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CHAPTER 1 Inside Java
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must be joined together to form the machine language program Programmers call joining object files linking Compiling and linking are important features of a high-level programming language because these two processes enable a program to run on different kinds of computers without the programmer having to rewrite the program This is made possible because there is a different compiler and linker for each kind of computer that is capable of translating a specific high-level programming language into machine language for a specific kind of computer For example, a program written in C++ can be compiled and linked so that it runs on different kinds of computers without having to be rewritten Here is the high-level programming language version of the assembly language example shown previously in this section:
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10 + 15
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In the Beginning
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In the 1950s, FORTRAN (FORmula TRANslator) and COBOL (COmmon Business Oriented Languages) were two popular high-level computer languages, and they re still in use today FORTRAN, developed by IBM, is a high-level programming language designed to perform complex mathematical computations for scientific and engineering applications COBOL, developed by the federal government, is designed to process and manipulate large amounts of data Although both of these languages achieved their objectives very well, they were not flexible and lacked the capabilities required to build compilers and operating systems Therefore, engineers sought to develop a more versatile high-level programming language, and by the late 1960s a new programming language was developed by Martin Richards It was called the BCPL programming language and was used to write compilers Soon after the introduction of BCPL, Ken Thompson developed an enhanced version of BCPL and called it the B programming language The B programming language was used to create the first versions of the Unix operating system at Bell Laboratories BCPL and the B programming languages had a major disadvantage in the way they used computer memory Today, computer memory is relatively inexpensive However, in the 1960s, computer memory was expensive, and both BCPL and B used computer memory inefficiently
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Java Demystified
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Think of computer memory as a bunch of boxes Each box can store one bottle of soda (data) You must reserve a box before you can store a bottle of soda in a box Therefore, it makes sense that you reserve ten boxes if you have to store ten bottles of soda and that you reserve five boxes if five bottles of soda are to be stored BCPL and B required that the same number of boxes be reserved regardless of the number of soda bottles being stored So, let s say that each time you wanted to store one soda bottle, you had to reserve ten boxes This meant that nine boxes went unused and were therefore wasted In 1972, Dennis Ritchie created the C programming language at Bell Laboratories It overcame the failings of BCPL and B The C programming language incorporated many of the features found in BCPL and B, plus it introduced new features that, among other things, enabled a programmer to specify exactly the amount of memory needed to store data in computer memory Although the C programming language addressed the drawbacks of BCPL and B, some programmers felt that it lacked the capability to mimic the way we look at the real world This is an important drawback because computer programs are designed to simulate the real word inside a computer Therefore, the C programming language couldn t simulate the real world to meet the desire of programmers We look at the real world as objects Those objects have attributes (data) and behaviors Take a window, for example The dimensions of the window are attributes Also, the window can be opened and closed, which are functionalities associated with a window The C programming language is a procedural language that is focused on mimicking real-world behavior inside a computer Unfortunately, the C programming language doesn t provide a way to combine behavior with attributes In 1980, Bjarne Stroustrup developed a new programming language at Bell Laboratories called C++ The most outstanding advancement of C++ was the capability to combine attributes and functionality into objects And with this came the growth of object-oriented design and object-oriented programming (see Object-Oriented Programming Demystified for more on this subject) You are probably wondering why Stroustrup used the ++ instead of coming up with a completely new name for the language The ++ is the incremental operator in C (and in Java), which you ll learn about later in this book For now, it is important to know that the incremental operator adds 1 to the current value C++ is said to increment the C programming language by incorporating all the features found in C and then adding new features Therefore, you can think of C++ as an extension of the C programming language
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