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.
What is the difference between component and container class in Java?
The Component class is found under java.awt package. The container class is the subclass of Component class. All non-menu-related elements that comprise a graphical user interface are derived from the abstract class Component.
What is a container class in AWT?
Class Container. public class Container extends Component A generic Abstract Window Toolkit(AWT) container object is a component that can contain other AWT components. Components added to a container are tracked in a list. The order of the list will define the components' front-to-back stacking order within the container.
What is the use of a container component?
A container is a component that can accommodate other components and also other containers. Containers provide the support for building complex hierarchical graphical user interface. Container provides the overloaded method add () to include components in the container.
How do I get the number of components in a container?
getComponent(int n) Gets the nth component in this container. getComponentAt(int x, int y) Locates the component that contains the x,y position. getComponentCount() Gets the number of components in this panel. getComponentZOrder(Component comp) Returns the z-order index of the component inside the container.
What are containers in Java?
Containers are the interface between a component and the low-level, platform-specific functionality that supports the component. Before it can be executed, a web, enterprise bean, or application client component must be assembled into a Java EE module and deployed into its container.
What is a component in Java?
A component is an object having a graphical representation that can be displayed on the screen and that can interact with the user. Examples of components are the buttons, checkboxes, and scrollbars of a typical graphical user interface.
What is the difference between container and component?
A Component is a class or function that describes part of a React UI. Container is an informal term for a React component that is connect -ed to a redux store.
What is component and container in AWT?
A container provides a space where a component can be located. A Container in AWT is a component itself and it adds the capability to add component to itself. Following are noticable points to be considered. Sub classes of Container are called as Containter. For example Panel, Frame and Window.
What is a container class Java?
A Container class can be described as a special component that can hold the gathering of the components. There are two types of Swing Containers, they are top-level containers and low-level containers. Top-Level containers are heavyweight containers such as JFrame, JApplet, JWindow, and JDialog.
What are components of a class?
This article will explore the actual components of a class....Class components to discuss include:Class name—How the class name is identified.Comments—How to create comments to document your code.Attributes—How to define attributes for use in the class.Constructors—Special methods used to properly initialize a class.More items...•
What is component in advanced Java?
Components. All the elements like the button, text fields, scroll bars, etc. are called components. In Java AWT, there are classes for each component as shown in above diagram. In order to place every component in a particular position on a screen, we need to add them to a container.
What is the difference between element and component?
There is certainly a difference between elements and components. Furthermore, a component refers to a small part of a larger entity that mostly is a manufactured object. In contrast, an element is one the simplest parts of which anything consists of.
What is component and container in React?
Container components can be primarily referred to as the parent elements of other components in a React app. They serve as a bridge between the normal components that render the UI and the logic that makes the UI components interactive and dynamic. The most common function of a container component is to obtain data.
What is Java container object?
A generic Abstract Window Toolkit(AWT) container object is a component that can contain other AWT components. Components added to a container are tracked in a list. The order of the list will define the components' front-to-back stacking order within the container.
What are components of AWT in Java?
The AWT provides nine basic non-container component classes from which a user interface may be constructed. (Of course, new component classes may be derived from any of these or from class Component itself.) These nine classes are class Button, Canvas, Checkbox, Choice, Label, List, Scrollbar, TextArea, and TextField.
What is container in Java Swing?
Containers are an integral part of SWING GUI components. A container provides a space where a component can be located. A Container in AWT is a component itself and it provides the capability to add a component to itself. Following are certain noticable points to be considered.
What is a component in Spring?
@Component is an annotation that allows Spring to automatically detect our custom beans. In other words, without having to write any explicit code, Spring will: Scan our application for classes annotated with @Component. Instantiate them and inject any specified dependencies into them.
What are the components of a class in Java?
There are three major components of class in Java. Variable. Variable is a reserved memory location to hold a value. ... Constructor. ... Method.
What are the components of object?
A component is a collection of objects that furnish a set of offerings to different systems. They have many elements in frequent with objects. Components can also be run both locally or in a distributed fashion....Difference between Component and Object :S.No.ComponentObject8.A component is usually static.An object is dynamic.7 more rows•Jul 17, 2020
What is difference between @service and @component?
@Component is a generic stereotype for any Spring-managed component. @Service annotates classes at the service layer. @Repository annotates classes at the persistence layer, which will act as a database repository.
What is servlet container?
The servlet container is the part of web server which can be run in a separate process. We can classify the servlet container states in three types: Standalone: It is typical Java-based servers in which the servlet container and the web servers are the integral part of a single program. For example:- Tomcat running by itself.
What is servlet in Java?
The client/user can request only a static WebPages from the server. If the user wants to read the web pages as per input then the servlet container is used in java.
Why is Tomcat separated from the web server?
In-process: It is separated from the web server, because a different program runs within the address space of the main server as a plug-in. For example:- Tomcat running inside the JBoss.
Serialization
It is important to note that only AWT listeners which conform to the Serializable protocol will be saved when the object is stored. If an AWT object has listeners that aren't marked serializable, they will be dropped at writeObject time. Developers will need, as always, to consider the implications of making an object serializable.
Field Details
Ease-of-use constant for getAlignmentY () . Specifies an alignment to the top of the component.
Constructor Details
Constructs a new component. Class Component can be extended directly to create a lightweight component that does not utilize an opaque native window. A lightweight component must be hosted by a native container somewhere higher up in the component tree (for example, by a Frame object).
Types of Components in Component Class
- The components in a component class are as follows : 1. Container 2. Button 3. Label 4. Checkbox 5. Choice 6. List All these components are present in java.awt package. We can import each of the components individually i.e., import java.awt.Button, import java.awt.Containeretc. T…
Button
- 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 it needs to implement Acti…
Label
- 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 should be aligned to right. 3. CENTER spe…
Checkbox
- 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 commands: Output: In the above output, …
Choice
- 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:
List
- 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: In this output List, we can select multiple ite…