best core java training in bangalore


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Presentation Transcript

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Why we used inner classes in java

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 In Java just like methods variables of a class too can have another class as its member. Writing a class within another is allowed in Java. The class written within is called the nested class and the class that holds the inner class is called the outer class. Nested Classes :

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Inner classes are a security mechanism in Java. We know a class cannot be associated with the access modifier private but if we have the class as a member of other class then the inner class can be made private. And this is also used to access the private members of a class. Best core java training in bangalore Inner Classes Non-static Nested Classes :

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Types Of Inner Class : Inner classes are of three types depending on how and where you define them. They are : 1 Inner Class 2 Method-local Inner Class 3 Anonymous Inner Class

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Inner Class : Inner class we just need to write a class within a class. Unlike a class advanced java training in bangalore an inner class can be private and once we declare an inner class private it cannot be accessed from an object outside the class.

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Method-local Inner Class : In Java we can write a class within a method and this will be a local type. Like local variables the scope of the inner class is restricted within the method. A method-local inner class can be instantiated only within the method where the inner class is defined.

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Anonymous Inner Class : An inner class declared without a class name is known as an anonymous inner class. In case of anonymous inner classes we declare and instantiate them java/j2ee classes in bangalore at the same time. Generally they are used whenever we need to override the method of a class or an interface.

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Advantages Of Java Inner Classes --

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1 Nested classes represent a special type of relationship that is it can access all the members data members and methods of outer class including private. 2 Nested classes are used to develop more readable and maintainable code because it logically group classes and interfaces in one place only. 3 Code Optimization: It requires less code to write.

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Why Use Nested Classes

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1 It is a way of logically grouping classes that are only used in one place: If a class is java training center bangalore useful to only one other class then it is logical to embed it in that class and keep the two together. Nesting such "helper classes" makes their package more streamlined.

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2 It increases encapsulation: Consider two top-level classes A and B where B needs access to members of A that would otherwise be declared private. By hiding class B within class A As members can be declared private and B can access them . In addition B itself can be hidden from the outside world.

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3 It can lead to more readable and maintainable code: Nesting small classes within top-level classes places the code closer to where it is used.

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Difference between nested class and inner class in Java : Inner class is a part of nested class. Non-static nested classes are known as inner classes. Java course in bangalore

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Internal working of Java member inner class : The java compiler creates two class files in case of inner class. The class file name of inner class is "OuterInner". If we want to instantiate inner class we must have to create the instance of outer class. In such case instance of inner class is created inside the instance of outer class.

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Internal code generated by the compiler :  The java compiler creates a class file named OuterInner in this training center bangalore The Member inner class have the reference of Outer class that is why it can access all the data members of Outer class including private.

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