A PPT Presentation for java programing .pptx

Outer class in java

1. Java : Outer Class in Java A PPT PRESENTATION FOR JAVA PROGRMING

2. Outer Class An outer class in Java is a class that is not defined inside any other class. It is the top-level class that can contain fields, methods, constructors, nested classes, and inner classes. Every Java program starts with at least one outer class. Key points: Defined at the top level, outside of other classes. - Can be public or package-private. - Contains main() method in most programs. - Can include inner classes, but itself is the main container .

3. Basic Outer Class Example public class Car { String brand; int year; Car(String brand, int year) { this.brand = brand; this.year = year; } void display() { System.out.println ("Brand: " + brand + ", Year: " + year); } public static void main(String[] args ) { Car c = new Car("Toyota", 2022); c.display (); } } Example of a simple outer class with fields and methods

4. Outer Class with Inner Class public class University { String name = "ABC University"; class Department { String deptName ; Department(String deptName ) { this.deptName = deptName ; } void show() { System.out.println (name + " - Department: " + deptName ); } } public static void main(String[] args ) { University u = new University(); University.Department d = u.new Department("Computer Science"); d.show (); } } An outer class can contain an inner class. The inner class can access members of the outer class :

5. Outer Class with Static Nested Class A static nested class is defined inside an outer class but declared static. It does not require an instance of the outer class to be created. public class Library { // Static nested class static class Book { String title; Book(String title) { this.title = title; } void showTitle () { System.out.println ("Book: " + title); } } public static void main(String[] args ) { Library.Book b = new Library.Book ("Java Programming"); b.showTitle (); } }

6. MENTORSHIP:- PROF. SWETA KUMARI NAME : sushant gaurav BRANCH : CSE SEMESTER : 5 th ROLL NO. : 2023-CSE-53 INSTITUTE : GOVERNMENT POLYTECHNIC MUZFFARPUR PRESENTED BY :-

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