Give each an ActionListener for its action.
Create a new popup menu to display our options While(!(ac instanceof Frame)) ac = ac.getParent() ĬtLayout(new GridLayout(2,1, 10, 10)) List of imports detailing the dependencies on the basic libraries. As before we put these classes into package jbgui and start with a long Note that there is no main function anywhere in thisįile. Here is the file AllenApplet.java, which definesĪ single public class. The combo box is used to set font options in the TextAreaĪnd the popup menu is used to set color choices for the background. The basic idea of this applet is that the user may enter text into the textįield and then either hit the enter key or the button. The applet, named AllenApplet, also has an invisible JPopupMenu that can be A combo box is a "dropdown list" similar to what you
A text field isĪ single line of text, intended for user input. May hold more text than can be displayed in a fixed window. Here we will also give it a scroller so that it We will show a fairly large window with four visible components: a JTextArea,Ī JTextField, a JButton, and a JComboBox. The user need not worry that an applet was created by a rogue compiler and mayĪpplets don't need a graphic interface, though most applets have them. On applets, while known to compilers, are not enforced primarily by compilers,īut by the run time systems embedded in browsers and applet viewers. Is a self contained region of a window that can hold other components. The class JApplet is itself a subclass of Panel (actuallyĪ subclass of which itself is a subclass of Panel), which Then an applet may take advantage of them.įrom a language standpoint, an applet is an object of a class with Īs its superclass. That machine, however, and if that source machine provides various servers,
Than the machine from which they were loaded. Write local files, and they may not connect via the web to any machine other If applets are to be built and compiled by persons unknown and downloadedĪnd run on your computer, you need confidence that they will not, indeedĬannot, harm your files or computing environment. Obtain almost no information about the computer or environment that they run On a limited conversation with the viewer (via the AppletContext) but may They are embedded in a frame created by their viewer. With the Java JDK, and with most development environments, however.Īpplets are intended to run within the context of a web browser or similar You will probably not be able to view this applet in current browsers as mostĪre not up to the Java 2 standards yet.
As before, the code is almost entirely initialization and event The running program will consist of about forty objects, though some of these The second file willĬontain a dialog box that we need to help us set user determined colors. In the first file we defines a single class,ĪllenApplet, and seven inner classes to handle events. Used the AWT, whereas this version uses the Java Foundation Classes and the
Now we are going to look at an applet that has many of the sameįeatures of AllenApp, but illustrates some additional events and GUI elements. It showed event handling forĪction and mouse events as well as simple drawing, dialogs, fonts, and a few The first part focused on applications and menus. Pace this paper we will see some elements of applet GUI programming. or GUI Programming in Java for Everyone Part 2 Applets (Version 3) Joseph Bergin The price and discount are user input values from textfields in the beginning of the code.GUI Programming in Java 1.1, Part 2 Graphical User Interface Programming for Multi-Platform Applications in Java 2. I'm trying to create a Retail Calculator for a class and need to multiply two values together (Price, Discount) in order to get the sale's price when the user hits a Calculate button.
View Replies View Related How To Get Calculation To Work Using User Input From Textfields Feb 23, 2014Īs stated in the subject I'm a newbie when it comes to Java Programming (I'm in my second week of class). Private void textField1FocusGained( evt) īut it doesn't seem to work. Right now I've started adding a focusgained listener to each textbox like this: I have a bunch of textboxes in a panel and I wanted to perform the same code when the user clicks into a textbox (select all the text in it). Swing/AWT/SWT :: Multiple Textfields Using FocusGained Event Oct 11, 2014