Thread: not sure how to pass this value

im making a program a class file with two method a check in and a checkout method. the program calls for this: the balance on your account is 0 then you check out 10 books and then check in 6 the balance should be printed after each situation. after my object i made goes through the checked out method how do i take that number and use it as the balance for the next method? Im stuck!! heres my code:

public class LibraryAccount {
 
 
	private int bookBal;
	  private int bookIn;// books checked in variable
	   private int bookOut;// books checked out variable
 
 
	    // constructor
	    public LibraryAccount(int bookBal, int bookIn, int bookOut) {
	    	this.bookBal=bookBal;
	    	this.bookIn=bookIn;
	    	this.bookOut=bookOut;
 
	    }
	 // Get bookBal
	    public int getBookBal(){
	       return bookBal;
 
	    }
 
	    // Set bookBal
	    public void setBookBal(int tempBookBal){
	      bookBal = tempBookBal;
 
	       }    	    
 
 
	 // Get bookIn 
	    public int getBookIn(){
	       return bookIn;
 
	    }
 
	    // Set bookIn
	    public void setBookIn(int tempBookIn){
	      bookIn = tempBookIn;
 
	       }    	    
	 // Get bookOut
	    public int getBookOut(){
	       return bookOut;
 
	    }
	 // Set bookOut
	    public void setBookOut(int tempBookOut){
	       bookOut = tempBookOut;
 
	    }
	    public int checkIn(){
	    int	yourBal=this.bookBal+this.bookIn;
 
	    	return yourBal;
}
 
	    public int checkOut(){
	    	int yourBal2=bookBal-bookOut;
 
	    	return yourBal2;
}}

main class:

 
public class LibraryAccountDemo {
 
 
	public static void main(String[] args) {
		int bookBal=0;
		 int bookIn=6;// books checked in variable
		 int bookOut=10;// books checked out variable
 
		LibraryAccount myAccount = new LibraryAccount(bookBal,bookIn, bookOut);
		System.out.println("Your initially have a balance of " + bookBal);
		System.out.println("After checking out "+ bookOut+ " books you have "  + myAccount.checkOut());
		System.out.println("After checking in "+ bookIn+ " books you have "  + (myAccount.checkOut()+myAccount.checkIn()));
 
	}
 
}

Instead of passing values, in your checkout method you could set your balance to the desired number during the checkout rather than having to pass around variables.

found it! i think this is right

 
public class LibraryAccount {
 
 
	private int bookBal;
	  private int bookIn;// books checked in variable
	   private int bookOut;// books checked out variable
 
 
	    // constructor
	    public LibraryAccount(int bookBal, int bookIn, int bookOut) {
	    	this.bookBal=bookBal;
	    	this.bookIn=bookIn;
	    	this.bookOut=bookOut;
 
	    }
	 // Get bookBal
	    public int getBookBal(){
	       return bookBal;
 
	    }
 
	    // Set bookBal
	    public void setBookBal(int tempBookBal){
	      bookBal = tempBookBal;
 
	       }    	    
 
 
	 // Get bookIn 
	    public int getBookIn(){
	       return bookIn;
 
	    }
 
	    // Set bookIn
	    public void setBookIn(int tempBookIn){
	      bookIn = tempBookIn;
 
	       }    	    
	 // Get bookOut
	    public int getBookOut(){
	       return bookOut;
 
	    }
	 // Set bookOut
	    public void setBookOut(int tempBookOut){
	       bookOut = tempBookOut;
 
	    }
	    public int checkIn(int passBal){
	    	int newBal=passBal;
	    int	yourBal=newBal+this.bookIn;
 
	    	return yourBal;
}
 
	    public int checkOut(){
 
	    	int yourBal=bookBal-bookOut;
 
	    	return yourBal;
}}

 
public class LibraryAccountDemo {
 
 
	public static void main(String[] args) {
		int bookBal=0;
		 int bookIn=6;// books checked in variable
		 int bookOut=10;// books checked out variable
 
		LibraryAccount myAccount = new LibraryAccount(bookBal,bookIn, bookOut);
		int checkOut=myAccount.checkOut();
		int checkIn=myAccount.checkIn(checkOut);
		System.out.println("Your initially have a balance of " + bookBal);
		System.out.println("After checking out "+ bookOut+ " books you have "  + checkOut);
		System.out.println("After checking in "+ bookIn+ " books you have "  + checkIn);
 
	}
 
}

i added a parameter to the check in method and called that that method using the variable i assigned to the value of the first method. i think this is correct. Any thoughts?

int booksInPosession = 0;

public void checkOut() { booksInPosession++; }

public void checkIn() { booksInPosession--; }

In this way booksInPosession will keep the number of books currently checked out