How to get values and keys from HashMap?

I'm writing a simple edit text in Java. When the user opens it, a file will be opened in JTabbedPane. I did the following to save the files opened:

HashMap<String, Tab> hash = new HashMap<String, Tab>();

Where Tab will receive the values, such as: File file, JTextArea container, JTabbedPane tab.

I have a class called Tab:

public Tab(File file, JTextArea container, JTabbedPane tab)
{
    this.file = file;
    this.container = container;
    this.tab = tab;
    tab.add(file.getName(), container);
    readFile();
}

Now, in this SaveFile class, I need get the Tab values stored in the HashMap. How can I do that?