Structure of Java Program


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Structure of Java Program

Structure of a java program is the standard format released by Language developer to the Industry programmer.

Sun Micro System has prescribed the following structure for the java programmers for developing java application.

structure of java program
  • A package is a collection of classes, interfaces and sub-packages. A sub package contains collection of classes, interfaces and sub-sub packages etc. java.lang.*; package is imported by default and this package is known as default package.
  • Class is keyword used for developing user defined data type and every java program must start with a concept of class.
  • "ClassName" represent a java valid variable name treated as a name of the class each and every class name in java is treated as user-defined data type.
  • Data member represents either instance or static they will be selected based on the name of the class.
  • User-defined methods represents either instance or static they are meant for performing the operations either once or each and every time.
  • Each and every java program starts execution from the main() method. And hence main() method is known as program driver.
  • Since main() method of java is not returning any value and hence its return type must be void.
  • Since main() method of java executes only once throughout the java program execution and hence its nature must be static.
  • Since main() method must be accessed by every java programmer and hence whose access specifier must be public.
  • Each and every main() method of java must take array of objects of String.
  • Block of statements represents set of executable statements which are in term calling user-defined methods are containing business-logic.
  • The file naming conversion in the java programming is that which-ever class is containing main() method, that class name must be given as a file name with an extension .java.

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