Java 学习笔记及资源

Spring框架入门HelloWorld :http://www.importnew.com/13246.html  (iteye 唐 博客，跟我学Sprint）

Spring 框架下载地址：http://repo.spring.io/release/org/springframework/spring/

Class.forName方法，此方法含义是：加载参数指定的类，并且初始化它。

        // TODO Auto-generated method stub
        //声明connection 对象
        Connection con;
        //驱动程序名
        String driver = "com.mysql.jdbc.Driver";
        //URL指向要访问的数据库名
        String url  = "jdbc:mysql://localhost:3306/sqltestdb";
        String user = "root";
        String password = "123456";
        try {
            //加载驱动程序
            Class.forName((driver));
            //1 .getConnection()方法连接MYSQL数据库；
            con = DriverManager.getConnection(url,user,password);

 

抽象类：抽象类不能实例化对象，类的其它功能仍然存在。抽象类只能被继承，才能被使用。在java中使用abstract 业定义抽象类；

/* 文件名 : Employee.java */
public abstract class Employee
{
   private String name;
   private String address;
   private int number;
   public Employee(String name, String address, int number)
   {
      System.out.println("Constructing an Employee");
      this.name = name;
      this.address = address;
      this.number = number;
   }
   public double computePay()
   {
     System.out.println("Inside Employee computePay");
     return 0.0;
   }
   public void mailCheck()
   {
      System.out.println("Mailing a check to " + this.name
       + " " + this.address);
   }
}