Java classes, constructors, inheritance, interfaces, abstract classes, records, enums, access modifiers, static and final, and inner classes.
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- What is a class?
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A blueprint for creating objects that defines fields (state) and methods (behavior).- What is an object?
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An instance of a class, created using the new keyword.- What keyword is used to create an object from a class?
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The new keyword, followed by the class name and a constructor call.- What is a constructor?
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A special method that initializes an object when it is created.- What is the default constructor?
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A no-argument constructor automatically provided by Java if no constructors are explicitly defined.- What is constructor overloading?
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Defining multiple constructors in the same class with different parameter lists.- What keyword calls another constructor in the same class?
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The this keyword, written as this(arguments).- What keyword is used to access the parent class from a subclass?
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The super keyword.- What keyword establishes inheritance in Java?
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The extends keyword, allowing a child class to inherit from a parent class.- What is method overriding?
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Redefining a parent class method in a child class with the same method signature.- Does Java support multiple inheritance for classes?
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No, a class can extend only one other class.- What is the relationship between a class and an interface in Java?
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A class implements an interface; it does not inherit from it.- What is an interface?
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A contract that defines a set of abstract methods that any implementing class must provide.- What keyword implements an interface?
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The implements keyword.- What types of fields can an interface contain?
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Only constants, which are implicitly public static final.
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