Can we declare inner class as private?

Can we declare inner class as private?

Unlike a class, an inner class can be private and once you declare an inner class private, it cannot be accessed from an object outside the class. Following is the program to create an inner class and access it. In the given example, we make the inner class private and access the class through a method.

Can we declare local inner classes as private or protected or public?

Since the local inner class is not associated with Object, we can't use private, public or protected access modifiers with it. The only allowed modifiers are abstract or final. ... Additionally, it can also access a non-final local variable of the method in which it is defined, but it cannot modify them.

Can methods be declared private?

You can not declare any variable with access specifier within a method. You can do it by defining inner class and declaring private variables inside that. And yes that can be accessed from that method.

Can inner class have constructor?

5 Answers. You can observe the constructor chain for the inner class when you extend an inner class. so you can see that you are able to call the super constructor of your nested class passing to that constructor the MainClass , and calling . super on mainClass object instance.

What are disadvantages of using inner classes?

Q7)What are disadvantages of using inner classes?

• Using inner class increases the total number of classes being used by the application. ...
• Inner classes get limited support of ide/tools as compared to the top level classes, so working with the inner classes is sometimes annoying for the developer.

Can I use private class fields?

There is a restriction on private static fields: Only the class which defines the private static field can access the field. This can lead to unexpected behavior when using this . In the following example, this refers to the SubClass class (not the BaseClassWithPrivateStaticField class) when we try to call SubClass.

What is meant by private visibility of a method?

Private in Java means the variable or method is only accessible within the class where it is declared. If your impression about private was true, it will not be accessible anywhere ever which makes it completely useless.

Is inner class a good practice?

Any additional encapsulation, such as making the entire inner class private , is desirable; but public inner classes are perfectly acceptable. There are many examples in Java, such as AbstractMap.

Which is true about local inner class?

Which is true about a method-local inner class? It must be marked final. ... Option B is correct because a method-local inner class can be abstract, although it means a subclass of the inner class must be created if the abstract class is to be used (so an abstract method-local inner class is probably not useful).

Can a class be accessed from an inner class?

Inner Class. Unlike a class, an inner class can be private and once you declare an inner class private, it cannot be accessed from an object outside the class. Following is the program to create an inner class and access it. In the given example, we make the inner class private and access the class through a method.

How to declare a local inner class in Java?

However From JDK 8, it is possible to access the non-final local variable of enclosing block in local inner class. A local class has access to the members of its enclosing class . Local inner classes can extend an abstract class or can also implement an interface. Declaring a Local Inner class: A local inner class can be declared within a block.

Can a local inner class access a non final local variable?

Till JDK 7,Local inner class can access only final local variable of the enclosing block. However From JDK 8, it is possible to access the non-final local variable of enclosing block in local inner class. A local class has access to the members of its enclosing class .

Can a local inner class be instantiated from outside a block?

Local inner class cannot be instantiated from outside the block where it is created in. Till JDK 7,Local inner class can access only final local variable of the enclosing block. However From JDK 8, it is possible to access the non-final local variable of enclosing block in local inner class.