Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
In Java not all classes must be described separate from each other. You may put the definition of one class under the definition of another class. The class inside class is called an inner class and the enclosing class is called an outer class. So when you prepare an inner class, it is a member of the outer class in much the similar way as other members like attributes, constructors and methods.
Where should we need inner classes? Code without inner classes is hard to maintainable and readable. When you use private data members of the outer class, the JDK compiler provides package-access member functions in the outer class for the inner class to use the private members. That leaves a security hole. We could avoid it using inner classes. Use inner class only when an inner class is only in the context of the outer class and/or inner class may be prepared private so that only outer class can access it. Inner classes are needed primarily to implement helper classes like Comparators, Iterators etc which are needed in the context of an outer class.
Member inner class
Anonymous inner class
public class MyStack {
private Object[] items = null;
...
public Iterator iterator() {
return new StackIterator();
}
//inner class
class StackIterator implements Iterator{
public boolean hasNext(){...}
return new Iterator {
public boolean hasNext() {...}
Class Type
Description
Example +
Class name
Outer
class
Package
member class or interface
Top level class. Only type JVM
can access.
//package scope
class Outside{}
Outside.class
Inner
static nested
class or interface
Defined within the context of the
top-level class. Must be static & can access static members of its having class. No relationship between the instances of outside and Inside classes.
class Outside {
static class Inside{ }
Outside.class ,Outside$Inside.class
Member class
Defined within the context of
outer class, but non-static. Until an object of Outside class has
been started you can't create
Inside.
class Outside{
class Inside(){}
Outside.class , Outside$Inside.class
Local class
Defined within a part of code.
Can use final local variables and final method parameters. Only
visible within the part of code that defines it.
void first() {
final int i = 5;
class Inside{}
Outside.class , Outside$1$Inside.class
Anonymous
Just like local class, but no
name is used. Useful when only one instance is used in a
method. Most naturally used in
AWT/SWING event model, Spring framework hibernate call
back methods etc.
//AWT example
button.addActionListener ( new ActionListener()
{
public void actionPerformed(ActionEvent e) { System.out.println("The button was pressed!");
});
Outside.class , Outside$1.class
What are three ways in which a thread can enter the waiting state ?
How many iterations would this ‘for' loop run for? for ( x = 50 ; x document.write ( x ) ; } Answer: 50 iterations
A value, the data assigned to a variable, may contain any sort of data. Though, JavaScript considers data to fall into many possible types. Based on the type of data, certain opera
what is arrays and how do they operate
Test Driven Development (TDD) TDD process gives your confidence in the delivered code for the following things. 1. TDD can remove duplication of code and also disciplines t
Difference between URL instance and URL Connection instance? Ans) A URL instance shows the location of a resource, and a URL Connection instance shows a link for accessing or co
write a program in java which enters name,roll #,and shows the sum of students english and maths marks?
An aspect is the cross-cutting functionality that you are executing. It is the aspect of your application you are modularizing. An example of an aspect is logging. Logging is somet
You are to write two versions of this assignment. One using HTML and VBScript and one using HTML and Javascript. In both, you are to create an HTML webpage that: performs simple
Point-to-Point : gives a traditional queue based mechanism where the client application forwards a message through a queue to typically one receiving client that accepts messages
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd