Java Simple Introduce

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    Java is a object-oriented programming language which can write cross-platform application software. It was been launched in May 1995 by Sun Microsystems ,java is java programming language and java platform general term . Java technology has excellent versatility ,efficiency,platform portability and security ,it has been widely used in personal computer ,data center, game console, science super computers ,mobile phones and the Internet ,also it has the world's largest developer of professional community . In the industry environment of cloud computing and mobile internet around the world ,java own a significant advantages and broad prospects .

     .Java be developed by James Gosling and his colleagues , was launched in 1995 . Java is divided into three systems javaSE ,javaEE, javaME . Different from the traditional program ,java as an open technology be launched by Sun . The worldwide java developer companies was asked to design java software must be compatible with each other .

      Java basic grammer

      When writing java program ,you should pay attention to the following :

          1, Case sensitive :java is case sensitive ,this means that the identifier "Hello" and "hello" is different .

          2, Class name: For all classes ,the class name of the first letter should be capitalized .If the composition of the class name consist of several words ,then the first letter of each word should be capitalized . For example :MyFirstJavaClass .

          3, Method name:All method names should begin with lowercase letter . If method names contains several words , then the first letter of other words should be capitalized . For example: getAge()

          4,The source file name: The source name must be same as the class name , when save the file ,you should use the class name as the file name to save (be careful case sensitive) ,the filename suffix is .java .

          5, Main method entry: All java program started by the method :public static void main(String args[])