java中的关键字（transient）
transient这个关键字并不常见，主要应用在java的序列化方面。这里我再多说，转一篇老外的文章，很生动，欣赏吧
Be Careful With Transient Data
Java's serialization provides an elegant, and easy to use mechanism for making an object's state persistent. While controlling object serialization, we might have a particular object data member that we do not want the serialization mechanism to save.
To turn off serialization on a certain field of an object, we tag that field of the class of our object with the Java's "transient" keyword. This, to low-level parts of the Java virtual machine, is an indication that the transient variable is not part of the persistent state of an object.
First, let's have some backgrounder code with Java's serialization.
Suppose we define a class as:
public class LoggingInfo implements java.io.Serializable
{
private Date loggingDate = new Date();
private String uid;
private transient String pwd;
LoggingInfo(String user, String password)
{
uid = user;
pwd = password;
}
public String toString()
{
String password=null;
if(pwd == null)
{
password = "NOT SET";
}
else
{
password = pwd;
}
return "logon info: \n " + "user: " + uid +
"\n
相关文档：
将以下内容复制Eclipse中运行，随意输入一个用户名，程序会自动计算出注册码，绝对能用！！！
package sun;
import java.io.*;
public class MyEclipseGen {
private static f ......
关键字: java中jxl导出数据到excel的例子
要往xls文件里面写入数据的时候需要注意的是第一要新建一个xls文件
OutputStream os=new FileOutputStream("c:\\excel2.xls" );
再建完这个文件的时候再建立工作文件
jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(new File(os));
如果这个文件已经存在,那� ......
1.接口的定义：
interface 接口名
{ 接口体； }
注意：接口体中只能包含常量定义和方法定义� ......
将字串 String 转换成数字类型
String 转 int
1.) int i = Integer.parseInt([String]); 或 i = Integer.parseInt([String],[int radix]);
2.) int i = Integer.valueOf(my_str).intValue();
String 转 Float
Float f = Integer.valueOf(my_str).floatValue();
String 转 float
float f=new Float(my+str).floa ......
