Template Pattern

DocumentReader.java

import java.io.File;

public abstract class DocumentReader {
	
	protected String fileName;

	public DocumentReader(String fileName){
		this.fileName=fileName;
	}
	
	public String getFileName() {
		return fileName;
	}

	public void setFileName(String fileName) {
		this.fileName = fileName;
	}

	public void processFile(){
		boolean isPresent = checkforFilePresent();
		if(!isPresent)
			System.out.println("Could not find a file::"+fileName);
		openFile();
		readFile();
		closeFile();
	}
	
	public boolean checkforFilePresent(){
		System.out.println("checking if file is present::"+fileName);
		return true;
	}

	public abstract void openFile();
	public abstract void readFile();
	public void closeFile(){
		System.out.println("closing the file::"+fileName);
	}
}

PDFDocumentReader.java

public class PDFDocumentReader extends DocumentReader{

	public PDFDocumentReader(String fileName){
		super(fileName);
	}
	public void openFile(){
		System.out.println("opening the pdf file with Acrobat reader::"+fileName);
	}
	public void readFile(){
		System.out.println("reading the pdf file with Acrobat reader::"+fileName);
	}


}

WordDocumentReader.java

public class WordDocumentReader extends DocumentReader{
	public WordDocumentReader(String fileName){
		super(fileName);
	}
	
	public void openFile(){
		System.out.println("opening the word file with MS office::"+fileName);
	}
	public void readFile(){
		System.out.println("reading the word file with MS office::"+fileName);
	}

}

TemplatePatternDemo.java

public class TemplatePatternDemo {

	public static void main(String[] args) {
	 //read the ABC.PDF file
		DocumentReader reader = new PDFDocumentReader("ABC.pdf");
		reader.processFile();
		
		//read XYZ.doc file
		reader = new WordDocumentReader("XYZ.doc");
		reader.processFile();

	}

}

Output