It’s possible to create the Object for the interface?

It’s possible to create the Object for the interface?

When working with smartcard project, I have come across the requirement to filter the only .doc file from a directory in a file array.

For that I have used the following classes and interfaces are:

1. File-Class

2. FileFilter-Interface.

I have created the Object for the FileFilter interface as below.

static FileFilter fileFilter=new FileFilter() {

public boolean accept(File pathname) {

System.out.println("with in accept");

String filename=pathname.getName();

if(filename.endsWith(".doc"))

{

return Boolean.TRUE;

}

return Boolean.FALSE;

// throw new UnsupportedOperationException("Not supported yet.");

}

};

Passed the file filter instance to the listFiles method of File class to get the only .doc file array.

as below.

File directory=new File("C:/Documents and Settings/Marimuthu/Desktop/download");

File[] filearray=directory.listFiles(fileFilter);

for(File docfile:filearray)

{

System.out.println("docfilename="+docfile.getName());

}

So finally I got the only File array that contains only doc files.

Code for File Filter:

public class SampleFileFilter{

static FileFilter fileFilter=new FileFilter() {

public boolean accept(File pathname) {

System.out.println("with in accept");

String filename=pathname.getName();

if(filename.endsWith(".doc"))

{

return Boolean.TRUE;

}

return Boolean.FALSE;

// throw new UnsupportedOperationException("Not supported yet.");

}

};

public static void main(String arg[])

{

File directory=new File("C:/Documents and Settings/Marimuthu/Desktop/download");

File[] filearray=directory.listFiles(fileFilter);

for(File docfile:filearray)

{

System.out.println("docfilename="+docfile.getName());

}

}

}

But it’s can’t be understandable by Beginners so I have created separate sample interface object.

Sample for Begineer:

Code for Interface:

package com.blogspot.microtechinfo.java.exploration;

/**

*

* @author Marimuthu

*/

public interface SampleInterface {

public void createObject();

}

Code for Class:

package com.blogspot.microtechinfo.java.exploration;

/**

*

* @author Marimuthu

*/

public class SampleClass {

/*Create Reference for the SampleInterface

*

*/

static SampleInterface sampleInterface=new SampleInterface() {

/////////Implementation of the createObject method.

public void createObject() {

System.out.println("Ya! Ya! Its possible to create Object for Interface");

//throw new UnsupportedOperationException("Not supported yet.");

}

};

public static void main(String arg[])

{

//////////Use the smapleInterface reference to call the create object method

sampleInterface.createObject();

}

}

Conclusion:

Finally we can create the object for the interface also.

Thanks & Regards,

Marimuthu Rajagopal