>java ListPool$MyLinkedList$Node in Java

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>java ListPool$MyLinkedList$Node
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Note that the class Node is specified using the full name of the class file minus the extension
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83 Non-Static Member Classes
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Non-static member classes are inner classes that are defined without the keyword static as members of an enclosing class or interface Non-static member classes are on par with other non-static members defined in a class The following aspects about non-static member classes should be noted:
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CHAPTER 8: NESTED TYPE DECLARATIONS
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An instance of a non-static member class can only exist with an instance of its enclosing class This means that an instance of a non-static member class must be created in the context of an instance of the enclosing class This also means that a non-static member class cannot have static members In other words, the non-static member class does not provide any services, only instances of the class do However, final static variables are allowed, as these are constants Code in a non-static member class can directly refer to any member (including nested) of any enclosing class or interface, including private members No fully qualified reference is required Since a non-static member class is a member of an enclosing class, it can have any accessibility: public, package/default, protected, or private A typical application of non-static member classes is implementing data structures For example, a class for linked lists could define the nodes in the list with the help of a non-static member class which could be declared private so that it was not accessible outside of the top-level class Nesting promotes encapsulation, and the close proximity allows classes to exploit each other s capabilities
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Instantiating Non-Static Member Classes
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In Example 85, the class MyLinkedList at (1) defines a non-static member class Node at (5) The example is in no way a complete implementation for linked lists Its main purpose is to illustrate nesting and use of non-static member classes
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Example 85
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Defining and Instantiating Non-static Member Classes
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class MyLinkedList { private String message = "Shine the light"; public Node makeInstance(String info, Node next) { return new Node(info, next); } public class Node { // static int maxNumOfNodes = 100; final static int maxNumOfNodes = 100; private String nodeInfo; private Node next; public Node(String nodeInfo, Node next) { thisnodeInfo = nodeInfo; thisnext = next; } // (1) // (2) // (3) // (4)
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// // // //
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(5) NSMC (6) Not OK (7) OK (8)
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// (9)
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public String toString() { return message + " in " + nodeInfo + " (" + maxNumOfNodes + ")"; // (10) } } }
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83: NON-STATIC MEMBER CLASSES public class ListClient { public static void main(String[] args) { MyLinkedList list = new MyLinkedList(); MyLinkedListNode node1 = listmakeInstance("node1", null); Systemoutprintln(node1); // MyLinkedListNode nodeX // = new MyLinkedListNode("nodeX", node1); MyLinkedListNode node2 = listnew Node("node2", node1); Systemoutprintln(node2); } } // // // // // (11) (12) (13) (14) (15)
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// (16) Not OK // (17) // (18)
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Output from the program:
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Shine the light in node1 (100) Shine the light in node2 (100)
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First, note that in Example 85, the declaration of a static variable at (6) in class Node is flagged as a compile-time error, but defining a final static variable at (7) is allowed A special form of the new operator is used to instantiate a non-static member class: <enclosing object reference>new <non-static member class constructor call> The <enclosing object reference> in the object creation expression evaluates to an instance of the enclosing class in which the designated non-static member class is defined A new instance of the non-static member class is created and associated with the indicated instance of the enclosing class Note that the expression returns a reference value that denotes a new instance of the non-static member class It is illegal to specify the full name of the non-static member class in the constructor call, as the enclosing context is already given by the <enclosing object reference> The non-static method makeInstance() at (3) in the class MyLinkedList creates an instance of the Node using the new operator, as shown at (4):
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return new Node(info, next); // (4)
This creates an instance of a non-static member class in the context of the instance of the enclosing class on which the makeInstance() method is invoked The new operator in the statement at (4) has an implicit this reference as the <enclosing object reference>, since the non-static member class is directly defined in the context of the object denoted by the this reference:
return thisnew Node(info, next); // (4')
The makeInstance() method is called at (14) This method call associates an inner object of the Node class with the object denoted by the reference list This inner object is denoted by the reference node1 This reference can then be used in the normal way to access members of the inner object An example of such a use is shown at (15) in the print statement where this reference is used to call the toString() method implicitly on the inner object