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Inside this Book – Think about the CPU in your computer. No matter what make or model of CPU you own, it serves the same basic functions as any other CPU: it performs arithmetic calculations, controls access to memory, manages the flow of control of programs, and provides a way for programs to use hardware attached to the system. Even though all CPUs perform essentially the same job, programs designed for one CPU do not work on another. The developers of Java had a simple idea: design an abstraction of a CPU, and implement it for a variety of computers. Once this virtual computer is implemented on a particular system, all programs written for the virtual computer will run on that system. This allows programmers to write a program once, then run it anywhere. This virtual computer is called the Java virtual machine (JVM). Because the JVM isn’t biased toward any particular CPU, it can provide a more abstract view of memory. Instead of providing direct access to the bits-and-bytes level of memory, the JVM treats memory as a collection of objects. This is a paradigm called object-oriented programming, and it offers a number of advantages. One advantage is that it allows better control over which programs are allowed to access which parts of memory. This affords the JVM control over access to the hardware of the system. The JVM developers created a set of rules all programs must play by. As long as all programs play by the rules, it is possible to provide assurances to program users that the programs are not trying to damage the system.
Inside this book –Programming for the Java Virtual Machine PDF Book by Joshua Engel – When you write a program, you perform two basic tasks: you define your data structures, then define the operations to perform on the data. In the Java virtual machine, the fundamental unit of operation is the instruction, which causes the JVM to perform a simple operation such as adding two numbers or retrieving a value from the heap. Each instruction by itself performs only a tiny piece of an overall task. Instructions are collected into a unit called a method. The instructions in a method work together to perform a task such as multiplying matrices or drawing a three-dimensional figure on the screen. Methods may have just a few instructions or several thousand. A method has the ability to repeat parts of its code and skip over other parts. Many methods use other methods to assist in their task.
Programming for the Java Virtual Machine by Joshua Engel PDF : eBook Information
- Full Book Name – Programming for the Java Virtual Machine
- Author of this Book – Joshua Engel
- Language – English
- Book Genre – Computer Science, Programming
- Download Format – PDF
- Size – 3 MB
- eBook Pages – 517
- Price – Free