The Abstract Window Toolkit (AWT) is Java’s original platform-dependent windowing, graphics, and user-interface widget toolkit preceding Swing.AWT Components in Java
Canvas, in general sense, is a cloth where a painter can put some painting. But for us, Canvas is a class from java.awt package on which a programmer can draw some shapes or display images. A mouse click or a keyboard key press on the canvas can generate events and these events can be converted …
The FileDialog class provides a File Open or Save dialog box enabling us to access the local file system. The FileDialog class of Java is OS dependent and calls operating system's specific Open File dialog box or Save dialog box. The advantage of this is that the users of Java program will see familiar screens. …
Java AWT Adapters are abstract classes from java.awt.event package introduced with JDK 1.1. Adapter classes make event handling simple and easy. Adapters usage replaces the listeners; adapters make event handling easy to the programmer. Every listener that includes more than one abstract method has got a corresponding adapter class. The advantage of adapter is that …
1. Creating Smiley Face This tutorial, "Draw Smiley Face Java Nested Panels", gives command over graphics to a novice. Fill ovals and arc are arranged in such way it looks smiley face. For beautification, a background color of pink (predefined color) is given. Example on Smiley Face import java.awt.*; public class SmileyFace extends Frame { …
The paint() method is called by the JVM implicitly in two circumstances. One is when the first time frame is created and displayed. The other is when the frame is resized (by dragging the frame border with mouse) by the user. If the programmer would like to call the paint() method in the middle of …
The scrollbar scrolls through a range of integer values. It is a very convenient component to take a value from the user within a range of values. Scrollbar have two orientations: Vertical or Horizontal. Scrollbar can be set with maximum and minimum values within which the scrollbar moves. The scroll bar may be given an …
After learning the GUI creation through 8 steps, for more command over button event handling, apart this one, another two programs are given – Making Button Enabled and Making Button Invisible. In this program, the same button label toggles between Bharath and India. When Bharath is clicked, the button label changes to India and when …
Menus are very familiar to a programmer in Windows environment. A menu comes with a pull-down list of menu items from which user can select one at a time. When a lot of options in different categories exist to be opted by the user, menus are the best choice as they take less space on …
We know earlier in "Java Layout Managers" that two styles of placing components in containers – pixel format and position format. Now let us discuss clearly what pixel format is and how to place a component in terms of pixels. We also know earlier, the default layout manager for Frame is BorderLayout and for Panel …
List permits the selection of multiple items (Choice allows single selection). Programmer prefers List when checkboxes are many to display (in case of Choice, when radio buttons are many to display). List adds a scrollbar with which items can be scrolled and seen. List can be designed for single selection or multiple selection (Java AWT …
Java TextArea overcomes the limitation of TextField and is used to display or take input in multiple lines of text. Following list illustrates the limitations. Differences between TextField and TextArea TextField displays only one line of text of any length. TextArea displays multiple lines of text of any length. TextField generates ActionEvent handled by ActionListener …
After having the basic idea of GUI, let us know how many Java AWT Components classes exist with java.awt package. This knowledge is essential to go further in the tutorial. As you can observe from the above hierarchy, Component is the super class of all Java components and is declared as abstract. That is, we …
The frame created by the programmer and displayed on the monitor comes with a title bar and three icons(buttons) on the title bar – Minimize, Maximize and Close. The first two works implicitly and the Close does not work and requires extra code to close the frame. Java Frame Closing – 4 styles Four styles …
The frame created by the programmer and displayed on the monitor comes with a title bar and three icons(buttons) on the title bar – Minimize, Maximize and Close. The first two works implicitly and the Close does not work and requires extra code to close the frame. Java Frame Closing – 4 styles Four styles …
Java AWT Panels play a very important role in layout management. Panels in combination with layout managers render the desired layout to the programmer. Following hierarchy gives the place of Panel in AWT API. java.lang.Object –> java.awt.Component –> java.awt.Container –> java.awt.Panel –> java.applet.Applet Properties of Java AWT Panels As you can see from the hierarchy, …
Java AWT Listeners are a group of interfaces from java.awt.event package. Listeners are capable to handle the events generated by the components like button, choice, frame etc. These listeners are implemented to the class which requires handling of events. public class ButtonDemo1 extends Frame implements ActionListener The class ButtonDemo1 implements ActionListener as ButtonDemo1 includes some …
Choice, another GUI component from the toolkit of classes of java.awt. Choice presents a pull-down menu. Choice is a replacement to radio buttons. Choice is chosen when radio buttons are many to display. Choice is popularly known as Combo box in other GUI environments. Choice, like radio buttons, allows selecting only one option among many. …
Radio buttons give a more user friendly environment when the user has to select only one option among many. There is no radio button class in java.awt package. Radio buttons are a group of checkboxes grouped as one unit. In the unit, if another radio button is selected, the earlier gets automatically deselected. Because radio …
This is second program on TextField, first being User Name Password Validation (applet version is also available). The methods like setColumns(), setText() and setFont(), getColumns() and getText() are used to set and get the properties. Example on using Java TextField Methods import java.awt.*; public class TextFieldProperties extends Frame { TextField tf1, tf2, tf3; public TextFieldProperties() …
Important text can be made eye-catching by displaying in attractive fonts. A font represents a combination of a font name (like Monospaced), font style (like bold) and font size (like 20). Following is the class signature public class Font extends Object implements Serializable The Font constructor takes three parameters to create a Font object. Font …
