This document discusses Java programming and packages. It introduces Java, describes its key features like platform independence and object orientation. It then covers features of packages in Java like organization and reusability. It discusses standard Java packages like java.lang and java.io and how to create user-defined packages. The document also lists advantages like ease of learning and disadvantages like slow performance of Java. It concludes that Java allows type-safe programming but requires more expressive power.

1. www.oeclib.in
Submitted By:
Odisha Electronics Control Library
Seminar
On
Java

2. Content
 INTRODUCTION OF JAVA
 KEY FEATURES OF JAVA
 FEATURES OF PACKAGES
 STANDARD JAVA PACKAGES
 JAVA.LANG PACKAGE
 JAVA.IO PACKAGE
 CREATING A PACKAGE
 ADVANTAGES OF JAVA
 DISADVANTAGES OF JAVA
 CONCLUSIONS
 REFERENCES

3. INTRODUCTION OF JAVA
 Java is a programming language and environment
invented by James Gosling and others in 1994.
 Java was originaly named Oak and was developed as a
part of the Green project at the Sun Company.
 Java is an object-oriented programming language with a
built-in application programming interface (API) that
can handle graphics and user interfaces and that can be
used to create applications or applets.

4. KEY FEATURES OF JAVA
 Plateform Independence
 Encapsulation
 Dynamic binding
 Robust
 Distributed
 Portable
 Performance
 Multithreaded
 Interpreted & Compiler
 Architecture Neutral

5. FEATURES OF PACKAGES
 Package names can be used to identify your classes.
 Reusability of code is one of the most important
requirements in the software industry.
 Reusability saves time, effort and also ensures
consistency.
 In Java, the codes which can be reused by other
programs is put into a “Package”.
 A Package is a collection of classes, interfaces and/or
other packages.
 Packages are essentially a means of organizing classes
together as groups.

6. STANDARD JAVA PACKAGES

7. JAVA.LANG PACKAGE

8. JAVA.IO PACKAGE

9. CREATING A PACKAGE
 Java supports a keyword called “package” for creating
user-defined packages.
 The package statement must be the first statement in a
Java source file (except comments and white spaces)
followed by one or more classes.

10. ADVANTAGES OF JAVA
1.Java is easy to learn.
2.Java is object-oriented.
3.Java is platform-independent.
4.Java is distributed.
5.Java is secure.
6.Java is robust.
7.Java is multithreaded

11. DISADVANTAGES OF JAVA
 Slow
 Environment limitations
 Applet limitations imposed due to security model
 Uncertain status of security
 Programming language limitations
 Platform limitations
 General stability concerns

12. CONCLUSIONS
 Java offers the real possibility that most programs can
be written in a type-safe language.
 However, for Java to be broadly useful, it needs to have
more expressive power than it does at present.

13. REFERENCES
 www.google.com
 www.wikipedia.com
 www.oeclib.in

14. Thanks