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Short Q&A about constructors

  Q1: What is a constructor in Java, and when is it called? A1: A constructor in Java is a special method used to initialize objects. It is called when an instance of a class is created, allocating memory for the object in RAM. Q2: What happens if a class in Java does not have any constructor defined? A2: If a class in Java doesn't have any constructor defined, the Java compiler provides a default constructor by default. Q3: What are the two types of constructors in Java? A3: There are two types of constructors in Java:  1. No-arg constructor (Default constructor) 2. Parameterized constructor Q4: What are the rules for creating a Java constructor? A4: The rules for creating a Java constructor are as follows: - Constructor name must be the same as its class name. - A constructor must have no explicit return type. - A Java constructor cannot be abstract, static, final, or synchronized. Q5: What are the different access modifiers that can be used while declaring a constructor in ...
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Chapter No 6 Interface Java

  Chapter 6                      Interfaces   6.1 Introduction  6.2. Defining and Implementing Interfaces   6.3. Advantages of using Interface    6.1 Introduction   An interface in Java is a collection of abstract methods. It provides a way to achieve abstraction and multiple inheritance in Java. An interface is a blueprint for a class and allows the definition of methods without specifying the implementation. Classes implementing an interface must provide concrete implementations for all its methods.   Syntax   interface MyInterface{ {      // Declare methods (implicitly public and abstract)      void method1();      void method2(); }   Explanation   An interface is declared using the interface keyword.  Methods declared in the interface ar...
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