Single Responsibility Principal - Good sample code

BookNew.java

package sample.design.single.responsibility.good;

/**
 * 
 * Distibution under GNU GENERAL PUBLIC LICENSE Version 2, June 1991
 * 
 * @author dmalalan
 * @created Apr 11, 2016 11:20:19 AM
 * 
 * @blog https://malalanayake.wordpress.com/
 */
public class BookNew implements ReadingMaterial {

	private static final String BOOK = "Book";
	private int bookId;
	private String name;

	public int getId() {
		return bookId;
	}

	public void setBookId(int bookId) {
		this.bookId = bookId;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getType() {
		return BOOK;
	}

}

Magazine.java

package sample.design.single.responsibility.good;

/**
 * 
 * Distibution under GNU GENERAL PUBLIC LICENSE Version 2, June 1991
 * 
 * @author dmalalan
 * @created Apr 11, 2016 12:25:33 PM
 * 
 * @blog https://malalanayake.wordpress.com/
 */
public class Magazine implements ReadingMaterial {

	private static final String MAGAZINE = "Magazine";
	private int magazineId;

	public void setMagazineId(int magazineId) {
		this.magazineId = magazineId;
	}

	public int getId() {
		return magazineId;
	}

	public String getType() {
		return MAGAZINE;
	}

}

ReadingMaterial.java

package sample.design.single.responsibility.good;

/**
 * 
 * Distibution under GNU GENERAL PUBLIC LICENSE Version 2, June 1991
 * 
 * @author dmalalan
 * @created Apr 11, 2016 12:16:01 PM
 * 
 * @blog https://malalanayake.wordpress.com/
 */
public interface ReadingMaterial {
	public int getId();

	public String getType();
}

ReadingMaterialDAO.java

package sample.design.single.responsibility.good;

/**
 * 
 * Distibution under GNU GENERAL PUBLIC LICENSE Version 2, June 1991
 * 
 * @author dmalalan
 * @created Apr 11, 2016 11:35:44 AM
 * 
 * @blog https://malalanayake.wordpress.com/
 */
public class ReadingMaterialDAO {

	/**
	 * 1. Get DB connection and 2. Create transaction 3. Save the RM 4. Commit
	 * transaction
	 */
	public void saveRM(ReadingMaterial readingMaterial) {

		System.out.println("[SAVE:RM " + readingMaterial.getId() + "]");
	}

	/**
	 * 1. Get DB connection and 2. Create transaction 3. Update the RM 4.
	 * Commit transaction
	 */
	public void updateRM(ReadingMaterial readingMaterial) {

		System.out.println("[UPDATE:RM " + readingMaterial.getId() + "]");
	}

	/**
	 * 1. Get DB connection and 2. read the RM
	 * 
	 */
	public void readRM(ReadingMaterial readingMaterial) {

		System.out.println("[READ:RM " + readingMaterial.getId() + "]");
	}

	/**
	 * 1. Get DB connection and 2. Create transaction 3. Delete the RM 4.
	 * Commit transaction
	 */
	public void deleteRM(ReadingMaterial readingMaterial) {

		System.out.println("[DELETE:RM " + readingMaterial.getId() + "]");
	}

}