Java is the general purpose, true object oriented programming language and is highly suitable for modeling the real Before the advent of event delegation model ,an event was propagated up String s="Welcome to javaTpoint "; byte b []=s
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Java is the general purpose, true object oriented programming language and is highly suitable for modeling the real Before the advent of event delegation model ,an event was propagated up String s="Welcome to javaTpoint "; byte b []=s
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HISTORY
Java is the general purpose, true object oriented programming language and is highly suitable for modeling the real world and solving the real world problems. In the company Sun Microsystem, James Goslings(an employee there), started a project his work by attempting to extend C++ features for developing embedded software for electronic companies to automate the electronic devices such as microwave. But this could not be accomplished by C++.So James Goslings started to d In may 1995,
Sun officially announced this language at Sunworld 95.Due to some reasons, the name was The prime motive of Java was the need for a platform independent language. The second motive wasThe mo
is not tied to any particular hardware or O.S.JAVA MILESTONES
YEAR DEVELOPMENT
1990 Sun Microsystem started to develop special software for electronic devices.
19911992 New language Oak was demonstrated in hand held devices.
1993 World Wide Web(WWW)appeared on internet and transformed the text based internet
to graphical environment. Sun developed Applets.1994 Green
1995 Oak was renamed to JAVA.
1996 Java established itself as the leader of internet programming. Sun released Java
development kit 1.0.1997 Sun released Java development kit 1.1(JDK 1.1).
1998 Sun released Java2 with version 1.2(SDK 1.2).
1999 Sun released Java2 standard edition (J2SE) and Enterprise Edition (J2EE).
2000 J2SE with SDK 1.3 was released.
2002 J2SE with SDK 1.4 was released.
2004 J2SE with JDK 5.0 was released.
CHARACTERISTICS OF JAVA
1. SIMPLE: Java was designed to be easy for the professional programmers to learn and
use effectively. Java uses C/C++ syntax. So, it is very simple to work in Java.2. OBJECT ORIENTED: Java is true object oriented language. Almost everything in Java
is an object. All program code and data reside within class and object. Java has a lot of classes arranged in packages that we can directly use in our programs.3. ROBUST AND SECURE: Java is a robust language. Here robust means, it provides
many safeguards to ensure reliable code. It has strict compile-time and run-time checking for data types. It also has the concept of exception handling to capture errors and remove the fear of crashing the system. Security is the major issue, when you work on internet.4. PLATEFORM INDEPENDENT AND PORTABLE: Java is portable that means Java
programs can be easily moved from one system to another, anywhere, anytime. Java ensures portability in two ways. First, Java compiler generates bytecode instructions that can be implemented on any machine. Second, the size of primitive data types are machine dependent. Java is platform independent that means changes and upgrades in operating system, processors and system resources will not force any change in java programs. This is why Java is famous for programming on internet which interconnects different kinds of system worldwide.5. COMPILED AND INTERPRETED: Usually, a language is either compiled or
interpreted. Java combines both the approaches. First, java compiler translates the source code into bytecode. Bytecode is intermediate form, not the machine instruction. In the second stage, Java interpreter translate this bytecode to the machine code, which can be directly executed by the machine that is running the Java program.6. MULTITHREADED AND INTERACTIVE: Multithreaded means handling multiple
tasks simultaneously. Java supports multithreading programming. For example: we can listen an audio while typing or scrolling a page. Java comes with tools that support multiprocess synchronization and construct smooth running interactive system.7. DISTRIBUTED: Java applications can open and access remote objects on internet as
they easily do in a local system. This enables multiple programmers at multiple remote locations to collaborate and work together on a single project.JAVA VIRTUAL MACHINE(JVM)
Java compiler translates the source code into intermediate code, known as byte code for a
Then the computer interpreter convert the intermediate code into red machine code and it makes --compiler---AE-interpreterAE For virtual machine For real machine All interpreters are different for different machines.JAVA DEVELOPMENT KIT:
Java development kit comes with a collection of tools used for developing and running java programs. They include-1. APPLET VIEWER: To view Java applets.
2. JAVAC: To compile the java programs.
3. JAVA: To run java programs (interpreter).
4. JAVAP: It is java deassembler, which converts bytecode files into program description.
5. JAVAH: It produces header files for use.
6. JAVADOC: It is used for HTML documents.
7. JDB: It is java program debugger.
API (APPLICATION PROGRAMMING INTERFACE)
API (Application programming interface) is a document that contains description of all the
features of a product or software. It represents classes and interfaces that software programs canfollow to communicate with each other. An API can be created for applications, libraries,
operating systems, etc. It is a java standard library. API includes hundreds of classes and methods grouped into several packages. Most common packages are: