0
This chapter covers a special type of Component called Container. A Container is a subclass of Component that can contain other components, including other containers. Container allows you to create groupings of objects on the screen. This chapter covers the methods in the Container class and its subclasses: Panel, Window, Frame, Dialog, and FileDialog. It also covers the Insets class, which provides an internal border area for the Container classes.
What else can I help you with?
What modifier do you use to prevent that class from having any subclasses?
In Java, you use the final modifier to prevent a class from having any subclasses.
Why the container is an abstract class in java?
A container is a generic term for an object that can contain other objects. It is not a type of object you can construct, and so therefore it is abstract. Specific instances of containers (such as Windows, Frames, and Panels) all share similar functionality, and so they all inherit from the container class so as to reduce the amount of code that had to be written, and allow each container to accept other containers and components without having to code for each specific container and component directly.
Which component class is also a container in JAVA?
Well, the Container extends Component, so ALL containers in Java are components. This includes classes like Panel, ScrollPane, Window, and JComponent. Plus all the various generations of subclasses of each of those containers.
Can you access a protected member from a Sub class outside the package of its Base class?
Protected members of a class are only accessible to its subclasses and to friends of the class or its subclasses. However, if a subclass changes the access to private, only the subclass and its friends have access but this does not affect the access rights of its ancestors or their friends.
What is topleval class in java?
The top level class in Java is "Object." All other classes are subclasses of Object by default.
What modifier do you use to prevent that class from having any subclasses?
In Java, you use the final modifier to prevent a class from having any subclasses.
Why the container is an abstract class in java?
A container is a generic term for an object that can contain other objects. It is not a type of object you can construct, and so therefore it is abstract. Specific instances of containers (such as Windows, Frames, and Panels) all share similar functionality, and so they all inherit from the container class so as to reduce the amount of code that had to be written, and allow each container to accept other containers and components without having to code for each specific container and component directly.
Which component class is also a container in JAVA?
Well, the Container extends Component, so ALL containers in Java are components. This includes classes like Panel, ScrollPane, Window, and JComponent. Plus all the various generations of subclasses of each of those containers.
Can you access a protected member from a Sub class outside the package of its Base class?
Protected members of a class are only accessible to its subclasses and to friends of the class or its subclasses. However, if a subclass changes the access to private, only the subclass and its friends have access but this does not affect the access rights of its ancestors or their friends.
What is topleval class in java?
The top level class in Java is "Object." All other classes are subclasses of Object by default.
What is a super class in terms of object oriented programming?
A superclass, also referred to as a parent class, is a class what which other classes are derived from. These derived classes are known as either subclasses or child classes.
What is transitive nature of inheritance?
Inheritance is transitive, i.e., if a class B inherits properties of another class A, then all subclasses of B will automatically inherit the properties of class A.
What is the scientific name for mussels?
Mussels as a group comprise many different species in the class Bivalvia; they are mainly found in the three subclasses Pteriomorphia, Paleoheterodonta and Heterodonta. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Subclasses | Pteriomorpha (marine mussels) Palaeoheterodonta (freshwater mussels) Heterodonta (zebra mussels)
What are the advantages of using Hierarchical Inheritance in Java?
Hierarchical inheritance in Java allows multiple subclasses to inherit from a single parent class, promoting code reuse and reducing redundancy. Key advantages include: Code Reusability: Subclasses inherit common properties and methods from the parent class, reducing the need to write repetitive code. Maintainability: Changes made to the parent class are automatically reflected in all subclasses, simplifying code maintenance. Modularity: It enables a clear structure where common functionality is centralized, and specific features can be extended in subclasses. Efficiency: Inheritance minimizes code duplication, leading to more efficient and streamlined code.
Why is chondrichtyes in class?
Chondrichthyes are divided into two subclasses, these are elasmobranchii, and holocephali. These are both marine species and have skeletons made out of cartilage.Ê
Subclasses of an abstract class that do not provide an implementation of an abtract method are also abstract?
Yes. Any class that does not provide implementation to all its methods as well as its parent class methods needs to be Abstract. The Java compiler would not successfully compile a class that does not do this.
Why do you have to retest subclasses that are instantiated from an existing class if the existing class has already been thoroughly tested?
i dont even know it !!!! that why i came to this website to find answer not for me to answer the dam question.
