Java™ How to Program, Sixth Edition - Part2

Today i started reading Java™ How to Program, Sixth Edition By H. M. Deitel - Deitel & Associates, Inc., P. J. Deitel - Deitel & Associates, Inc.

Nice book written By H. M. Deitel - Deitel & Associates, Inc., P. J. Deitel - Deitel & Associates, Inc.

I wanted to share few quotations found the book from the 2nd chapter.

1) Every time you use a computer, you execute various applications that perform tasks for you. For example, your e-mail application helps you send and receive e-mail, and your Web browser lets you view Web pages from Web sites around the world. Computer programmers create such applications by writing computer programs.

2) A Java application is a computer program that executes when you use the java command to launch the Java Virtual Machine (JVM). Let us consider a simple application that displays a line of text.The output appears in the light blue box at the end of the program. The program illustrates several important Java language features. Java uses notations that may look strange to nonprogrammers.

3) Java also provides Javadoc comments that are delimited by /** and */. As with traditional comments, all text between the Javadoc comment delimiters is ignored by the compiler. Javadoc comments enable programmers to embed program documentation directly in their programs. Such comments are the preferred Java commenting format in industry. The javadoc utility program (part of the J2SE Development Kit) reads Javadoc comments and uses them to prepare your program's documentation in HTML format.

4) Method printf's first argument is a format string that may consist of fixed text and format specifiers. Fixed text is output by printf just as it would be output by print or println. Each format specifier is a placeholder for a value and specifies the type of data to output. Format specifiers also may include optional formatting information.

5) Using parentheses for complex arithmetic expressions, even when the parentheses are not necessary, can make the arithmetic expressions easier to read.

6) An if statement always begins with keyword if, followed by a condition in parentheses, and expects one statement in its body.

7) When we say that operators are applied from left to right, we are referring to their associativity. Some operators associate from right to left.

8) Most programs perform arithmetic calculations. The arithmetic operators are + (addition), - (subtraction, * (multiplication), / (division) and % (remainder).

9) The assignment operator, =, enables the program to give a value to a variable. Operator = is called a binary operator because it has two operands. A n assignment statement uses an assignment operator to assign a value to a variable.

10) A variable is a location in the computer's memory where a value can be stored for use later in a program. All variables must be declared with a name and a type before they can be used.

11) Java provides a rich set of predefined classes that programmers can reuse rather than "reinventing the wheel." These classes are grouped into packagesnamed collections of classes.

12) Computer programmers create applications by writing computer programs. A Java application is a computer program that executes when you use the java command to launch the JVM.


About the Authors

Dr. Harvey M. Deitel, Chairman and Chief Strategy Officer of Deitel & Associates, Inc., has 43 years experience in the computing field, including extensive industry and academic experience. Dr. Deitel earned B.S. and M.S. degrees from the Massachusetts Institute of Technology and a Ph.D. from Boston University. He worked on the pioneering virtual-memory operating-systems projects at IBM and MIT that developed techniques now widely implemented in systems such as UNIX, Linux and Windows XP. He has 20 years of college teaching experience, including earning tenure and serving as the Chairman of the Computer Science Department at Boston College before founding Deitel & Associates, Inc., with his son, Paul J. Deitel. He and Paul are the co-authors of several dozen books and multimedia packages and they are writing many more. With translations published in Japanese, German, Russian, Spanish, Traditional Chinese, Simplified Chinese, Korean, French, Polish, Italian, Portuguese, Greek, Urdu and Turkish, the Deitels' texts have earned international recognition. Dr. Deitel has delivered hundreds of professional seminars to major corporations, academic institutions, government organizations and the military.

Paul J. Deitel, CEO and Chief Technical Officer of Deitel & Associates, Inc., is a graduate of the MIT's Sloan School of Management, where he studied Information Technology. Through Deitel & Associates, Inc., he has delivered Java, C, C++, Internet and World Wide Web courses to industry clients, including IBM, Sun Microsystems, Dell, Lucent Technologies, Fidelity, NASA at the Kennedy Space Center, the National Severe Storm Laboratory, Compaq, White Sands Missile Range, Rogue Wave Software, Boeing, Stratus, Cambridge Technology Partners, Open Environment Corporation, One Wave, Hyperion Software, Adra Systems, Entergy, CableData Systems and many other organizations. Paul is one of the most experienced Java corporate trainers having taught about 100 professional Java training courses. He has also lectured on C++ and Java for the Boston Chapter of the Association for Computing Machinery. He and his father, Dr. Harvey M. Deitel, are the world's best-selling Computer Science textbook authors.