item.java

一个学生登陆学校library

public abstract class Item {
	private String callNumber;
	private String title;
	private String returnDate;
	private String dateOfPublication;
	private String keeper=null;
	private boolean available=true;//indicate whether the item has been borrowed.
	
	public Item(String callNumber,String title,String dateOfPublication)
	{
		setCallNumber(callNumber);
		setTitle(title);
		setDateOfPublication(dateOfPublication);
		setReturnDate("01/01/1900");
	}
	public void setCallNumber(String callNumber)
	{
		this.callNumber=callNumber;
	}
	public void setTitle(String title)
	{
		this.title=title;
	}
	public void setDateOfPublication(String dateOfPublication)
	{
		this.dateOfPublication=dateOfPublication;
	}
	public void setReturnDate(String returnDate)
	{
		this.returnDate=returnDate;
	}
	public void setKeeper(String keeper)
	{
		this.keeper=keeper;
	}
	public void setAvailable()
	{
		if(available==true)
		{
			available=false;
		}
		else available=true;
	}//swift the status of item.
	public String getCallNumer()
	{
		return callNumber;
	}
	public String getTitle()
	{
		return title;
	}
	public String getDateOfPublication()
	{
		return dateOfPublication;
	}
	public String getReturnDate()
	{
		return returnDate;
	}
	public String getKeeper()
	{
		return keeper;
	}
	public boolean getAvailable()
	{
		boolean newAvailable=available;
		return newAvailable;
	}
	public void deleteKeeper()
	{
		this.keeper=null;
	}
	public void deleteReturnDate()
	{
		this.returnDate=null;
	}
}