &y)
{
int temp=x;
x=y;
y=temp;
}
JAV ......
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲçÛJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJDKÊÇSun¹«Ë¾·¢²¼µÄJDK£¬³ýÁËSunÖ®Í⣬»¹Óкܶ๫˾ºÍ×éÖ¯¶¼¿ª· ......
ÔÚJavaÀïÃæ£¬Á½¸öÕûÊýÏà³ýµÃµ½ÊǸöÕûÊý£¬±ÈÈç int a = 28;
int b = 10;
a/b == 2; //true
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var a:Number = 28 ......