The class which implements KeyListener interface becomes our custom key event listener. This listener can not directly listen the key events. It can only listen the key events through intermediate objects such as JFrame.

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The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.


JTextfield Listener for Integers

A better approach for this use case is to use the DocumentFilter class instead. See the following example How do I format JTextField text to uppercase.

I'm presuming that "charCount" was set earlier (or even passed in as a parameter) for the number of characters that the field accepts. That iterator creates a sequence of sub-text-fields; each of which will handle one character and immediately update the position of the caret. Note that the document needs to be unique to each field, or the text will duplicate itself the whole way across!


JTextField and keyListener java swing

Here ld is an object created within loginDialog object. But they are two different JDialog objects.

A Database Table: The table is a matrix with data. The table in a database looks like a simple spreadsheet.


The Connection URL: A connection URL for the MySQL database is JDBC:MySQL://localhost:3306/project where JDBC is the API, MySQL is the database, localhost is the server name on which MySQL is running, you may also use an IP address, 3306 is the port number and project is the database name. You may use any database, in such case, you need to replace the project with your database name.

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Public interface KeyListener extends EventListener The listener interface for receiving keyboard events (keystrokes). The class that is interested in processing a keyboard event either implements this interface (and all the methods it contains) or extends the abstract KeyAdapter class (overriding only the methods of interest).

Now, whenever the submit button is clicked, onClick() method of submitButton is called and the user input values are stored in the name and password variables using the getText() method on EditText instances. Then, using setText() method, the input values are displayed in the TextView.

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Is this because my UI is made up of only one JTextArea, one JTextField, and one JLabel? I have a feeling that I need to have some "background" of the UI showing in order for this to work.


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Password: A Password is given by the user at the time of installing the MySQL database. In that example, we are going to use the root as the password.

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Write a function definition of occurrences(text1, text2) that takes two string arguments. The function returns the number of times a character from the first argument occurs in the second argument.

As the name of the method suggests, findViewById() returns an instance for the view defined in layout XML. In other words, this method is used to get the view instance in Java, that you have made and used in layout XML. This is done by mentioning the id of the view that you have defined in XML. The view created in XML is used in Java to manipulate it dynamically.


Update I got it working by expanding on the ideas you guys gave me and I also added a Scroll Pane. The scroll bar is not showing up so if anyone can give me some advice as to why the scroll pane is not working properly.

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Additionally, it will help very much if you look into proper formatting of your question in the future. I can't upvote it in its current condition, and it will be received much better by the community.


Unlike with adding a listener directly to the document, this handles the (uncommon) case that you install a new document object on a text component. Additionally, it works around the problem mentioned in Jean-Marc Astesana's answer, where the document sometimes fires more events than it needs to.

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Now are adding the ActionListener to the button within loginDialog object, which is not yet visible. While there is no ActionListener added to the Button within ld object.

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How to Write a Document Listener (The Java™ Tutorials > Creating, A Swing text component uses a Document to represent its content. Document events occur when the content of a document changes in any way. You attach a The default implementation of the Document interface (AbstractDocument) supports asynchronous mutations.

The Java KeyListener is notified whenever you change the state of key. It is notified against KeyEvent.


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A semantic event which indicates that an object's text changed. This high-level event is generated by an object (such as a TextComponent) when its text changes. The event is passed to every TextListener object which registered to receive such events using the component's addTextListener method. The object that implements the TextListener interface gets this TextEvent when the event occurs.

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Here the ResultSet object maintains a cursor pointing to its current row of data. In the beginning, the cursor is positioned before the first row. And the next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be applied within a while loop to repeat through the result set.

When using Swing you SHOULD be using Key Bindings. All Swing components use Key Bindings. The Key Bindings blog entry gives some basics on how to use them and contains a link to the Swing tutorial on "How to Use Key Bindings" for more detailed information.


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Of course this will only display something if the user typed something into the text field. The point is you will only see output if there is something to display. You can always verify that a piece of code is being executed by displaying a hard coded string.