the use of header files is to add functionality. Header files are basically saying put code in that header file here so you don't have to type that many lines of code.
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Because else you can't use the functions declared in that header file. E.g. we include stdio.h so we can use I/O functions, such as printf, putc and getch.
Java does not require header files like C/C++.
in the java as we use the inheritance property in the same way we can get the the inheritance property in c by using the prepared header files( .h files). there a single program in c use the many methods of many header files like math.h give us to use the use of floor(), sqrt() e.t.c. functions..
Java doesn't use header files.
A header file in C is used to import the features of parent classes in our class. The same feature is provided by the import statement in Java hence the header files are not used.
The need to declare header files is not compulsory in C++. You may place all your code in a single source file if you so desire. However, header files are useful in that they separate interface from implementation and aid in hiding information.