Contents
What is the purpose of nested class?
As mentioned in the section Nested Classes, nested classes enable you to logically group classes that are only used in one place, increase the use of encapsulation, and create more readable and maintainable code.
What are the main disadvantages of using Java inner classes?
Inner classes have their disadvantages. From a maintenance point of view, inexperienced Java developers may find the inner class difficult to understand. The use of inner classes will also increase the total number of classes in your code.
What are types of nested classes in Java?
Types of Nested classes
- Non-static nested class (inner class) Member inner class. Anonymous inner class. Local inner class.
- Static nested class.
What are local classes in Java?
Local Inner Classes are the inner classes that are defined inside a block. Local Inner classes are not a member of any enclosing classes. They belong to the block they are defined within, due of which local inner classes cannot have any access modifiers associated with them.
What is the rule for local members in Java?
Rule for Local Variable Local variables cannot use any of the access level since their scope is only inside the method. Final is the Only Non Access Modifier that can be applied to a local variable. Local variables are not assigned a default value, hence they need to be initialized.
How are nested classes interacted with in Java?
Note that a static nested class interacts with the instance members of its outer class just like any other top-level class. The static nested class StaticNestedClass can’t directly access outerField because it’s an instance variable of the enclosing class, OuterClass.
Can a nested class be declared public in Java?
Static nested classes do not have access to other members of the enclosing class. As a member of the OuterClass, a nested class can be declared private, public, protected, or package private. (Recall that outer classes can only be declared public or package private .)
How is the scope of a nested class defined?
The scope of a nested class is bounded by the scope of its enclosing class. Thus in above example, class NestedClass does not exist independently of class OuterClass. A nested class has access to the members, including private members, of the class in which it is nested.
Can a nested class exist independently of an outerclass?
Thus in above example, class NestedClass does not exist independently of class OuterClass. A nested class has access to the members, including private members, of the class in which it is nested. However, the reverse is not true i.e., the enclosing class does not have access to the members of the nested class.