Help Writing a certain method

[hannahs]

I'll try to explain this the best I can.

I have a class called book which creates books that each hold information such as author, title, ISBN code, etc.

Then I have another class called booklist which stores the books in an array list.

In the booklist class I am trying to write a method which displays the books only written by a specific author.

In my book class I have these methods that will help with the method I am creating:

public void addAuthor(String f, String l)
{
author = f + " " + l;
}

public String getAuthor()
{
return author;
}

public void display()
{

System.out.println("Title:\t" + title);
System.out.println("Author:\t" + author);
System.out.println("Year Published:\t" + year);
System.out.println("ISBN Code:\t" + isbn);
System.out.println("Status:\t" + status);

}

This is the method I am trying to create:

public void showBooks (String first, String last)
{
for(Book book : list)
{
if(book.getAuthor() == first + " " + last)
{
book.display();
}
}
}

I can't figure out why showBooks isn't working. It's not displaying anything even after executing these statements:

b1.addAuthor ("Ian","Fleming");
myBooks.showBooks("Ian","Fleming");

Any suggestions?

[r035198x]

I'll try to explain this the best I can.

I have a class called book which creates books that each hold information such as author, title, ISBN code, etc.

Then I have another class called booklist which stores the books in an array list.

In the booklist class I am trying to write a method which displays the books only written by a specific author.

In my book class I have these methods that will help with the method I am creating:

public void addAuthor(String f, String l)
{
author = f + " " + l;
}

public String getAuthor()
{
return author;
}

public void display()
{

System.out.println("Title:\t" + title);
System.out.println("Author:\t" + author);
System.out.println("Year Published:\t" + year);
System.out.println("ISBN Code:\t" + isbn);
System.out.println("Status:\t" + status);

}

This is the method I am trying to create:

public void showBooks (String first, String last)
{
for(Book book : list)
{
if(book.getAuthor() == first + " " + last)
{
book.display();
}
}
}

I can't figure out why showBooks isn't working. It's not displaying anything even after executing these statements:

b1.addAuthor ("Ian","Fleming");
myBooks.showBooks("Ian","Fleming");

Any suggestions?

When comparing two strings in java, do not use if(string1 == string2). The == checks if the two refer to the same position in memory. Use the .equals method which compares the equality of the contents of the string variables.