java theory problems

Question 12:    What is a source program?

Ans:

         The program  written in high level language is called source program or source code.

Question 13:      What is an interpreter? What is a compiler?

    Interpreter.

                  An interpreter is a software that convert high level language in low level language statement by statement. It is time consuming

  Compiler:

                  A compiler is a software that convert high level into low level language as whole.

Question 14:     What is a keyword? List some Java keywords.

    Keywords are reserved words that have predefine meaning and purpose.

 Key words:byte ,  short ,  int ,  float ,  char , String  ,Boolean , etc.