Class Component (package java. awt ) is a superclass that declares the common features of GUI components in packages java.
Which class is superclass of every class?
The class named Object is the super class of every class in Java.
What is super class in Android?
In java the keyword super refers to the superclass of the class in which super appears. A subclass inherits the accessible variables and methods from its superclass, but the constructors of the superclass are not inherited in the subclass. They can only be invoked from constructors of subclass using the keyword super.
Which of these class is superclass?
Explanation: Object class is superclass of every class in Java.
Which class is the super class of all Swing components?
The class JComponent is the base class for all Swing components except top-level containers. To use a component that inherits from JComponent, you must place the component in a containment hierarchy whose root is a top-level SWING container.
What does float a 35 0 return mean?
10) What does the expression float a = 35 / 0 return? Explanation: In Java, whenever we divide any number (double, float, and long except integer) by zero, it results in infinity. … But on dividing an integer by zero, it throws a runtime exception, i.e., java.lang.ArithmeticException.
Is the object class final?
Use of hashCode() method : Returns a hash value that is used to search object in a collection. … The returned Class object is the object that is locked by static synchronized methods of the represented class. As it is final so we don’t override it.
What is overriding in Java?
The benefit of overriding is: ability to define a behavior that’s specific to the subclass type, which means a subclass can implement a parent class method based on its requirement. … In object-oriented terms, overriding means to override the functionality of an existing method.
Can we use super super in Java?
In Java, a class cannot directly access the grandparent’s members. It is allowed in C++ though.
What is super class in Java?
Definitions: A class that is derived from another class is called a subclass (also a derived class, extended class, or child class). The class from which the subclass is derived is called a superclass (also a base class or a parent class).
What is a class dependency?
What is a Dependency? Whenever a class A uses another class or interface B, then A depends on B. A cannot carry out it’s work without B, and A cannot be reused without also reusing B. In such a situation the class A is called the “dependant” and the class or interface B is called the “dependency”.
Which method of object class can clone an object?
Discussion Forum
| Que. | Which of these method of Object class can clone an object? |
|---|---|
| b. | copy() |
| c. | Object clone() |
| d. | clone() |
| Answer:Object clone() |
Which class is superclass of string and StringBuffer class?
Discussion Forum
| Que. | Which of these class is superclass of String and StringBuffer class? |
|---|---|
| b. | java.lang |
| c. | ArrayList |
| d. | None of the mentioned |
| Answer:java.lang |
Does swing follows MVC?
Swing API architecture follows loosely based MVC architecture in the following manner. Model represents component’s data. … Swing component has Model as a seperate element, while the View and Controller part are clubbed in the User Interface elements. Because of which, Swing has a pluggable look-and-feel architecture.
What is @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 AWT and Swing?
The main difference between AWT and Swing in Java is that AWT is Java’s original platform dependent windowing, graphics and user interface widget toolkit while Swing is a GUI widget toolkit for Java that is an extension of AWT.