Automatic Packing solution box for new characteristics of j2se5.0

Automatic Packing solution box for new characteristics of j2se5.0

Shi smallnest@163.com



As a programmer, a Java programmer, when using map and collection, often comes back to the following situations:

Map map;

...

String name = Map.get ("name");

...

The values fetched here from the map object need to be cast to the type we need, which is often encountered when reading property values in a JSP.



Jesus, why don't you just turn me into the type I need.

Through paradigm programming and improvements to the Java language, we now automatically implement boxing and unpacking operations. Look at the following example:

Package com.kuaff.jdk5;



Import Java.util.Date;

Import Java.util.HashMap;

Import Java.util.Map;



public class Boxing

{

Private map<string,date> Map = new hashmap<string,date> ();



Public Boxing ()

{

Map.put ("Date", new Date ());

}

public void PrintDate ()

{

Date date = Map.get ("date");

System.out.printf ("Current time:%s", date);

}



public static void Main (string[] args)

{

Boxing box = new Boxing ();

Box.printdate ();

}

}


We have declared a string,date type of map, in English it should be (Map of string,date) so that we can directly box Map.put ("Date", new Date ()), and the reconciliation case date = Map.get (" Date ");

This function may not be very big, at least we can knock down a few letters, take care of our keyboard.