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Java technology is both platform and programming language.
· Java is Object Oriented Programming language.
· Java was developed by James Gosling and his team at Sun Microsystems lab.
· Initially called Oak, in honour of the tree outside Gosling's window, its name was changed to Java because there was already a language called Oak.
· Java word doesn't have specific meaning,it refers hot COFFEE.
· Coffee Cup is the icon of Java.
· Motivation behind developing Java
· Java platform was initially developed to address the problems of building software for networked consumer electronic devices e.g.Washing machine,Refrigerator.
· To meet that requirement compiled code has to be transported across networks and they should operate on any OS(Operating System).
· Before Java, the software for electronic devices was developed by C,C++ and these languages are platform dependent.
· So there was a requirement for platform-independentlanguage,that could be used to create software which can be used in any electroninc devices.
· At the same time World Wide Web was emerging in the market, So many CPUs of different environment was to be connected.
· So there was need for a platform independent & portable language.
· So that time only one solution was available JAVA formerly known as Oak.
· Features of Java
· Simple
· Object Oriented
· Multithreaded
· Portable
· Robust
· Secure
· Distributed
· Why to use Java
· Java is simple, easy to design , easy to write, and therefore easy to compile and debug.
· Java is object-oriented, that is used to build modular programs and reusable code in other application.
· Java is platform-independent and flexible in nature.
· Most significant feature of Java is to run a program easily from one computer system to another.
· Java works on distributed environment.
· Java is designed to work on distributed computing , any network programs in Java is same as sending and receiving data to and from a file. Java is secure.
· Java is secure.
· Java language, compiler, interpreter and runtime environment are secure.
· Java is robust.
· Java emphasis on checking for possible errors, as Java compilers are able to detect many error in program during the execution of respective program.
· Java supports multithreading.Multithread is the path of execution for a program to perform several tasks simultaneously within a program.
· Java come with the concept of Multithreaded Program.
· Why Java is not fully object oriented?
· It doesn't support Multiple inheritance.
· It allows use of primitive data types which are not an objects.
· It allows static methods to call without creating the instance.
· Few terminologies related to Java Language
· Source Code: Programme written by Developer according to the Java language syntax.
· Compiled Code:Compiler generated code that converted from source code.
· Compiler: It is programme that converts source code into machine language at once e.g JavaC
· Interpreter:It is programme that converts source code into machine language line by line e.g JIT(Just-in-Time)
· Abstract Window Toolkit (AWT):A collection of graphical user interface (GUI) components that were implemented using native-platform versions of the components.
· API:Application Programming Interface. The specification of how a programmer writing an application accesses the behaviour and state of classes and objects.
· Applet:A program written in the Java(TM) programming language to run within a web browser compatible with the Java platform, such as HotJava(TM) or Netscape Navigator(TM).
· ASCII:American Standard Code for Information Interchange. A standard assignment of 7-bit numeric codes to characters.
· Bean:A reusable software component. Beans can be combined to create an application.
· Casting:conversion from one data type to another.
· JDK:Java Development Kit
· JAR Files (.jar):Java ARchive. A file format used for aggregating many files into one.
· Java Application Environment (JAE):The source code release of the Java Development Kit (JDK(TM)) software.
· JRE:Java(TM) runtime environment.
· JVM:Java Virtual Machine.
Java technology is both platform and programming language.
· Java is Object Oriented Programming language.
· Java was developed by James Gosling and his team at Sun Microsystems lab.
· Initially called Oak, in honour of the tree outside Gosling's window, its name was changed to Java because there was already a language called Oak.
· Java word doesn't have specific meaning,it refers hot COFFEE.
· Coffee Cup is the icon of Java.
· Motivation behind developing Java
· Java platform was initially developed to address the problems of building software for networked consumer electronic devices e.g.Washing machine,Refrigerator.
· To meet that requirement compiled code has to be transported across networks and they should operate on any OS(Operating System).
· Before Java, the software for electronic devices was developed by C,C++ and these languages are platform dependent.
· So there was a requirement for platform-independentlanguage,that could be used to create software which can be used in any electroninc devices.
· At the same time World Wide Web was emerging in the market, So many CPUs of different environment was to be connected.
· So there was need for a platform independent & portable language.
· So that time only one solution was available JAVA formerly known as Oak.
· Features of Java
· Simple
· Object Oriented
· Multithreaded
· Portable
· Robust
· Secure
· Distributed
· Why to use Java
· Java is simple, easy to design , easy to write, and therefore easy to compile and debug.
· Java is object-oriented, that is used to build modular programs and reusable code in other application.
· Java is platform-independent and flexible in nature.
· Most significant feature of Java is to run a program easily from one computer system to another.
· Java works on distributed environment.
· Java is designed to work on distributed computing , any network programs in Java is same as sending and receiving data to and from a file. Java is secure.
· Java is secure.
· Java language, compiler, interpreter and runtime environment are secure.
· Java is robust.
· Java emphasis on checking for possible errors, as Java compilers are able to detect many error in program during the execution of respective program.
· Java supports multithreading.Multithread is the path of execution for a program to perform several tasks simultaneously within a program.
· Java come with the concept of Multithreaded Program.
· Why Java is not fully object oriented?
· It doesn't support Multiple inheritance.
· It allows use of primitive data types which are not an objects.
· It allows static methods to call without creating the instance.
· Few terminologies related to Java Language
· Source Code: Programme written by Developer according to the Java language syntax.
· Compiled Code:Compiler generated code that converted from source code.
· Compiler: It is programme that converts source code into machine language at once e.g JavaC
· Interpreter:It is programme that converts source code into machine language line by line e.g JIT(Just-in-Time)
· Abstract Window Toolkit (AWT):A collection of graphical user interface (GUI) components that were implemented using native-platform versions of the components.
· API:Application Programming Interface. The specification of how a programmer writing an application accesses the behaviour and state of classes and objects.
· Applet:A program written in the Java(TM) programming language to run within a web browser compatible with the Java platform, such as HotJava(TM) or Netscape Navigator(TM).
· ASCII:American Standard Code for Information Interchange. A standard assignment of 7-bit numeric codes to characters.
· Bean:A reusable software component. Beans can be combined to create an application.
· Casting:conversion from one data type to another.
· JDK:Java Development Kit
· JAR Files (.jar):Java ARchive. A file format used for aggregating many files into one.
· Java Application Environment (JAE):The source code release of the Java Development Kit (JDK(TM)) software.
· JRE:Java(TM) runtime environment.
· JVM:Java Virtual Machine.
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