Download Big Java. Compatible with Java 5, 6 and 7, 4th Edition by Cay S. Horstmann PDF

By Cay S. Horstmann

This ebook introduces programmers to things at a gentle speed. The syntax bins are revised to teach general code examples instead of summary notation. This contains non-compulsory instance modules utilizing Alice and Greenfoot. The examples characteristic annotations with dos and don'ts besides pass references to extra exact reasons within the textual content. New tables exhibit numerous regular and cautionary examples. New programming and evaluation difficulties also are offered that be certain a vast assurance of themes. moreover, Java 7 gains are incorporated to supply programmers with the main up to date info.

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Example text

Programs are sequences of instructions and decisions that the computer carries out to achieve a task. One program balances checkbooks; a different program, perhaps designed and constructed by a different company, processes words; and a third program, probably from yet another company, plays a game. Today’s computer programs are so sophisticated that it is hard to believe that they are all composed of extremely primitive operations. A typical operation may be one of the following: • • • • A computer program contains the instruction sequences for all tasks that it can execute.

Running your program takes two steps. ) The first step is to compile your program. The compiler translates the Java source code (that is, the statements that you wrote) into class files, which consist of virtual machine instructions and other information that is required for execution. class. class. Note that the compiler does not produce a class file if it has found erors in your program. The class file contains the translation of only the instructions that you wrote. That is not enough to actually run the program.

3 Translating Human-Readable Programs to Machine Code Generally, machine code depends on the CPU type. However, the instruction set of the Java virtual machine (JVM) can be executed on many CPUs. On the most basic level, computer instructions are extremely primitive. The processor executes machine instructions. CPUs from different vendors, such as the Intel Pentium or the Sun SPARC, have different sets of machine instructions. To enable Java applications to run on multiple CPUs without modification, Java programs contain machine instructions for a so-called “Java virtual machine” (JVM), an idealized CPU that is simulated by a program run on the actual CPU.

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