Implementing a Java Program

Implementing a Java Program

Creating a java program

Compiling a java program

Running the program

Creating a Java Program:

All java source file has an extension .java.

If a program contains multiple classes, the file name must 

be the class name of the class containing the main method.

 This class must be the only public class.

[Rule: File name should match the name of the public class

 of a source code.]

Implementing a Java Program

Compiling a Java Program:

üTo compile a java program, execute the java

 compiler javac, specifying the name of the source

 file on the command line.   C:\> javac 

Example.java

üWhen java source code is compiled, each 

individual class is put into it’s own output file

 named after the class and using the .class 

extension.

üEach file with .class extension contains the 

bytecode corresponding to that class.

üTo run the program, interpreter java is used the name of the

 class that contains the main function.

  c:\> java Example

üActually it searches for Example. class file.