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Easy Learn Java: Programming Articles, Examples and Tips - Page 457


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I show you now a class in Java which has no public constructor!

Go to all tips in General Java

Are you sure that know Java well? Is it possible that class in Java has no public constructor? I do not mean default constructor with no arguments, which always exists, but its declaration can be skipped if it just one default constructor there...

No I mean no public constructor at all... And if so, why it is private? How it is supposed to be used if it is private? Is not it strange? If you can not instantiate a class, how you can use it?

Answer: it is class Class which has no public constructor Smile You are not supposed to construct it.

Instead Class objects are constructed automatically by the Java Virtual Machine as classes are loaded and by calls to the defineClass method in the class loader.

The following example uses a Class object to print the class name of an object:

 


void printClassName(Object obj) {
   System.out.println("The class of " + obj +
       " is " + obj.getClass().getName());
}
 

It is also possible to get the Class object for a named type (or for void) using a class literal (JLS Section 15.8.2). For example:

System.out.println("The name of class Foo is: "+Foo.class.getName());
 
Reference: Java API

 


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Posted by Javaaddict on Thursday, May 25, 2006 (00:30:00) (4388 reads)

MobiForms Version 3.0 Released With Improved Wireless Networking and ERP Connect

Go to all tips in Java Mobile Technology
The latest release of the revolutionary Java based mobile development tool MobiForms now includes improved networking functionality. Client-server mobile applications can be built using serial, USB, Ethernet, Wi-Fi or mobile phone connections interfacing to back office corporate applications like ERP and financials.
MobiForms version 3.0's integrated MobiScript language includes file and data transfer commands using any given IP address and port combination with TCP/IP. Version 3.0 includes a new image object type for JPG and GIF file support. The MobiForms Developer has also been enhanced with the latest Windows look and feel.

This latest release complements the existing features in MobiForms such as signature capture, sophisticated MobiScript commands enabling bar coding, connectivity to Oracle, Sybase and IBM DB2 databases, or simple ASCII file access.

MobiForms is a rapid application development tool for building mobile applications for Tablet PC, Pocket PC, Windows CE, Windows Mobile, EPOC, Symbian and Palm based mobile computers and PDAs. MobiForms revolutionises the creation of mobile applications by reducing development time from days to minutes. With MobiForms you can develop professional applications for asset collection, field service, inspection, market research, site surveys, stock control or workshop repair, quickly and seamlessly using the intuitive MobiForms drag and drop interface and tie the data back easily to corporate systems.

MobiForms can be downloaded the MobiForms web site at www.mobiforms.com.
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Posted by Anonymous on Monday, May 22, 2006 (19:19:10) (2648 reads)

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