What are AWT classes in Java?
AWT is heavy weight i.e. its components are using the resources of underlying operating system (OS). The java. awt package provides classes for AWT API such as TextField, Label, TextArea, RadioButton, CheckBox, Choice, List etc.
Which class is at the top of AWT hierarchy in Java?
AWTEvent class is the highest-level class in the AWT event class hierarchy.
What are AWT classes explain various features of AWT classes in details?
AWT stands for Abstract window toolkit is an Application programming interface (API) for creating Graphical User Interface (GUI) in Java. It allows Java programmers to develop window-based applications. AWT provides various components like button, label, checkbox, etc. used as objects inside a Java Program.
Which of the following is the base class of all AWT classes?
abstract Component class
The abstract Component class is the base class for the AWT. Many AWT classes are derived from it. These are the old AWT components that are no longer in use. Some of the AWT classes derived from Component are Button , Canvas , and Container .
Which of the following classes are included in Java AWT package?
The java. awt package provides classes for AWT api such as TextField, Label, TextArea, RadioButton, CheckBox, Choice, List etc.
What are the different types of AWT components?
AWT Components
- Containers. Container in Java AWT is a component that is used to hold other components such as text fields, buttons, etc.
- Button. java.awt.Button class is used to create a labeled button.
- Text Field.
- Label.
- Canvas.
- Choice.
- Scroll Bar.
- List.
Which of the following are classes of Java AWT package?
Which packages contain AWT classes?
AWT Classes
- The AWT classes are contained in the java.
- AWTEvent : Encapsulates AWT events.
- AWTEventMulticaster : Dispatches events to multiple listeners.
- BorderLayout : The border layout manager.
- Button : Creates a push button control.
- Canvas : A blank, semantics-free window.
- CardLayout : The card layout manager.
What is container and component class?
The class Component is the abstract base class for the non-menu user-interface controls of AWT. A component represents an object with graphical representation. The class Container is the superclass for the containers of AWT. The container object can contain other AWT components.
Which of the following is the root of class hierarchy?
Object Class
Object Class -The root of class hierarchy.
What are the different types of controls in AWT *?
AWT supports the following types of controls: Labels, push buttons, check boxes, check box groups, lists, scroll bars, text fields etc.
What is AWT and difference between component class and container class?
What is class hierarchy in Java?
The hierarchy of classes in Java has one root class, called Object , which is superclass of any class. Instance variable and methods are inherited down through the levels. In general, the further down in the hierarchy a class appears, the more specialized its behavior.
What are different types of hierarchy in Java?
Below are the different types of inheritance which is supported by Java.
- Single Inheritance.
- Multiple Inheritance (Through Interface)
- Multilevel Inheritance.
- Hierarchical Inheritance.
- Hybrid Inheritance (Through Interface)
What is the difference between component class and Container class in Java?
What is the difference between Component class and Container class in Java? The class Component is the abstract base class for the non-menu user-interface controls of AWT. A component represents an object with graphical representation. The class Container is the superclass for the containers of AWT.
Which class is at the top of AWT hierarchy?
Component class is at the top of AWT hierarchy. Component is an abstract class that encapsulates all the attributes of visual component. A component object is responsible for remembering the current foreground and background colors and the currently selected text font.
What is the use of AWT class in Java?
In Java, AWT contains a Choice Class. It is used for creating a drop-down menu of choices. When a user selects a particular item from the drop-down then it is shown on the top of the menu. In this example, we are creating drop-down menu that is used to get user choice from multiple choices. In Java, AWT contains a List Class.
How many types of containers are there in Java AWT?
There are four types of containers in Java AWT: The window is the container that have no borders and menu bars. You must use frame, dialog or another window for creating a window. We need to create an instance of Window class to create this container.
What is the use of choice class in AWT?
In Java, AWT contains a Choice Class. It is used for creating a drop-down menu of choices. When a user selects a particular item from the drop-down then it is shown on the top of the menu. public class Choice extends Component implements ItemSelectable, Accessible