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GUI Components. A GUI component is an object that represents a screen element such as a button or a text field. GUI-related classes are defined primarily in the java.awt and the javax.swing packages. The Abstract Windowing Toolkit (AWT) was the original Java GUI package.
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A major part of creating a graphical user interface in Java is figuring out how to position and lay out the components of the user interface to match the appearance you desire.
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- Container
- Button
- Label
- Checkbox
- Choice
- List
The Container is a component that will be used to extend other components such as window, panel, Frame, Dialog, and Applet as shown in the above diagram. 1. Window:The Window is a Container that doesn’t include borders and a menu bar. We must use another window, frames, and dialogue box to create a Window. Creating an instance is the way to create ...
A button is a labeled component when clicked performs an event. It is created by the Button class. When clicked it performs some action by sending an instance of ActionEvent by AWT. ActionEvent calls processEvent on the button and it receives all the events and performs action by calling the processActionEvent method of its own. To do such things i...
It is used to show text in the Container. It will displays text in the form of READ-ONLY, which cannot be changed by the user directly. We need to create an instance of Label Class to create a Label. The Declaration of Label Class will be It has 3 constructors: 1. LEFT: specifies that text should be aligned to left. 2. RIGHT: specifies that text sh...
It is used to create a Checkbox in the Container. It can get a value either true or false by checking and unchecking the checkbox. 1. checked – returns true 2. unchecked – returns false It can be created by creating an instance of Checkbox. The Declaration of Label Class will be It has 5 constructors: Example 1: We can run it by the following comma...
It is used to show the popup menu to select any item from the menu items. The selected choice will be shown at the top of the menu bar. We need to create an instance of Choice Class to create a Choice. The Declaration of Choice Class will be It has 1 constructor: Example: We can run it by the following commands: Output:
The List Object creates a list of items in which we can choose one or multiple items at a time. We need to create an instance of List Class to create a List. The Declaration of Label Class will be It has 3 constructors: Example: We can run it by the following commands: Output 1: In this output List, we can select any one item at a time. Output 2: I...
Feb 10, 2021 · Java interface. A set of methods that define some behavior (partial API) for a class. Design benefits. ・Enables callbacks, which promotes code reuse. ・Facilitates lambda expressions. This course. ・Yes: use interfaces built into Java (for sorting and iteration). ・No: define our own interfaces; lambda expressions. 25
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Java’s GUI components include labels, text elds, text areas, buttons, pop-up menus, etc. The SWING Toolkit also includes containers which can include these components. Containers include frames (windows), canvases (which are used to draw on), and panels (which are used to group components).
† Putting standard components in a window: buttons, text areas, scroll panels, menus etc. † Constructing your own graphics: draw shapes, images, text † Handling events from components.
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This Swing Java Tutorial describes developing graphical user interfaces (GUIs) for applications and applets using Swing components.
